MUSEUM OF COMPARATIVE ZOOLOGY. 99 
merus; carpus short. Ambulatory legs (Pl. IV. Fig. 2 a), well armed with 
spines. 
First segment of pleon small, nearly concealed by the last thoracic segment, 
and usually surpassed by the last pair of epimera, narrower than the three 
following segments, which are slightly broader than the last thoracic seg- 
ment without the epimera. Last segment broader than long, rounded and 
ciliated behind, faintly furrowed on the median line posteriorly. Uropods 
about equal to the telson ; basal segment more or less produced at the inter- 
nal angle, outer ramus shorter than the inner, both rounded behind and 
ciliated, denticulated externally, with short spinules in the notches between 
the teeth. 
The female specimens vary in length from 14 mm. to 25 mm. and in breadth 
from 6 mm. to 10 mm., being mostly slightly broader in proportion than the 
type specimen, which is 26.5 mm. long, 10 mm. broad, The large male in the 
Blake Collection is 28 mm. long, 12 mm. broad; the small female, 17.5 mm. 
by 7mm. A Male collected by the U.S. Fish Commission at Station 871 is 
22 mm. long, 9.5 mm. broad. 
The typical specimen of this species is destitute of color markings, which 
may however have faded out from exposure to the light. Nearly all the other 
specimens are rather distinctly marked, chiefly along the sides of the body, 
with dark brown, arranged as follows. The lateral margins of the first thoracic 
segment, and the epimera sometimes of the third, and usually of the fourth, 
fifth, and sixth segments, but not of the seventh, are dark or nearly black, and 
the color extends distinctly to the adjacent regions of the fourth segment, and 
may extend across the back along the hinder margin of this segment ; the 
next two segments may be similarly, but less strongly marked. On the pleon 
the color appears as a curved or crescentic band, along the lateral margins of 
the second, third, and fourth segments, and across the back part of the fifth and 
fore part of the sixth segments. On the sixth segment the color when present 
is divided by the median line into two more or less distinct spots, or macule. 
The posterior part of the telson is lighter-colored than the body. 
This species has also been obtained by the U. S. Fish Commission at the fol- 
lowing stations: — 
Station, Fathoms N. Lat. W. Long. Specimens. 
871 115 40° 2! 54” 70° 23/ 40” 5 
874 85 40° 0’ 70° 57’ Cast skin. 
875 126 39° 57’ 70° 57’ 30” 1 
897 157 37° 25/ 74° 18’ 2 
1108 101 40° Q 70° 37’ 30” 1 
Oct. 4, 1882 Trawl-line 1 
Rocinela sp. 
A single specimen, probably of an undescribed species of this genus, was ob- 
tained at Station 344, Lat. 40° 1’ N., Long. 70° 58’ W., from 129 fathoms. 
