124 



BULLETIN 97, UIHTED 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, — Ivnown only from Sarasota Bay, Florida. 



DISSODACTYLUS ALCOCKI,* new species. 



Plate 28, figs. 3 and 4. 



Type-locality. — Gulf of Mexico, off Delta of Mississippi Eiver ; 35 

 fathoms; station 2388, Albatross; 1 female holotj'pe (Cat. No. 23147, 

 U.S.N.M.). 



Diagnosis. — Carapace without dorsal ridge. Front bilobed. Legs 

 slender and spinulous; secondary spine of dactyls 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 



/ 

 /• 



Fig. 70. — Dissouactylus alcocki, outer maxillu-eu 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. 



LoAver 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 stehhingi; palp very 

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

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

 tylus as long as propodus but narrower. 



.* Named for Dr. A. Alcock, Loudon. 



