280 H. Richardson — Isopods of the Bermudas. 



Family Apseudidee. 

 Apseudes triangulata Richardson, sp. nov. 



Plate XXXVII. Figures 1-5. 



Body narrow, elongated, surface smooth. 



Head with frontal margin produced at the middle in a rostrum 

 like a spear point, whose sides near the base are excavated below the 

 lateral expansion of the rostrum. On either side of the excavation 

 thus formed the margin is acutely produced in a small anterior pro- 

 cess. Lateral to this process is the ocular process, which is pro- 

 duced anteriorly about the same distance. The eyes are distinct 

 and black and occupy almost the whole surface of the ocular lobe. 



The first pair of antennae have the first joint of the peduncle long, 

 the inner lateral margin of which is armed with three long spines 

 and one small one ; the outer margin, with one large spine near the 

 apex. The second joint is one-third the length of the first joint and 

 is unarmed. The third joint is one-half as long as the second joint. 

 The flagellum is composed of about fourteen joints ; the secondary 

 appendage of about seven joints. The peduncle of the second pair 

 of antenna? extends to the end of the first joint of the peduncle of 

 the first pair, and has an exopod developed at the base of the third 

 joint. The flagellum is composed of about ten joints, and extends 

 about half the length of the flagellum of the first pair of antenna?. 

 There is a prominent spine on the epistoma. 



The first free segment of the thorax is shortest, the two following 

 ones being longer, the next two the longest, and the last but little 

 longer than the first. The first segment is as wide as the head, the 

 others decrease in width gradually. The anterolateral margins of 

 all the segments except the first are produced into one acute process, 

 of the fourth and fifth free segments into two acute processes. The 

 last segment bears a ventral spine. 



The abdominal segments gradually decrease in width backwards. 

 The sixth or terminal segment is produced on either side near the 

 base into two acute processes. Beyond the last process the segment 

 widens slightly for the attachment of the uropoda, and ends pos- 

 teriorly in a triangular process. The uropoda are very long, the 

 inner branch being half the length of the body, and composed of 

 about twenty-five joints. The outer branch is composed of seven 

 joints. 



First gnathopods with the upper distal margin of the propodus, 

 finely serrate and armed with a tooth near the articulation of the 



