CALIFORNIA CUMACEA — ZIMMER 



437 



FiGUKE 38. — Diastylopsis tenuis, new species, fe- 

 male with brood pouch : a, Anterior end of 

 body, lateral view, X 9 ; &, posterior end, X 25. 

 (Magnifications approximate.) 



dentiform. (The first two pairs of pereiopods of either side in all 

 the specimens were incomplete.) 



The uropod-peduncle is only a little longer than the last abdominal 

 somite and extends beyond the telson by about a third only of its 

 own length, not by half of its length as in dawsoni. The siibequal 

 branches attain about two-thirds the length of the peduncle, not, as 

 in dawsoni, a good half of the peduncle length. There are fewer 

 spines on the inner margin of the peduncle and endopod than in 

 dmvsoni 



Length. — The female with brood pouch is about 9 mm, whereas in 

 daivsoni the length of the adult female is about 14.5 mm. 



Occui'i'eyice. — Off Corona 

 Del Mar, Calif., 20 fath- 

 oms, summer of 1933 (no. 

 26), an adult female and 

 three females with brood 

 pouches, one the holotype 

 (U.S.N.M. no. 71441). 



Remarks. — Beneath the 

 chitin of the carapace and 

 also at intervals in other 

 parts of the body a distinc- 

 tive structural peculiarity 

 is manifest in the shape of more or less numerous, chiefly circular, 

 strongly refractive flecks of varying size, which at times may co- 

 alesce to form larger irregular areas. I consider this phenomenon 

 here to be an artificial condition resulting from the method of pres- 

 ervation employed. 



Genus OXYUROSTYLIS Caiman 



OXYUROSTYLIS PACIFICA, new species 

 FiGUKE 39 



Female with hrood poiich. — The thoracic portion of the body is 

 almost as long as the abdominal, the telson excepted. Seen from 

 above, the carapace narrows anteriorly more regularly and evenly 

 than in the typical species, smithi Caiman. The subrostral notch is 

 more developed than in smithi. The subrostral angle is rounded. 

 The surface of the carapace and of the free thoracic sternites is rough, 

 being thickly beset with very fine denticles. Only the anterior por- 

 tion of the ps€udorostral lobes is free of them. Two somewhat 

 stronger denticles stand side by side in front on the ocular lobe. Two 

 oblique impressions extend over the frontal lobe, so that in lateral 

 view two steplike offsets are apparent. These, together with the fine 

 denticulation of the carapace, make it appear as if there are two 

 oblique rows of denticles on the frontal lobe. 



