244 



TROCHELMINTHES 



3. IcHTHYDiUM Ehrenberg. Like Chcetonotus except that the back 

 is bare: several species. 



I. podura (0. F. Miiller) (Fig. 400). A pair of vertical spines on 

 the neck, and another pair near the hinder end ; length .07 mm. : common. 



Fig. 399 



Fig. 400 



Fig. 401 



Fig. 399 — Lepidoderma rJiomhoides (Siissw. F. Deut.). A, iioad ; B, tail; C, dorsal 



scales. Fig. 400 — Ichthydium podura (Siissw. F. Deut.). 



Fig. 401 — Dasydytes saltitans (Stokes). 



4. Dasydytes Gosse. Body wide, with a distinct neck and head and 

 no forked tail: several species. 



D. saltitans Stokes (Fig. 401). Head with long cilia on both sides; 

 neck very flexible; 2 sets of long bristles cross each other on the back; 

 length .08 mm. : not common. 



Fig. 402 

 Echinoderes 



dujardini 

 (from Claus). 



Class 3. KINORHYNCHA.* 



Minute marine worms less than .5 mm. in length; 

 body arched dorsally and concave ventrally, and composed 

 of a series of rmgs; body cavity not segmented; outer sur- 

 face not ciliated but provided with spines and bristles ; head 

 and neck retractile, with a ring of hooks around the 

 mouth and a number of long locomotory spines; hinder 

 end usually forked; paired genital pores and paired 

 excretoi-y pores near hinder end; sexes separate: about 30 

 species. 



Family ECHINODEEIDAE. 



With the characters given above: 2 genera. 



Echinoderes Dujardin. Eyes present: several species in the 

 Mediterranean and Atlantic. 



E. dujardini Claparede (Fig. 402). Body composed of 13 rings; 2 

 red eyes; color reddish: in mud and on algae. 



* See "Zur Kenntniss der Echinoderen," by C. Zeliuka, Zool. Anz., Vol. 32, p. 130, 



1908. 



