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U.S. NATIONAL MUSEUM BULLETIN 292 



Palaemon jamaicensis f. aztecus. — Pesta, 1931, p. 177. 



Peridimenes portoricensis Schmitt, 1933b, p. 3, fig. 2 [type-locality: Puerto Rico]. 



Macrobrachium carcinus. — Hedgpeth, 1949, p. 31, figs, lb, 3, 5. — Holthuis, 1952, 



p. 114, pi. 30; pi. 31: figs. a-c. — Lewis, Ward, and Mclver, 1966, p. 48. 

 Macrobrachium carinus. — Geijskes, 1954, p. 69. 



Diagnosis. — Carapace with antennal and hepatic spines, without 

 branchiostegal spine. Rostrum usually reaching to or slightly beyond 

 end of antennular peduncle, dorsal margin sinuous, tip slightly 

 upturned; armed with 11 to 16 rather regularly spaced dorsal and 3 

 or 4 ventral teeth; posterior 4 to 6 teeth of dorsal series placed on 

 carapace behind level of orbital margin. Eyes large, cornea well 



Figure 21. — Macrobrachium carcinus, male (carapace length 63.8 mm) from Dominica 



station 96. 



pigmented. Second pereiopods of adult male subequal, robust; 

 fingers slender, very slightly shorter than palm, gaping in proximal 

 part, strongly crossing at tips, opposable margin of each armed near 

 midlength (dactyl) and near end of proximal third (fixed finger) 

 with large tooth, fixed finger partially pubescent; palm slightly 

 compressed, more than three but less than four times as long as 

 wide, armed with scattered spines, spines longer and less numerous 

 near margin continuing onto fixed finger but not forming crestlike 

 row; carpus about half as long as palm and slightly shorter than merus. 

 Third pereiopod with propodus slightly more than twice as long as 

 dactyl. Color pattern characterized by longitudinal dark and light 

 stripes on carapace and abdomen. A very large species, maximum 

 postorbital carapace length more than 90 mm. 



