MONTGOMERY: GORDIACEA. 51 
Posterior end of the body is nearly cylindrical, somewhat flattened ventrally, 
and terminally either rounded or obliquely truncated. On the medio-ventral 
surface of the posterior end (Figs. 112, 113, a, 6) is a shallow groove, which 
extends from the cloacal aperture caudad to.the distal end of the body, and to 
each side of this groove is a longitudinal ridge of slight elevation. 
Cuticle. On surface view (in Canada balsam) two kinds of low, flattened 
tubercles or areoles are to be seen (Figs. 115, 117): (1) The larger (those of 
greater diameter) are darker in color, and either elongate (in one specimen) or 
rounded-polygonal in outline. In the median line of the body they are smaller 
and more densely arranged than elsewhere. In one specimen (the type, Fig. 
115) these areoles were non-confluent ; but in the other they show a tendency 
to group themselves in interrupted, transverse rows, and consequently are 
more elongate in form than in the former (type) specimen. On the surface of 
some.of the larger areoles is seen a small, circular clear spot, in the centre of 
which appears a small granule ; sections show that this spot is a pit on the 
surface of the tubercle, which is nearly filled with a small rounded-conical 
process ; those tubercles on the lateral surfaces of the body which contain such 
clear spots, and they are few in number, are usually dumbbell-shaped in outline, 
and their clear spots are smaller than those of the median tubercles, in which 
they occur more frequently. (2) Smaller, lighter colored tubercles, much 
more variable in form and size than the preceding, and which are irregularly 
arranged between the former kind. In one of the specimens a system of oblique 
lines is seen on the surface of the cuticle, and these lines are peculiar in that 
they do not lie between rows of areoles, but appear to run. right across their 
surface (Fig. 117). 
On transverse section of the cuticle two kinds of tubercles are seen, corre- 
sponding to the two kinds seen on surface views (Fig. 116): (1) Low tuber- 
cles of greater diameter, which are flattened apically, and have no projections. 
(2) Tubereles of smaller diameter, very irregular in form, and usually of 
slightly less elevation than the preceding; these correspond to the smaller, 
lighter tubercles seen on surface views. The apex of these is not flattened, but 
more or less irregularly rounded ; from the summit project upwards short 
conical or spiniform processes, which are exceedingly variable in form, some- 
times cleft or pectinate terminally, though most of them are largest at the base 
and pointed at the apex. Rarely is there only a single process to a tubercle : 
as a rule there are a number, and on the tubercles of the dorso-median line of 
the body they are more numerous than elsewhere. In addition to these two 
kinds of tubercles are seen on sections, though only sparsely, hyaline club- 
shaped processes. 
Color of type specimen : black, at the anterior end of the body with a 
reddish tinge ; the tip of the head yellowish white. The second specimen was 
of a deep rufous-brown color, lighter at the anterior tip of the body, and 
blackish at the posterior end, 
Dimensions. Length of larger individual (type), 255 mm.; greatest diameter, 
1,5 mm. 
