CANCROIDEA. 205 



1. Carapax antice posticeque bene areolatits, areola 2 M bipartita. Articulis pedum 

 posticorum Stius superne spinulosus. 



CHLORODIUS UNGULATUS, Edwards. 



Plate 11, fig. 8 a, hand of common variety; b, same of var. gradlis. 

 Navigator Islands ; Tahiti ; Mangsi Islands ; Balabac Passage. 



Common variety. Length of carapax of a male, six and two-thirds 

 lines; breadth, nine and a half lines; ratio, 1 :T43. Colour pale or 

 dark brown, reddish brown, usually more or less clouded or in blotches. 

 The arms project full half their length beyond the carapax. The car- 

 pus and hand are covered by rounded flattened tubercles of small size. 

 The areolation is very deep and the areolets not decompounded. 3 M 

 (intramedial) is hardly subdivided into three parts. 5 L is simple, 

 and but slightly, if at all, indented ; 2 L, 3 L, 4 L are subconical in 

 form ; 1 R, 2 R and 3 R are separated by distinct sulci. The teeth 

 are D, E, N, T, S ; and upon the surface of S there is a slight promi- 

 nence. 



The fingers are long, and when closed there is considerable space 

 between them. The anterior margin of the third joint of the outer 

 maxillipeds is excavate. 



Var. gracttw. Hand and legs more slender, the upper and lower 

 margins of hand nearly parallel, and the lower finger somewhat re- 

 flexed ; while in the common variety, the margin of the lower finger 

 is nearly or quite in the same line with the hand, and the hand is 

 much the broadest at the articulation with the moveable fingers. 



Var. ? it curtimanus. From Tahiti, Navigator Islands, Balabac 

 Passage. The areolation and all the characters as in the common 

 variety, but arms projecting but little in males as well as females. 



Length of carapax of a male, 5'2 lines; breadth, 7'5 lines; ratio, 

 1 : 1-44. The surface is somewhat granulous posteriorly, and so is 

 the sternum. Adams and White in the Crustacea of the Samarang* 

 have figured and described a Chlorodius, as the C. areolatus of Ed- 



* Page 41, pi. ll,f. 3. 

 52 



