772 



ON THE ClI.iiTOSOMATlD.d!], 



detail by De Man (12), for several species of these genera, e.g.^ 

 Eiwjylus communis, in the male of which are found, " between 

 the anus and the aperture of the accessory organ, eighteen seta^ 

 on each side of the ventral middle line." 



In the adult female, the trunk is circular in cross-section in 

 front (Text fig. 5), slightly flattened dorso-ventrally into a more 



oval form in tl 



le re'aon 



of the genital organs (Text-fig 20), and 



posteriorly is broadly ovate (Text-fig. If) \ 

 lying between the ventral locomotor setae. 



the narrowest part 

 The cuticle, which 



Lm,b 



vmh. 



FtpJ 



Figs. 4, o. — (Jh. falcatum 



Fig. 4. — Transverse section through head in the region of the anterior 

 pharjaigeal hiilb; ( x 610^. 



Fig.o. — T.8. through anterior part of trunk of same specimen; ( x 610); 

 hyp., hypodermis; v.r., subcuticular laj'er of bodj'-wall ; l.m.h., 

 lateral mesodermal hand; //. , glandular masses round pharjaix. 



forms the external covering of the body, is structureless, and 

 quite homogeneous. It forms a relatively broad layer (0*004 mm., 

 in a worm which has an average diameter of 0048 mm.), and is 

 of uniform thickness throughout (Text-figs. 5-8, c?a^.). Beneath 

 the cuticle is a much narrower layer (s.c. ), in which it is impos- 

 sible to make out any definite structure. It is strongly refrac- 

 tive, and appears bright yellow in sections stained with heema- 

 toxylin and eosin. Its internal outline is very irregular, both 



