MONTGOMERY: GORDIACEA. 47 
in Mexico, Peru, and Bolivia. It appears to have a very extensive range, and 
it and G. aquaticus robustus are the most abundant forms in the northeastern 
portion of the United States. 
Genus CHORDODES (Creplin) Mobius. 
13, C. morgani, n. sp. 
Fig. 94, Plate 12; Figs. 95-100, Plate 13. 
(1 female, type, in my possession, from Maryland; a second female from 
Iowa in the Harvard coll. no. 1470.) 
Description of the Type Specimen. Form: Perfectly cylindrical without 
median lines, Anterior end gradually attenuated, head (Fig. 98) much nar- 
rower than the posterior end, rounded. Tail end (Fig. 97) swollen, obtuse 
posteriorly, the swelling most pronounced on the ventral aspect. Cuticle: 
With three kinds of prominences (Figs. 99, 100): (1) Larger tubercles which 
are about twice as high as broad, nearly circular on cross section, and rounded 
apically; these bear no hairs, and are distributed at nearly equal distances on 
the surface of the cuticle, with only a slight tendency to arrange themselves 
into disjointed groups. (2) Smaller tubercles, which are pointed at the apex 
and more or less conical in form; these vary considerably in height, but are 
never more than a quarter the height of the preceding kind. Each bears on its 
summit a single delicate hair. These tubercles are arranged quite densely on 
the surface of the cuticle, and the larger ones among them are grouped closely 
around the tubercles of the Ist order; in the median line of the body they are 
more numerous, especially the larger ones of them, which form groups be- 
tween as well as around the tubercles of the 1st order. (3) Delicate slender 
hyaline processes, frequently club-shaped, which occur only sparsely, and are a 
little higher than the first kind of tubercles. Color: A uniform yellowish 
brown. Dimensions: length, 222 mm. ; greatest diameter of body, 1.1 mm. 
Description of the Second Specimen. Form: Anterior end pointed, and head 
tip (Fig. 94) rounded as in the preceding, but on the ventral surface of the 
head, to each side of the median line, is a short longitudinal groove. Body 
nearly cylindrical, with narrow but deep median grooves; on a portion of 
the surface there are likewise irregular longitudinal grooves. Posterior end 
(Figs. 95, 96) swollen, though of less diameter than the body at its middle 
point; this distal swelling is of greater diameter than the dorso-ventrally 
flattened portion of the body which immediately precedes it. The posterior 
end is truncated terminally, and near the centre of this terminal aspect 
(Fig. 96) is situated the cloacal aperture at the middle point of a vertical 
ridge, to each side of which is a groove. On the dorso-lateral sides of the 
posterior end larger and deeper grooves are situated. Color; A uniform dull 
chocolate-brown, the terminal aspect of the head somewhat lighter in color. 
