Vol. 3] Juday. — Ostracoda of the San Diego Region. 21 



The anteiinule bears a long-^ curved terminal seta and four 

 sensory ones, the former about two and a half times as long' as 

 the latter ; the long seta is armed with some spinules on its ven- 

 tral margin in the middle third. The principal seta of the sec- 

 ondary branch of the antenna is about a fourth longer than the 

 longest of the four adjacent setae. 



Length 2.4 ; greatest height 1.4 mm. 



Male. — Capitulum of frontal organ shorter than in female, 

 broadly club-shaped, irregularly armed with spinous hairs; ter- 

 minal seta of antennule bearing about twenty pairs of slender, 

 thickly set spines, and not longer than the two neighboring setae ; 

 proximal sensory seta thick and very long, almost as long as the 

 antenna ; hooked appendage of secondary branch of right an- 

 tenna bent into a right angle at the base. 



Length: one male was obtained which measured 2.9 mm. 



Distribution : Ischia, Orotava, and Atlantic Ocean, lat. 34° 

 18'' N., long. 15° 34' W. (Claus) ; Pacific Ocean off San Diego, 

 California. 



4. Conchoecia pacifica no v. nom. 



PI. IV, figs. 5-7 ; pi. V, figs. 1,2. 



1890. Conchcecia oblonga, Miiller, G. W., p. 272, pi. XXVIII, figs. 26, 31, 

 32, 36, 37. 



Shell elongated, a little more than twice as long as high; 

 somewhat higher behind than in front; postero-dorsal angle 

 acute, with a blunt point which is a little larger on the right 

 valve than on the left. Shell sculpture limited to a pair of striae 

 near the ventral and posterior margins which run parallel to the 

 margins ; these striae scarcely noticeable in the female, more dis- 

 tinct in the male. Rostrum prominent, bent downward; rostral 

 sinus rather narrow and deep. 



In the male the outside of the shell bears a number of hair- 

 like processes, some of which are tolerably long; a row of about 

 six or eight of these on either valve a short distance in front of 

 the posterior margin. These hair-like processes are fewer and 

 shorter on the shell of the female. 



In the male the shell has a reddish-orange color in the foUow- 

 ino' regions: Edges of valves from anterior margin of hinge 



