( 66 ) 



The anterior surface of the propodite and dactylus of the 2nd and 3rd 

 legs is granulosa, not spinulose. 



Distribution : Bay of Bengal, S. E. coast of Australia. 



4708—13 



10 ' 



4368-70 

 10 ' 



Orissa coast " Investigator. " 



Akyab W. Dodgson. 



36. Diogenes custos var. violaceus, Henderson. Plate VI., fig. 4. 



Diogenes violaceus, Henderson, Tr. Linn. Soc, Zool., (2) V. 1893, p. 416, pi. xxxix., 

 fig. 3, 4. 



This form differs from typical D. custos in the following particulars : — 



As in var. affinis the inner fork of the antennal acicle is nearly obsolete, 

 and the outer fork falls far short of the base of the terminal joint of the 

 peduncle. 



The hand of the left cheliped is entirely different in form : its palm 

 is decidedly longer than broad, so that the dactylus, though long, does not 

 make up two-thirds the total length of the hand ; and the hand as a whole 

 is oblong instead of nearly oval. 



The antennal flagellum is less coarsely setose. 



From var. affinis, which it resembles in the form of the antennal 

 acicle it differs in having a longer rostral scale, and a longer antennal 

 flagellum, and in the long and comparatively narrow left hand, the fixed 

 finger of which has a straight lower margin. 



7.S52 



— 1- — . Vizagapatam Museum Collector. 



The only specimen in the Indian Museum inhabited a broad-mouthed 

 violet shell of Leiodomus tividus. 



3c. Diogenes custos var. planimanus, Henderson. Plate VI^ fig. 3. 



Diogenes planimanus, Henderson, Tr. Linn. Soc, Zool., (2) V. 1893, p. 416, pi. xxxix., 



fig. 5, 6: Lanchester, P. Z. S., 1902, II., p. 365: Nobili, Boll. Mus. Zool. Torino, XVIII. 



No. 452, 1903, p. 15. 



Differs from typical D. custos in the following particulars : — 



As in var. affinis and var. violaceus the inner branch of the antennal acicle 



is obsolete, and the outer branch falls far short of the base of the terminal 



joint of the peduncle. 



As in var. affinis the rostrum is short, not much exceeding the ophthalmic 

 scales, but it is remarkably narrower. 



