Vol. 3] Jnday. — Ostracoda of the San Diego Region. 141 



to those of the joints ; this tapers down to a small anniilated 

 portion. 



The mandible is without a masticatinj2r process. The vermi- 

 form limb bears very few setae, usually four terminal and four 

 lateral. The caudal lamina has eleven claws, four of which are 

 long and more or less pectinate at the base ; the two terminal 

 claws are longest and strongest, above them is a small claw, then 

 a long one, followed by another short one which is, in turn, fol- 

 lowed by another long one ; the five upper ones^ are small. 



Length 1.9 ; height 1.0 mm. 



Catch 124, 6 miles off whistling buoy, San Diego, June 24, 

 1904, surface. 



Catch 221, 6 miles off Point Loma, July 23, 1904, surface tow 

 at night. 



Philomedes lomae nov. sp. 



PL 19, figs. 1-6. 



Male. — Shell rather strongly calcareous and firm ; greatest 

 height a little behind the middle ; dorsal margin more strongly 

 arched than the ventral ; at the postero-dorsal angle a blunt pro- 

 cess arises a short distance in front of the margin of each valve 

 and extends backward beyond the margin, thus forming a projec- 

 tion at this angle; a large blunt projection at the postero-ventral 

 angle; rostral process broad and blunt; antennal sinus distinct 

 but broad and shallow^; sinus narrower and more pronounced in 

 young specimens ; a small rib-like ridge posteriorly a short dis- 

 tance above the ventral margin and another just below the dorsal 

 margin. Shell densely pitted with small foveolae; transparent 

 margin of moderate width and densely ciliated. 



Third joint of antennule sub-triangular, closely jointed to the 

 fourth ; the outer extremity of the fourth bears a sensory appen- 

 dage which has a tuft of cilia a short distance beyond the base ; 

 the two elongated setae borne by the last joint are about one and 

 a half times as long as the entire limb. Frontal organ long and 

 slender, two-jointed ; first joint enlarged at the base, second form- 

 ing a long, slender capitulum. 



Antenna. — First joint of swimming branch elongated, cylin- 

 drical; second short, bearing a medium sized, non-plumose seta 



