searle: isopoda. 363 



the second and third, wliich are about the same lcn<;th. Tlie first 

 segment is 2| mm. long, the second and third each 2 mm. and the 

 fourtli 3 mm. The fifth segment is longest, being 4 mm.; the sixth 

 is 3^ mm. and the seventh is 2| mm. The epimera are small, narrow 

 plates, extending almost the entire length of the second thoracic 

 segment, al)out 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 witle, being 5 mm. 

 long. : about 3| mm. wide. The branches of the uropoda are subec^ual 

 in width and length and extend to the extremity of the terminal 

 abdominal segment. They are oar-like in shape. 



Locality. — Only one specimen, a female, was taken between the 

 Galapagos Islands and Manga Reva at Station 4722, in lat. 9° 31' N., 

 long. 10()° 30' 5" W. at a depth of 1,923 fathoms on a rocky bottom. 



Ty^c— 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 

 4,040, 4,657, 4,596, 4,730 and Butaritari, Gilbert Group Lagoon. 

 Surface. 



Nerocila excisa, sp. nov. 



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 j^air of antennae, composed of seven 



Fig. 4. — Nerocila excisa. Head and first three thoracic segments. 8. X 

 Fig. 5. — Nerocila excisa. Lateral view of thorax. 8. X 



articles, extend to the anterolateral angles of the first thorjicic segment. 

 Second pair of antenna,e, composec] of seven articles, are eqiuil in 



