814 ON THE CHv$:TOSOJ\IATID^ . 



Fit,', lr^ — Latero-ventral view of the posterior end of a male specimen, 

 siiowing the arrangement of the four rows of ventral setie, and the 

 character of the striated cuticle; ( x 520). 



Plate xlv. — -Ch. falcatum, sp.n., ?. 

 Fig. 2. — 8ide-view of a whole mount; (x240). The structure of the in- 

 ternal organs is not clearly visible through the thick cuticle. 

 Fig.2a. — Posterior end of a female specimen, seen from the side; ( x 520). 

 Fig. 2/). — A compound seta; ( x about 2000). 



Plate xlvi. — Ch. hasiceUi, sp.n., J . 

 Surface- view, from the side, of a whole male specimen; ( x 240). The verj' 

 fine striations on the cuticle are only indicated in places. 



Plate xlvii. — Ch. hasiceUi, sp.n., ? ; ( x 240). 



Fig. 4rt , — Sagittal, longitudinal section through anterior and middle region 

 of body, showing alimentary and genital systems. The bod3^-wall 

 has been crushed out of its normal position during the process of 

 embedding and section-cutting, so that the ctelome is almost ob- 

 obliterated, and the section is narrower than the true width oi the 

 animal. The posterior end is cut out, and hairs and other delicate 

 external structures do not show in a mount in Cana 1 ' balsam. 



Fig. 4/). — Whole mount of an immature specimen, with only a single row 

 of dorsal seta?, and three pairs of ventral setffi. 



Fig. 4c. — Anterior end of specimen shown in Fig.46. 



Plate xlviii. — Notodui'tosoma tenax, gen. et sp.n., i . 

 Side-view of a whole mount, ( x 240), showing the character of the thick, 

 striated cuticle, and other external features. The sharp curvatuie 

 at the anterior end is more pronounced in this specimen than is 

 usually the case. Plate xlix. shows the more normal curvature. 



Plate xlix. — A", tenax, n.sp., ? ; ( x 240). 

 Side-view of a whole mount, with the cuticle drawn onl^' in outline, and 

 the internal structure shown. 



Plate 1. — X. cryptocephalum, n.sp., i . 

 A whole mount, ( x 240). The posterior end was broken oti' during mount- 

 ing, and is shown separated from the rest of the body. The strong, 

 broadly ringed cuticle does not permit of a clear view of the internal 

 structure. 



