4 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 123 



with spine on mesiodistal margin and prominent tubercle lateral to it 

 articulating with socket on ventral surface of propodus; lateral surface 

 tuberculate. 



Dorsal surface of merus with crowded small tubercles and single 

 prominent spine near distal margin; lateral and mesial surfaces tuber- 

 culate dorsally and ventrally and punctate between; ventral surface 

 tuberculate with lateral and mesial tubercles arranged in irregular rows 

 of approximately 20 tubercles, distal tubercle of both rows very 

 strong and sharp. Ischium with ventromesial margin irregular, 

 bearing approximately 10 small tubercles, otherwise with setiferous 

 punctations. 



Hooks (figs. 8, 11) on ischia of third pereiopods only; hooks simple 

 and projecting proximally beyond distal margin of basis. Caudomesial 

 surfaces of coxae of fourth pereiopods (fig. 11) with very prominent 

 tuberosities provided with long setae. 



First pie op ods (figs. 1, 5, 10, 11) symmetrical and extending cephalad 

 to coxae of third pereiopods when abdomen is flexed. See diagnosis 

 for description. 



Allotypic female. — Excluding secondary sexual characters, dif- 

 fering from holotype in following respects: cephalic section of telson 

 with two long spines in each caudolateral corner; opposable margins 

 of fingers of chelae with single row of minute denticles, and opposable 

 margin of dactyl with six small tubercles in proximal row instead of 

 eight; tubercles on cheliped less well developed than in holotype. 



Annulus ventralis (fig. 7) pigmented 1 (purplish tan), broader than 

 long with slightly upturned (ventrally) lateral margins; broad shallow 

 trough along median line with lateral areas very slightly inflated. 

 Sinus semicircular and situated at extreme caudal portion of annulus, 

 convexity of sinus extending cephalosinistrally. Sternal sclerite 

 immediately caudal to annulus distinctly broader than long and 

 without conspicuous ornamentation. Proannular plate absent. Sternal 

 plate anterior to annulus unadorned but wings tipped with pigment 

 similar to that coloring annulus. (See "Measurements"). 



Morphotypic male, form 11. — Differs from holotype in following 

 respects: spines and tubercles generally smaller, particularly more 

 dorsal pair of cervical spines; cephalic section of telson with two 

 spines in each caudolateral corner; opposable margin of immovable 

 finger with upper row of tubercles reduced to two; upper opposable 

 margin of dactyl with two tubercles between and at corresponding 

 level of those on immovable finger; denticles on opposable margins of 

 fingers more similar to those in allotype. Spines and tubercles else- 

 where on cheliped reduced in size and numbers. Hooks on ischia of 



1 Probably a result of preservation; Mrs. Cooper has indicated she observed 

 no pigment in any of the living individuals. 



