318 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
This species, which seems to be w*ell founded, is so briefly described 
by Verrill,— who had but a single specimen,— that I venture to 
give a fuller description based upon the considerable amount of 
material at my disposal. 
Trunk broad, not tapering markedly posteriorly ; anterior border 
with a rather elongate conical tubercle, tipped with a short spine at 
each side of the eye tubercle; segmentation suppressed. Lateral 
processes closely appressed, larger distally, their outer ends giving 
a broadly elliptical outline to the body ; nearly unarmed, but the 
first pair may bear one or two tubercles similar to those on the 
anterior border of the trunk. 
Caudal segment short, slightly elevated, barely reaching to 
posterior edge of first coxal joint of fourth pair of legs ; not marked 
off from trunk by a distinct suture ; tapering more or less evenly, 
or slightly fusiform ; slightly bilobed at tip. Armed with a short 
spine on each side at a little distance from the tip. 
Eye tubercle situated at extreme anterior end of trunk, low, 
obtusely conical or dome-shaped, directed somewhat anteriorly 
when seen from the side (pi. 21, fig. 5) ; seen from in front or 
from behind (pi. 21, fig. 13) it is obtuse at the tip owing to a small 
projection on each side. Eyes moderately large, dark brown. 
Proboscis rather long, about equal in length to trunk (pi. 21, fig- 5), 
but arising so far under the first trunk segment that when viewed from 
above much of its base is hidden and it has the appearance of being 
much shorter than it really is, and of being evenly tapering (pi. 21, 
fig. 4). In reality it is fusiform, being broadest at its proximal third, 
and tapering in both directions from this point. Its dorsal curvature 
is considerably more convex than the ventral outline. There is no 
evidence of the circular constriction which is found in several 
species of this genus. 
Chelifori short, scarcely equaling a fourth of the proboscis ; also 
arising from beneath the anterior edge of the trunk, so that when 
seen from above they appear even shorter than they really are. 
Basal joint about twice as long as broad, bowed slightly outward, 
somewhat larger distally; second segment small, globular, with a 
distinct dorso-ventral groove dividing the distal part into two sub¬ 
equal lobes, which are the vestiges of larval chelae. The chelifori 
bear a few very small scattering spines, and there is a slightly larger 
one constantly on the outer side of the larger lobe of the second joint. 
