No. 1633. SOME WW ATLANTIC I80PODA— RICHARDSON. 



85 



Pig. -2tK — Euet- 



COP K TRUNCATA 



X14*. 



rostrum the frontal margin lias a double excavation : the antero-lateral 



angles air acute. The eyes are absent. The iirst 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 iirst 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 antenna' 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. — Ecrycofe mag- 



xi spin is. 



