SEARLE: ISOPODA. 363 
the second and third, which are about the same length. The first 
segment is 25 rim. long, the second and third each 2 mm. and the 
fourth 3mm. The fifth segment is longest, being 4 mm.; the sixth 
is 34 mm. and the seventh is 2; mm. The epimera are small, narrow 
plates, extending almost the entire length of the second thoracic 
segment, about two thirds the length of the third segment and half the 
length of the fourth, fifth, and sixth segments. In the seventh seg- 
ment the epimera extend two thirds the length of the segment. 
The first five segments of the abdomen are subequal in length, but 
gradually decrease in width to the terminal segment, which is lingui- 
form in shape. The last segment is longer than wide, being 5 mm. 
long.: about 3; mm. wide. The branches of the uropoda are subequal 
in width and length and extend to the extremity of the terminal 
abdominal segment. They are oar-like in shape. 
 Loeality— Only one specimen, a female, was taken between the 
Galapagos Islands and Manga Reva at Station 4722, in lat. 9° 31’ N., 
long. 106° 30’ 5’ W. at a depth of 1,923 fathoms on a rocky bottom. 
Type.— Cat. No. 46,440, U.S. N. M. 
This species differs from all the others of the genus in the longer 
second antennae, which extend to the posterior margin of the second 
thoracic segment. 
A number of immature forms of Cymothoidae come from Stations 
4,640, 4,657, 4,596, 4,730 and Butaritari, Gilbert Group Lagoon. 
Surface. 
NEROCILA EXCISA, sp. nov. 
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| Body oblong-ovate. 
_ Head broader posteriorly than anteriorly, with the front slightly 
excavate in the middle. Eyes irregular in shape and placed in the 
postlateral angles. First pair of antennae, composed of seven 
| os 
| <7 
r 
| Fig. 4.— Nerocila excisa. Head and first three thoracic segments. 8. X 
/ Pig. 5.— Nerocila excisa. Lateral view of thorax. 8. X 
! . 
Me extend to the anterolateral angles of the first thoracic segment. 
second pair of antennae, composed of seven articles, are equal in 
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