164 BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



Middle San Francisco Bay: 9 to 7 fathoms; fne., semiliquid brown- 

 ish-gy.'M.; temp. 12.69 C.; Feb. 6, 1912; station 5706, Albatross; 

 1 male (48439) ; with shortish thumbs, fingers gaping, palms 

 almost smooth. 7^ to 9 fathoms ; sft. gy. M. ; temp. 12.72 C. ; Feb. 

 28, 1912 ; station 5718, Albatross; 1 female (48444) ; with long 

 thumbs, nongaping fingers and granulate palms. 8| fathoms; very 

 muddy S.; temp. 12.69 C.; Dec. 18, 1912; station 5825 A, Albatross; 

 1 female (48443) ; with unequal chelae, long thumbs, nongaping 

 fingers and granulate palms. 



Lower San Francisco Bay; 9^-1^ fathoms; bk. stky. M. Sh. 

 Clinkers; temp. 12.85 C.; Mar. 6, 1912; station 5723, Albatross; 1 

 female holotype (48441). With long thumbs, non-gaping fingers and 

 granulate palms. 



PINNIXA HIATUS, new species. 



Plate 36, figs. 1-4. 



Type-locality. OS Catalina Island, California ; 50 fathoms ; H. N. 

 Lowe; 1 female holotype (Cat. No. 29949, U.S.N.M.). 



Diagnosis. Dactyli of legs styliform. Fingers gaping; propodal 

 finger shorter, subtruncate at tip ; a ridge near outer margin of each 

 finger. Posterior margin of carapace long. 



Description of female. Carapace very wide, narrowed at sides, 

 antero-lateral margin arcuate without a definite angle and marked by 

 a raised and finely granulate edge up to hepatic 

 region ; posterior margin very long and straight ; 

 front advanced, widely emarginate in dorsal 

 view. Surface smooth,, sparingly punctate, a 

 groove behind gastric region. Subhepatic region 

 3^ prominent. .Orbits oval, filled by eyes. 

 *W Palm suboblong, upper margin convex, lower 

 2 ' ~OVTS* MAxiL- mar gi n f palm and thumb sinuous, a granu- 

 LIPED OF FEMALE HOLO- lated ridge on distal half just above lower edge. 

 PE> > A corresponding ridge on dactylus. Thumb 



definitely shorter than dactylus and curving up toward it, extremity 

 obliquely notched by means of a tuberculiform tooth. Dactylus 

 curved, a tooth just behind middle; a wide gape when fingers are 

 closed. 



Merus of first leg slender, of other legs narrowed at distal end; 

 carpus of all legs longer than propodus ; propodus tapering distally, 

 but wider at end than adjoining end of dactyl ; dactyls styliform, more 

 slender in first and second pairs ; in third pair, the anterior edge of 

 merus and posterior edge of propodus is finely saw-toothed, posterior 

 edge of merus more coarsely granulate, anterior edge of dactylus 

 spinulous. Posterior margin of merus of second leg finely granulate. 

 Posterior margin of third leg and both margins of last leg fringed 

 with hair. 



