12 



MARINE ISOPODS FROM THE PHILIPPINE ISLANDS. 



a larger one posterior to them. The first pair of antennae have the first two articles 

 rather large and dilated, the second article being somewhat smaller than the first; the 

 third article is about as long as the first two articles taken together. The flagellum is 

 composed of eight articles and extends to the middle of the last article of the peduncle 

 of the second antennae. The second pair of antennae have the first three articles of the 

 peduncle short and subequal; the last two are subequal in length and each is about 

 as long as the first three taken together. The peduncle extends to the posterior margin 

 of the head. The flagellum is composed of thirteen articles on one side and nineteen 

 on the other and extends to the posterior margin of the first thoracic segment. 



First and fourth segments of thorax each 3 mm. long; second, third, and sixth seg- 

 ments each 2.5 mm. in length; fifth segment 3.5 mm.; seventh segment 1,5 mm. 

 Epimera present on all the segments except the first. The first two are long and nar- 

 row, with rounded extremities, and do not extend beyond the posterior margin of the 

 segments; the last four have the posterior extremities acutely produced and extending 

 beyond the postlateral angles of the segments, the last three being more acute and 

 longer than the preceding. All are furnished with a longitudinal 

 carina, and there is also a carina on the lateral margins of the 

 first thoracic segment. 



The first segment of the abdomen is partly covered by the 

 seventh thoracic segment; the second, third, and fourth segments 

 are subequal in length, each being 1-.5 mm. long; the fifth seg- 

 ment is 2 mm. long in the middle portion; the terminal segment 

 is triangulate, but the tip is broken, so that its exact shape is 

 questionable. The branches of the uropoda 

 are equal in length; the outer is long and nar- 

 row with the extremity narrowly rounded. 

 The inner has a rather deep emargination on 

 the exterior margin about two-thirds the length 

 of the branch. The peduncle of the uropoda 

 is produced in an acute process which extends 

 to the emargination of the inner branch. 



The first pair of prehensile legs have four 

 spines on the merus, the second have six 

 spines on the merus and one at the distal 

 extremity of the ischium, the third pair have 

 seven spines on the merus and two on the ischium at the distal extremity. 



Only one specimen, a female, comes from station 5173, Jolo Light, N. 82° E., '6.75 

 mi. (6° 02 / 55" N., 120° 53' 00" E.). Depth, 186 fathoms, in shells and coral. Cata- 

 logue number 40912, United States National Museum. 



The shape of the abdomen and uropoda somewhat resemble Pseudxga punctata 

 Thomson^ but the eyes and antennae are totally different. 



Fig. 11. 



Maxilliped. 

 -JEga excisa. X M 



ZEga dubia, sp. nov. 



Body of female oblong-ovate, more than three times longer than wide, 6 mm.: 19 

 mm. Color yellow, with numerous black and brown arborescent spots close together 

 and covering the entire surface of the body except the posterior half of the terminal 

 segment of the abdomen and the uropoda. 



Head twice as wide as long, 2 mm. : 4 mm., with the anterior margin widely rounded. 

 Eyes large, meeting in the middle of the head and covering the entire dorsal surface, 

 with the exception of a small V-shaped place in front, and extending under on the 

 ventral side as far as the mouth parts. The first pair of antennae have the first two 



a Trans. N. Zeal. Inst., vol. xvi, 1883, p. 234. 



