No. 1633. 



SOME NEW ATLANTIC ISOPODA — RICHARDSON. 



85 



Fig. 20. — E u r y - 



COPE TRUNCATA 



X141. 



rostrum the frontal margin has a double excavation ; the antero-lateral 

 angles are acute. The eyes are absent, The first pair of antennae have 

 the basal article large and armed with one long 

 spine; the two following articles are subequal in 

 length and are small; the flagellum Is lost in the 

 only specimen. The first article of the peduncle 

 of the second antennae is short, and is furnished 

 on the outer margin with a single spine ; the sec- 

 ond article is a little longer than the first and is 

 unarmed; the third article is a little longer than 

 the second and is armed with two spines, one on the 

 outer and one on the inner margin ; the antennae are 

 broken at the end of the fourth article. 



The first segment of the thorax has the antero- 

 lateral angles produced in one long spine on either 

 side, directed anteriorly ; the second segment has the 

 lateral margin produced in one long anterior spine 

 directed anteriorly and one small posterior one on 

 either side ; the third and fourth segments have the 

 lateral margin produced on either side in three spines, two small ones 

 on either side of one long one directed ante- 

 riorly ; the last three segments have the lateral 

 margins produced on either side in a single long 

 spine, directed anteriorly in the fifth and sixth 

 segments and a little posteriorly in the seventh 

 segment. 



The abdomen has the lateral margin pro- 

 duced on either side at the base in one long- 

 spine directed a little posteriorly; below these 

 spines, the lateral margins are nearly parallel 

 to about the middle of the segment, where there 

 is an abrupt incision; below this incision is a 

 single long spine, directed posteriorly; below 

 these spines the lateral margins of the segment 

 converge slightly to a truncate extremity. The 

 uropoda have the basal article short ; the inner 

 branch is about twice as long as the basal 

 article; the outer branch is a little more than 

 half the length of the inner branch. 



The first four segments of the thorax are 

 each armed on the dorsal surface in the median 

 longitudinal line with a single spine on the 

 anterior margin, the spine on the fourth segment being the longest 

 and very prominent; on the three following segments there are two 



Fig. 21. — Eurycope mag- 

 nispinis. 



