52 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Especial Diagnostic Characters. The presence of two kinds of slightly elevated 
tubercles on the cuticle: tubercles of greater diameter with smooth summit, a 
few of which have an apical clear spot ; and tubercles of smaller diameter and 
usually less elevation, the surface of which is not smooth, but with more or less 
numerous conical or spiniform short processes, 
Comparisons. This species is more closely allied to C. gordioides than to 
any other, but differs from it in the following points : the presence of tubercles 
whose surface bears short processes, the presence of clear spots on the surface of 
some of the smooth tubercles, and the absence of groups of inter-tubercular 
hairs ; there are also differences in coloration, such as the absence of a black 
ring around the mouth aperture, and the much darker color of the body. 
17. C. cubanensis, n. sp. 
Figs. 118-123, Plato 15. 
(Type of Female : Harvard coll. 1466, Cuba. Type of Male: Harvard coll. 
1466 d, Cuba.) 
Form of Male. Body nearly cylindrical, without well marked median 
grooves; anterior end slightly attenuated. Head (Fig. 123) very narrow, 
truncated apically, slightly concave on the terminal aspect; on the ventral 
surface alone is there a constriction separating the head from the body. Pos- 
terior end (Fig. 122) flattened on the ventral surface, with a median groove 
behind the cloacal aperture ; this groove is broadest and deepest at the ventro- 
terminal point of the body; just behind the cloacal aperture is a transverse 
semilunar ridge. 
Form of Female. Larger and more robust than the male, the shape of the 
anterior portion of the body otherwise similar. Head (Fig. 120) rounded at 
the apex, mouth nearer the ventral than the dorsal margin of the head. Pos- 
terior portion of the body (Fig. 121) narrower than the middle, but the 
extreme distal end is swollen, and of greater diameter than the part immedi- 
ately preceding. This posterior end is obliquely truncated, the dorso-terminal 
margin projecting farther caudad than the ventro-terminal; the swelling is. 
most pronounced on the ventral side. 
Cuticle (Fig. 119). With papille of three kinds, besides hyaline processes ; 
though it is difficult to distinguish sharply between these kinds since they 
seem to intergrade. The hyaline processes have the same form as in most 
other species of the genus, and are slender club-shaped processes, slightly 
swollen and rounded at the apex ; they are about the height of: the highest 
papille. lst Kind of Papille: The smallest, least elevated, and most numer- 
ous of all occur close together between the groups of larger papillae, and also 
in the latter groups. They are pyramidal or somewhat elongate-conical on 
lateral view, pointed at the apex which bears a single (rarely two) long, deli- 
cate, usually curved spine; this spine is thickest at the base and sometimes 
recurved at the tip. A. modification of these tubercles attains nearly the height 
of the largest papilla. 2d Kind of Papillæ: These, the second in point of 
