C.'^IFORNIA CUMACEA — ZIMMER 435 



longer than the last somite. In addition to two terminal spines, it 

 carries on either side of its postanal portion about five fairly long 

 lateral spines. 



The carpus of the first pereiopod is noticeably shorter than the 

 propodus and the latter is clearly shorter than the dactyl. 



The peduncle of the uropod is about twice as long as the telson. 

 The exopod is clearly shorter than the telson and the endopod is 

 somewhat shorter than the exopod. The three joints of the endopod 

 are successively somewhat shorter from first to last. The spines on 

 the inner side of the peduncle and endopod are w^eaker but more 

 numerous than in the female. 



The integument of the male is also roughened but not so much as 

 in the female. 



Length. — About 12 mm. 



Oecvirrence. — Between Balboa and Corona Del Mar, Calif,, 10-67 

 fathoms, November 25, 1932, to July 1, 1933 (no. 27), three females, 

 one the holotype (U.S.N.M. no. 71440), with brood pouch, and two 

 adults in poor condition and incomplete; off Balboa, Calif., 66 fath- 

 oms, March 17, 1933 (no. 29), a male in nuptial dress; off Balboa, 

 between 15 and 66 fathoms, April 10, 1933 (no. 34), one male in 

 nuptial dress. 



Remarks. — The peculiar sculpturing of the carapace in both sexes 

 distinguishes this new species from all other representatives of the 

 family. In the form of its telson it shows certain relationships to 

 the genus M akrokylindi^us ; both have an almost cylindrical preanal 

 portion distinctly longer than the postanal, which carries a few or 

 no lateral spines. In species of Makrokylindrtis, however, the telson 

 is longer than the peduncle of the uropod, or at least nearly as long 

 (with the exception of M. acanthodes Stebbing). Furthermore, a 

 more or less thick armament of the carapace is the rule among these 

 sjoecies, and spines exist at least on the pseudorostrum, especially on 

 its anterior portion. In the species before us the carapace is indeed 

 roughened with fine granulations or tiny denticles, but on its pseu- 

 dorostrum this roughness is least developed and is practically lack- 

 ing on its anterior portions. Since to me the relationship with 

 Makrokylindrus appears slight, I have refrained from placing this 

 new species in Makrokylindrus^ as I at first had tentatively intended. 



A similar form of the telson also occurs in the genus Paradiastylis, 

 but here, too, no closer relationship is indicated, for the male in 

 nuptial dress lacks the strikingly widened base of the pereiopods, 

 which is so characteristic of Paradiastylis and Di7norphostylis. 



