Vol. 3] Juday. — Osfracoda of the San Diego Region. 19 



The longer of the two setae on the basal joint of the second- 

 ary branch of the female antenna armed with fine, short hairs, 

 and in the male bearing two long hair-like processes; in the 

 female four of the five setae of the last two joints nearly equal 

 in length, the fifth a little longer. Hooked appendage of second- 

 ary branch of right male antenna strongly angnlated near base 

 and again broadly curved towards distal end; that of left side 

 with only a bend near the base. 



The spines of the caudal laminae curved only towards the 

 points ; the last four very small. 



Length: female 1.1-1.4; male 1.0-1.1; height 0.55-0.66 mm. 



Distribution. Mediterranean (Claus) ; Adriatic, Gulf of Na- 

 ples (Miiller) ; Pacific Ocean off San Diego, California. 



2. Conchoecia magna Claus. 



PI. Ill, figs. 8-11; pi. IV, figs. 1, 2. 



1874. Conclicecia magna, Claus, p. G, pi. I, fig. Gc ; pi. II, figs. 16, 18. 

 1887. Conchoecia tetragona, Sars, p. 82, pi. XI, figs. 5, 6; pi. XIII, figs. 5-9. 



1890. Conchoecia tetragona, Miiller, G. W., p. 274, pi. XXVIII, figs. 28, 29, 



33, 34, 39, 40. 



1891. Conchoecia magna, Claus, p. 57, pi. II; pi. Ill, figs. 1, 2. 



1894. Concho'cia magna, Miiller, G. W., p. 228, pi. V, figs. 7-12, 16-22, 27- 



31,_ 35-39, 45-52. 

 1896. Conchoecia magna, Brady and Norman, p. 687, pi. LXII, figs. 5-13. 



Shell elongated, subquadrangular, slightly higher behind than 

 in front ; length about twice the height ; dorsal margin with de- 

 pression near the middle ; anterior margin evenly curved, round- 

 ing off gradually into the ventral margin ; the latter slightly 

 sinuous in the middle and posteriorly curved over rather ab- 

 ruptly into the posterior margin ; postero-dorsal angle obtuse ; 

 in the male the rostrum is stout and blunt, Mdiile in the female 

 it is slenderer and bent downward more strongly. The striatious 

 of the shell are very obscure, most of them running parallel to 

 the dorsal and ventral margins; posteriorly two or three striae 

 run parallel to the posterior margin, and anteriorly below the 

 rostral sinus they run parallel to the curved antero-ventral mar- 

 "in ; anteriorlv some of the striae branch and anastomose. 



