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VOL. 83 



The telson is longer than the last abdominal somite and somewhat 

 shorter than the penultimate. On either side it carries three or four 

 spines. The somewhat produced posterior angle of each of the two 

 anal flaps is armed with a long bristlelike spine. 



The antennule is long and slender and exceeds the tip of the 

 pseudorostrum by the greater part of the last joint of its peduncle. 



FiGCRB 39. — Oxyurostylis paciflca, new species, female with brood pouch : o, Lateral view, 

 X 13 ; b, anterior end of body from above, X 13 ; c, posterior end, X 33. (Magnifica- 

 tions approximate.) 



The first pereiopod is long and slender and exceeds the tip of the 

 pseudorostrum by a little more than its last two joints. Of the last 

 three joints, the penultimate is the longest, the antepenultimate is 

 somewhat shorter, and the last is only a little more than half as long 

 as the penultimate. 



The peduncle of the uropod exceeds the tip of the telson by almost 

 one-third of its length. On its inner margin there are about 16 fine 

 spines. The exopod is about as long as the endopod and attains al- 

 most half of the length of the peduncle. Of the three joints of the 

 endopod, the first is the longest, the last is somewhat shorter, and 

 the middle one slightly shorter yet. On the inner margin of the 

 three joints there are, respectively, 4, 3, and 3 spinas. 



Length. — About 7 mm. 



Occurrence. — Between Balboa and Corona Del Mar, Calif., 7-15 

 fathoms, March and May 1933 (no. 28), two females with brood 

 pouches, one the holotype (U.S.N.M. no. 71442), accompanied by 

 two specimens of Cmnpylaspis canaliculata. 



RcTnarks. — The species differs so fundamentally from O. smithi, 

 the heretofore unique representative of the genus, that there is no 

 possibility of confusing the two. 



