38 The Mickoscope. 



having the hairs on the back short and of the same length, but unless 

 I have made a mistake in the identification, the cuticular appendao-es 

 should be called sj^ines, and they are sometimes longer posteriorly 

 than elsewhere. They are often independently curved, and some- 

 what scattered out of the usual longitudinal arrangement, so that the 

 animal then has an untidy, dishevelled and disreputable appearance. 

 The spines arise by enlarged bases directly from the cuticular surface 

 withoiit the intervention of scales. They are very unevenly furcate,, 

 one branch being very small, often scarcely more than a minute 

 linear jirojection. The oral annulus is beaded. The space between 

 the bands of ventral cilia is densely clothed with short, hispid, 

 recurved setae, two or more long fine hairs projecting' beyond the 

 posterior border. The animal is about y|-^ inch long. The egg I 

 have not seen. 



10. Chcetonotus squamatus, Duj. 



In Dujardin's description, he says that this Chsetonotus is 

 clothed on the back with short hairs basally enlarged into pointed, 

 regularly imbricated scales. Seen from above, it appears to be cov- 

 ered by them transversely, so as to form seven longitudinal rows, but 

 when examined in profile the scales are seen to be the bases of so 

 many short hairs covering the entire back and even both branches 

 of the posterior bifurcation. I am not sure that any form that has 

 come beneath my notice could be identified with this; certainly none 

 could if in these days of fine objectives Dujardin's statement holds 

 geod that the hairs or spines can only be seen when the animal is 

 examined laterally. In a single instance a Chsetonotus that may 

 have been Ch. squamatus was observed momentarily and was lost 

 before it could be properly examined. 



11. Chmtonotus larus, Ehr. — Plate I, fig. 11. 



The back and sides are clothed with longitudinal rows of shorty 

 conical spines, sometimes, always, according to Ehrenberg's descrip- 

 tion, longest posteriorly. The oral annulus is not beaded, but the 

 oral cilia project beyond the margin in a single setose series. The 

 arrangement of the ventral cilia varies in different individuals, per- 

 haps in those from different localities. In the majority of those seen 

 by me the cilia are in two longitudinal, lateral bands; in a few cases 

 the entire antero- ventral surface for a space equaling the length of 

 the oesophagus, was entirely ciliated, the cilia being continued as two 

 bands extending to the caudal bifurcation, and as two narrow central 

 lines visible for the same distance. The animal is usually described 

 as having four lines of ventral cilia. 



