396 History of the Hairy-backed Animalcules. 



end of which seem thickened and are bent downwards. Oval 

 clear specks, one on each side of the face, may be eyes. (See 

 Fig. 5.) 



The manners were much like those of the rest of the genus. 

 It was restless, crawling impatiently among the little masses of 

 sediment, frequently turning itself double, and sometimes coil- 

 ing almost into a circle ; perpetually shortening and lengthen- 

 ing the head, protruding the mouth, and searching with the 

 fore part, like a caterpillar. It sometimes swam briskly. 



A much smaller individual, from the same dyke, had the 

 bristles much fewer ; they were, however, very coarse, and 

 rigid and curved. A row of fine close-set vibrating cilia run 

 along the side besides the bristles. I think it was a young one 

 of the same species. 



In a specimen recently dead, and lying on its side, I saw 

 the lateral form of the mouth, and the traces of tooth-like strias 

 that surround it. I saw no bristles along the belly line, but 

 they covered the whole sides. Certain irregular lines may pos- 

 sibly have been folds of the skin. The intestine was decurved, 

 and terminated considerably short of the fork ; it appeared to 

 have a distinct portion at its anterior end, separated by a dia- 

 phragm. The toes were decurved. I did not notice the pecu- 

 liar structure of the bristles observed by Schulze, but cannot 

 affirm that it was not present. 



Sp.4. C. brevis (Ehr.). This is characterized by its minute 

 dimensions, being only 1 -430th of an inch in length, and by 

 its having several eggs developed simultaneously, which are 

 proportionally smaller. A doubtful species, and one which has 

 not, I believe, been recognized by any other observer. 



Sp. 5. C. squammatus {Duj.) (PL i. Fig. 6.) Tho hairs 

 enlarged in the manner of scales, regularly imbricated, distin- 

 guish this species. M. Dujardin found it in January 1840, in 

 a bottle of fresh water which ho had kept for more than a year, 

 having brought it originally from Paris to Toulouse.* On tho 

 upper surface it appears clothed with scales ranged in seven 

 longitudinal rows, but on a sido view these are seen to be tho 

 basea of short hairs which cover all tho back, and even the 

 forked foot. Tho mouth appeared surrounded by four or fivo 

 papillae, only occasionally visible. The vibratory cilia of tho 

 ventral surface are very long, especially on the anterior 

 portion. 



In 1850 I found what I prosmno to bo this species, in a 

 tub of water exposed in my garden for tho propagation of Roti- 

 fera. A description, made at tho time, without any knowledge 

 of Dnjardin'fl observations, I subjoin. Length l-170th of an 



* Pritchard (lnfus. 4th Ed. p. G62) by mistake says " tea water from Tou- 

 louse." 



