( 61 ) 



iii. Antennal acicle obscurely bifurcate, the 

 outer branch does not reach the base of 

 the terminal joint of the peduncle ; outer 

 surface of left hand closely and finely 

 granulous : — 



a. Left hand nearly oval, the palm 



higher than long _ 



b. Left palm as long as high, the 

 lower part of its outer surface 

 flattened _ _ 



c. Left hand oblong, the palm longer 



than high ... 



B. The carapace is broader than long: left hand, even 

 when fully extended, strongly inclined inwards __ 



n. The rostrum is a slender simple (non-serrated) spinule : — 



A. Eyestalks not so long as the anterior border of the 

 carapace, or as the antennal peduncle : — 



i. Fixed finger of left cheliped deflexed : — 



a. The eyestalks reach nearly to the 



middle third of the terminal 

 joint of the antennular peduncle 

 (wrist and hand of left cheliped 

 of adult male remarkably elon- 

 gate) _ ... _ 



b. The eyestalks hardly reach the 



base of the terminal Joint of 

 the antennular peduncle : — 



1. A single obliquely-longi- 



tudinal crest on the 

 outer surface of the 

 left palm 



2. Two obliquely-longitu- 



dinal crests on the 

 outer surface of the 

 left palm 



ii. Fi.xed finger of left cheliped not deflexed : 

 a single longitudinal row of spinules on 

 upper part of outer surface of left 

 palm : — 



II. Antennal peduncle very decidedly 

 shorter than antennular peduncle 



h. Antennal and antennular peduncles 

 of equal length „ 

 B. Eyestalks considerably longer than anterior border 

 of carapace, or than antennal peduncle ; left 

 cheliped pilose _ — 



D. affinis. 



D. plantmaiiHS. 



D. violaceiis, 



D. miles (Herbst.) 



D. avtinis. 



D. costiittis. 

 — D. bicrhthnanui, 



D. rectunamis. 

 D. investigatorh. 



_ D, gardmeri. 



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