MONTGOMERY: GORDIACEA. 49 
Color. A more or less deep chocolate-brown, somewhat lighter on the 
anterior end; head (not merely its terminal tip) almost white. 
Dimensions. Length of the larger individual, 212 mm. ; greatest diameter of 
body, 1 mm. 
Especial Diagnostic Characters. The three kinds of minute papillæ, which 
are not arranged into particular groups, furnish the chief diagnostic character, 
Comparisons. This species differs in the characters of its cuticle from all 
foreign species of the genus. These characters appear to resemble those de- 
scribed by Camerano (?97, b) for C. talensis ; but the description of this author 
is difficult to understand, and is without figures, so that it seems justifiable to 
class our species as new, at least until further descriptions and figures of 
talensis are published. 
15. C. gordioides, n. sp. 
Figs, 106, 107, Plate 13; Figs. 108-110, Plate 14. 
(Types, males and 1 female: coll. Acad. Nat. Sci. Phila., Hayden’s Survey, 
S. Montana.) 
Form of Male. Anterior end slender, cylindrical, attenuated, head (Fig. 108) 
somewhat conical with obtusely truncated tip; mouth terminal. Body for 
the most part cylindrical, without well marked median grooves; thickest in 
the posterior fourth. Posterior end, for the distance of 10 mm., consider- 
ably narrower than the immediately preceding portion, and slightly flat- 
tened dorso-ventrally. Cloacal aperture on the ventral surface (Fig. 110), 
anterior to the posterior tip of the body; just anterior to this aperture is a 
slightly elevated semilunar ridge. In the medio-ventral line of the body, 
behind the cloacal aperture, is a shallow groove, to each side of which is a 
longitudinal prominence. The posterior end of the body is rounded termi- 
nally. 
Form of Female. General form as in the male, the body thickest in the mid- 
dle, narrowed anteriorly, more or less flattened posteriorly. Posterior end 
(Fig. 109, a, b) enlarged, somewhat spherical, constricted off from the imme- 
diately preceding portion of the body; cloacal aperture terminal, nearer the 
dorsal than the ventral side. 
Cuticle. With low flattened tubercles, but little higher than the areole of 
Gordius densareolatus. On surface views (Fig. 107) these appear small, ovoid 
or rounded-polygonal in outline, but they vary considerably in shape and some- 
what in size, and are often much elongated. They have a tendency to arrange 
themselves into parallel rows, contiguous rows being well separated from one 
another; the direction of these rows is slightly oblique to the transverse axis of 
the body, and their component tubercles are more or less confluent. Light 
colored lines also are seen on the surface of the cuticle, the distances which sepa- 
rate these lines being variable; these lines, the optical representations of shallow 
grooves, demarcate rhomb-shaped portions of the cuticle, On cross sections 
(Fig. 106) the tubercles are seen to be low, and usually flattened apically, with 
