2')2 Capt. A. C. MacGilchrist on Decapod Crustacea 



are stout at the base and rapidly tapor towards the tips, and 

 for this reason they a])pear relatively shorter than in 

 McArdle's specimen. Both ehelipeds of this new speeitneii 

 are equally enlarged, and the relative lengths of their joints 

 are maintained and correspond with tliose of the type 

 specimen. Tiiose ambulatory legs which happen to be present 

 are not disproportionate in length or thickness when com- 

 pared with the " type." 



In the small male (length of carapace and rostrum 11 mm.) 

 cauglit at Sta. 82.2, east of South Andaman Island, 378 

 fathoms, the ehelipeds are slender and resemble a female^s. 



There is no evidence of the " type " having been attacked 

 by parasites or other disease which might account for the 

 ehelipeds not being enlarged. 



The relative size of the hand and palm in the " type," new 

 male, and egg-laden female respectively can be judged from 

 the following measurements : — 



Tvpe New Ovige- 



"cT . S- rous $ . 



mm. mm. mm. 



Leiiglli of caviipoce and rostriuu '-t'-'th -9 21 j 



,, gastiic spine 13 11 7 



„ Lrancliial spine 8 7 4 



Greatest Ijieadili Pd 28 'Jl 



Leugth of clieli})eds 77 lUO 4o| 



,, liand 35i 4Gi 21 



Maximum ai.d mininiiiui liroadtli of 



palm oi-3| 11-4 2i-l| 



Description of the female. — The egg-laden female was 

 caught at Sta. 323, west of Cape Negrais, 403 fathoms. As 

 in the male, on the strongly deflexed anterior portion of the 

 carapace are well-raised granular ridges, three on either 

 side extending from the large gastric spine to (1) the promi- 

 nent postocular spine, (2) base of rostrum, and (3) base of 

 concavity of orbital notch. The two innermost ridges which 

 run to the base of the rostrum are thickly coated with long 

 peg-shaped hairs, liostral spines form a U-shaped interspace 

 ancl the interantcnnulary spine descends in the same plane 

 as the deflexed anterior portion of the carapace. There is 

 merely a warty tubercle or prominence on a granular mesial 

 ridge midway between tiie two long gastric spines. Similarly 

 a sliort warty transverse ridge represents the small intestinal 

 spine. 



The antero-external angle of the merus of the external 

 maxillipeds is produced as a Hat rounded projection armed 

 with 3 or 4 acute spinules on its margin. Chelipeds and 

 legs are armed with spines and setae. 



