16 



MARINE ISOPODS FROM THE PHILIPPINE ISLANDS. 



having the outer postlateral angle produced in an acute point, the posterior margin 

 below rounded - the epimera of the last four segments become gradually more acute and 

 more produced beyond the postlateral angles of the segments. 

 All are furnished with an obliquely longitudinal carina. 



The first segment of the abdomen is partly covered by the 

 last thoracic segment; the three following segments are sub- 

 equal and each is 2 mm. long; the fifth segment is a little 

 longer than any of the preceding ones, being 2.5 mm. in 

 length. The sixth or terminal segment is a little wider than 

 long, 10 mm.: 12 mm. (including the median terminal tooth). 

 The sides gradually converge to the posterior extremity, 

 which is 5 mm. wide. The posterior margin is produced in 

 three long acute teeth, the median tooth being 2 mm. long, the 

 lateral teeth each 1 mm. The outer branch of the uropoda is 

 shorter and narrower than the inner branch and is posteriorly 

 acute; the inner branch has the outer postlateral angle acutely 

 produced, the inner rounded. The inner branch does not 

 quite reach the extremity of the median tooth of the terminal 

 abdominal segment. ' 



The first three pairs of legs are prehensile, the last four pairs 

 ambulatory. 



A single specimen was obtained, at station 5626, between 

 Fig. u.—sEga antennata. Grillolo and Kayoa Island, at a depth of 265 fathoms. Type, 

 X l|. catalogue number 41014, United States National Museum. 



2Ega acuticauda, sp. nov. 



Body oblong-ovate, almost three times as long as wide, 11 mm.: 31 mm. Surface 

 punctate. Color yellow. 



Head more than twice as wide as long, 2.5 mm.: 5.5 mm. Anterior margin pro- 

 duced in a small acute median point, on either side of which is a rather deep excava- 

 tion for the reception of the basal article of the first antennae. The eyes are large, 

 composite, oval, 1.5 mm. wide and 2.5 mm. long and separated at 

 the anterior extremity by a distance of 1.5 mm. The first pair of 

 antennas have the first two articles short, the first about 1.5 times 

 longer than the second and also wider; the third article is long 

 and slender, a little longer than the first two taken together, and 

 extends to the end of the fourth article of the peduncle of the 

 second antennas. The flagellum is composed of eleven articles 

 and extends a little beyond the peduncle of the second antennas 

 and a little beyond the postlateral angle of the head. The second 

 antennas with a flagellum of thirteen articles, extend to the pos- 

 terior margin of the first thoracic segment. 



The first, second, and seventh segments of the thorax are sub- 

 equal, each being 2 mm. long; the second is 1.5 mm. in length; 

 the fourth, fifth, and sixth are each 3 mm. long. Epimera are 

 present on all the segments except the first, those of the second 

 and third segments not extending beyond the posterior margins of 

 the segments, while those of the last four segments are acutely p IGt 15 _^ r/a acuti- 

 produced beyond the postlateral angles of the segments, each cauda. x lj. 

 having two obliquely longitudinal carinas. 



The first five segments of the abdomen are short and subequal, each being about 

 1.5 mm. long, the first being partly covered by the last thoracic segment. The sixth 

 or terminal segment is 6.5 mm. long : 8 mm. wide at the base, and has three teeth 

 on the posterior margin, the median one being acute, the two lateral ones obtuse, 

 and shorter than the median tooth. The uropoda are about as long as the terminal 

 abdominal segment. The inner branch is wide and has the outer postlateral angle 



