12 



BULLETIN 166, UNITED STATES NATIONAL MUSEUM 



Range. — Gulf of California, Mexico, to Ecuador; 2 to 26.5 fathoms. 

 Material examined. — See table 2, page 14. 



RANINOIDES LOUISIANENSIS Rathbun 



Figures 6, 7; Plate 1, Figubes 5, 6 



Raninoides louisianensis Rathbun, Proc. Biol. Soc. Washington, vol. 46, p. 186, 

 1933 (type locality, east of Mississippi Delta, 68 fathoms; cotypes, U.S.N.M. 

 no. 9659). 



Diagnosis. — No spine at distal end of merus of cheliped ; five or six 

 spines on lower margin of manus. A slender spine on ischium of sec- 

 ond leg in male. 



Description. — Differs from R. loevis as follows: All the sinuses of 

 the front are longitudinal and shorter than in loevis and are continued 



Figure 6. — Raninoides louisianensis: Male holotype (9659), dorsal view, enlarged. 



backward by a very short gutter. Tooth next to the submedian 

 tooth with a nearly straight inner margin, not distinctly angled; the 

 slender outer orbital tooth is nearly straight. Hepatic tooth longer 

 and straight instead of curved. No spine at extremity of merus of 

 cheliped. Sub terminal spine of manus nearer the end of the upper 

 margin; lower margin with more numerous (five or six) and slenderer 

 spines, with a few minute spinules interspersed. Dactyls of first and 

 second ambulatories shorter and broader, of third leg larger and 

 straighter on outer margin. A slender sharp spine near distal end of 

 ischium of second leg of male. 



