no.1653. PACIFIC COAST C0PEP0D8 -WILSON. 451 



turn, by Doctor McClendon ;ii La Jolla, California. These are the 

 types of the new genus and species and arc Cat. No. 38596, I'.S.N.M. 



Female.- -Carapace subquadrangular, slightly swollen at the center, 

 with the corners nearly square. Frontal plate- so thoroughly fused 

 with the carapace as to be indistinguishable in the adult, their an- 

 terior margin entire and only slightly rounded, with no trace <>t' a 

 centra] sinus. 



Posterior margin of carapace evenly rounded with a slight incision 

 at the center. Lateral areas narrow as in Echthrogah us, with a trans- 

 verse groove back of the center: posterior lobes short, not reaching 

 beyond the posterior margin and bluntly rounded. 



Second and third thorax segments fused and covered with a single 

 pair of dorsal plates; these latter are fused at their base, l>ul separated 

 for tlu 1 terminal three- fourths by a wide triangular sinus. Fourth 

 segmenl free and furnished with a pair of dorsal plates very similar 

 to the previous pair, but the central sinus separating them is con- 

 siderably enlarged at the base. 



Genital segment the same width as the two pairs of dorsal plates, 

 a little longer than wide, with nearly parallel sides. It- posterior 

 margin i- rather evenly rounded and is divided at the center by a 

 wide and deep sinus, very similar to that in Perissopus. 



Abdomen one-jointed and triangular much wider than long, with 

 a narrow slit-like posterior sinus. The wide and flattened anal lamina; 

 are attached to the inclined margins on either side of this sinus and 

 some distance apart: each i- armed with live short, nonplumose seta?. 



The first antenna? are slender, the two joint- of about the same 

 length and well armed with seta-. The second pair are stout, with 

 a swollen basal joint and a large terminal (daw bent in the form of a 

 half circle. 



Mouth tube long and narrow, lance-shaped as in Pandarus and 

 allied genera. No first maxilla?; second pair close to the base of 

 the mouth tube, two-jointed and both joint-- swollen, the terminal 

 one ellipsoidal, considerably narrower than the basal, and lipped 

 with a short curved spine. On either side of the mouth tube at 

 its tip is a large boot-shaped spine, like those found in the same 

 position on Echthrogaleus torpedinis. 



First maxillipeds of the usual pattern: second pair similar to 

 those of Pandarus, with a swollen basal joint and a -lout, curved 

 terminal claw which shuts down against (he squared end of the 

 basal joint. 



All four pairs of lens are biramose; the basal joints of the first 

 pair art> small, of the other pairs much enlarged and laminate. 

 Each is furnished at its outer posterior corner, just outside of the 

 exopod, with a projecting papilla tipped with a long and stout spine. 

 A corresponding but relatively smaller spine is found outside the 



