6 PROCEEDINGS OF THE NATIONAL. MUSEUM. vol.63. 



MITHRAX. species. 



Plate 2, fig. S. 



Eepublic of Haiti : About 3 km south of Mole St.-Nicolas ; Pleisto- 

 cene series; January 31, 1921; J. S. Brown (9844) ; part of the center 

 of carapace; Cat. No. 333435, U.S.N.M. 



Surface curved irregularly with acute or subacute tubercles of 

 unequal size, the larger ones being toward the lateral margin. 

 Cervical suture well marked. A shallow groove defines the areole 

 at the inner angle of the branchial region. 



The features of the left side of the carapace have been obliterated 

 by encrustations. 



EXPLANATION OF PLATES. 



Plate 1. 



Figs. 1-3. Portunus (Portunus) liaitensis. 



Fig. 1. Dorsal view of carapace of paratype (9717a), natural size. 



2. Dorsal view of carapace of holotype (9722a), natural size. 



3. Restoration of carapace, bashed on tigures 1 and 2. X2. 



Figs. 4-6. .^PanopeMS, species, three movable fingers (9907). X8. 



Fig. 4. Right dactylus, upper-outer view. 



5. Left dactylus, upper view. 



6. Right dactylus, outer view. 



Plate 2. 

 Figs. 1-3. Portunus (Portunus) haitensis, natural size. 



Fig. 1. Outer surface of right manus, paratype (9722c). 



2. Ventral surface of paratype (9722d). 



3. Ventral surface of paratype (9717&). 



Figs. 4 and 5. Parthenope, species, right palm (9907). X3. 



Fig. 4. Upper and outer surfaces, viewed obliquely. 

 5. Upper surface. 



Figs. 6 and 7. Zanthopsis, species (9792), natural size. 



Fig. 6. Outer view of right palm. 



7. Cross section at base of fingers. 



Fig. 8. Mithrax, species, portion of center of carapace (9844), natural size. 



