158 



BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



Diagnosis. — A sharp carina rims on the dorsum from antero- 

 lateral margin across cervical suture. A single, bilobed, cardiac 

 carina. Dactyli of legs slender ; posterior margin of last pair convex. 

 Description of male. — Allied to chaetopterana. Much less hairy. 

 A sharp denticulated carina extends from base of third leg across 

 branchial region and across cervical suture to hepatic region. A 

 sharp bilobed carina on cardiac region. Fixed finger of chela more 

 deflexed than in chaetopterana.^ its basal tooth weaker; dactylus more 

 strongly curved. Legs long and slender; first leg reaches to end of 

 propodus of second, second and third same length, fourth reaching 

 beyond middle of carpus of third ; merus of third leg about 31- times 



as long as wide, its 

 lower margin as well 

 as that of the propo- 

 dus minutely denticu- 

 late; dactjdi of first 

 two legs slightly, 

 curved, of last two 

 straight; anterior 

 edge of dactylus of 

 last leg straight, pos- 

 terior edge convex. 

 Abdomen wider, sides 

 chiefly convex. 



Sexual variation. — 

 Cardiac carina less 

 raised and less diarp 

 in female than in 

 male. Fingers not 

 gaping ; thumb longer, 

 less deflexed, acutely pointed, widened at middle ; dactylus less verti- 

 cal than in male. 



Color. — A rather fresh specimen is covered with very fine brown- 

 ish dots, denser above than below. 



Measurements.— M-a\q (18211), length of carapace 4.8, 

 same 9.7 mm. Female (18806), length of carapace 3.5, 

 same 7 mm. 



Development. — From the zoea direct to the crab form. 

 H ahitat. —E\i\\Qv found free or dug out of the mud. In stomach 

 of ocellated flounder (Verrill). 



/?an^e.— Vineyard Sound, Massachusetts, to Sarasota Bay, Florida. 

 Shore to 20 fathoms. 

 Material examined. — 



Vineyard Sound, Massachusetts; 1871; Verrill, Smith and Todd, 

 U. S. Fish Comm.; 1 female (1880G). 



a l> 



PlO. 98. PiNNIXA SAYANA, MALE (1S211). 0, OCTEK MAS- 



ILLIl-ED, X 20 ; b, ABDOMEN, X 11|. 



width of 

 width of 



