124 



BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



broadly oval; palp small, articulated at summit of merus; propodus 

 shorter than carpus, elongate-suboval, bearing a small, squarish 

 dactyl at inner end of distal margin. 



Chelipeds and legs not known. 



Male abdomen and sternum punctate. First and second segments 

 of abdomen completely fused, slightly constricted at middle; third to 

 sixth, inclusive, completely fused, sides nearly straight, seventh 

 wider than long, with arcuate margin. 



Measurements. Male holotype, length of carapace 3.3, width of 

 same 4.3 mm. 



Range. Known only from Sarasota Bay, Florida. 



DISSODACTYLUS ALCOCKI, 1 ntw ipeciei. 



Plate 28, figs. 3 and 4. 



Type-locality. Gulf of Mexico, off Delta of Mississippi~River ; 35> 

 fathoms; station 2388, Albatross; 1 female holotype (Cat. No. 23447, 

 U.S.N.M.). 



Diagnosis. Carapace without dorsal ridge. Front bilobed. Legs 

 slender and spinulous; secondary spine of dactj'ls 1 to 3 beneath 

 primary spine. Palp of outer maxilliped 3-jointed. 



Description. Carapace convex fore and aft, nearly level from side 

 to side ; antero-lateral margin acute, with a milled rim and forming 



FlG. 70. DlSSODACTYLCS ALCOCKI, OTJTEH MAXILLll'ED OF FEMALE HOLOTYPE, X 73. 



a broad, rounded lateral angle and continued along the nearly 

 straight and oblique postero-lateral margin; no dorsal ridge. Front 

 bilobed, continuing the line of the antero-lateral arch, median sinus 

 a broad, shallow, rounded sinus. Posterior margin deeply sinuous. 



Lower surface of carapace and mouth parts and edge of female 

 abdomen hairy. Outer maxillipeds compact, forming a triangle; 

 merus-ischium spatulate, less dilated than in stel>l>ingi; palp very 

 small, folding under the thin edge of the merus and articulating near 

 its extremity; propodus short, sides subparallel, end truncate; dac- 

 tylus as long as propodus but narrower. 



1 Named for Dr. A. Alcock, London. 



