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Page 72 text:
INDEX. CHAETONOTUS LARUS EHR., magnified 750 diameters. I, as seen from above; 2, as seen upon the side, without the side spines. yNohc 012 SI aehoDoha lai a ' SOME years ago I made a careful study of the microscopic forms occur- ring in the fresh-water streams, ponds, and other sources of water- supply in and about Orono, Me. Among the animals observed was Chaetofiotus larus EJir., which occurred in considerable abundance, and which appears to be equally abundant in the streams and ponds about Amherst. The descriptions and figures of this animal, given by Ehrenberg, Dujar- din, and in the Micrographic Dictionary, are superficial and unsatisfactory. To gain a more complete insight into the structure of this animal, I spent soine time in the study of its anatomy and habits. Chactonotus larus is very common in the fine debris over the bot- tom of ponds, streams, and springs, as well as in decomposing vegetable matters in watering-troughs and in cisterns which have no filters. I have found it at all seasons of the year, even in midwinter, in springs which are frozen over. 46.
Page 71 text:
INDEX. May 20. Scrub Artillery Drill.— Prex acting as No. i, with sponge staft " in one hand and a lantern in the other. Shimer, No. 2, standing guard over the linch-i in of one wheel. Watson standing guard over another linch-pin, but in making an about-face, loses sight of the linch-pin forever. Chorus of unnecessary remarks from outside parties. But then, they got the feed. " 27. Professors all mad about something. Prof. W. : " You had the best railroad curve under me, when you fell down stairs the other morning. " Lieut. S. : " Be careful, boys, not to let that trail fall on to you, or you will very quickly become a burnt sacrifice. " " 29. Freshmen all broken up. Just home from a tear. (Mountain day.) Prof. W., to students : " Gentlemen, the time was up, but I do not call it a fair bolt, because you passed me on the stairs. " " Cooley was the false prophet and he had a few followers. "
Page 73 text:
INDEX. These animals are about one two hundred and twentj-fifth of an inch long, oblong, rounded above, somewhat enlarged posteriorly, and armed on their upper surface with spines curving backward, those on the posterior part being the largest. The under surface is flat, and without spines, but with four longitudinal bands of cilia. Upon the head are four colorless eyes, or what appear to be eyes, and also four clusters of long, fine hairs starting out near the eyes, but a little below them. These appear to be tactile organs, as they keep them in constant motion, apparently feeling around as they move about slowly among the debris. The posterior end of the animal is bifid, ending in two tapering caudal appendages, which are quite flexible, each being composed of two segments, and with the tips slightly expanded into a disk. In the basal portion of each caudal appendage is a gland, with a duct leading from it, and opening at the end of the appendage in the center of the disk. From the movements of the animal I conclude that the disk serves as a sucker, and also that the secretion from this gland is adhesive in its nature; for, except when swimming, they stick the caudal append- ages to any convenient object and hold themselves in place, or swing them- selves to one side or the other, as they may desire. The mouth opens on the under side, close to the anterior part of the body, through a more or less hardened ring, and the oesophagus passes up vertically about one third of the distance from the mouth to the top of the head, where it turns sharply up and back at an angle of about 45° for about the same distance, when it turns again and runs horizontally toward the posterior end for about one third the length of the animal, when it expands into an oesophageal bulb. This opens into a straight intestine, which runs through to the anus between the caudal appendages. The oesophagus is surrounded by a thick, dense, muscular tissue of circular fibers, and the intestine is surrounded by a layer of large nucleated cells, outside of which is another layer of much smaller ones, which are more difficult to make out. Directly above the oesophagus is a globular bpdy or cavity, but I cannot conjecture what its functions are. In the median line, above the intestine, is situated the ovary, in which is developed but one g , at a time. This Q g is very large as compared with the size of the animal itself. The nucleus is plainly- visible even before the discharge of the egg from the ovary. The oviduct is easily traced to the outlet immediately above the anus. I have watched the development of the eggs many times ; and the young, when nearly ready to hatch, are of the same form and structure as the adult, but doubled up within the shell. I have also seen all sizes, from those just hatched up to the adult ; and though for want of assistance I have never been able to trace the entire development of one individual through, I have no doubt that these animals are never parasitic, and that they do not pass through any alternation of generations.
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