1899.] A. Alcock — Carcinological Fauna of India. 133 



Colours : dirty whitish, with a bluish tinge on the carapace and a 

 faint reddish tinge elsewhere; eyes chocolate. 



Two males and a female, from off the Travancore coast, 430 fms. : 

 a small male from the Andamans, 238-290 fms. 



The carapace of the largest male is 20 millfm. long and 15 millim. 

 broad, that of the female is 30 millim. long and 24 millim. broad. 



Named in memory of the great Arctic explorer William Baffin, 

 who, according to Sir Clements Markham, was the first Englishman to 

 actually plot charts in these Seas. 



Family DYNOMENID^. 



This family includes two genera which may be thus diagnosed : — 

 I. Carapace flattish, broader than long, 



covered with hairs Dynomene. 



II. Carapace convex, longer than broad, 



covered with spines or spinules Acanthodromia. 



Dynomene, Latreille. 



Dynomene, Latreille in Cuvier's Eegne An. (nouv. ed. 1829) p. 69 : Desmarest, 

 Consid. Gen. Crast. p. 133 : Milne Edwards, Hist. Nat. Crust. II., 179: Lamarck, 

 Hist. Nat. Anim. sans Vert. (2nd ed.) p. 482 : De Haan, Faun. Japon. Crust, p. 104 : 

 Dana, U. S. Expl. Exp. Crust, pt. I. p. 402 : A. Milne Edwards, Ann. Sci. Nat. Zool., 

 (6) VIII. 1879, Art. 3 : Ortmann in Bronn's Thier Reich, V. ii., Arthropoda, p. 1155. 



All parts usually tomentose. 



Carapace subcircular, flattish, broader than long. 



Front broadly triangular, dorsally grooved, more or less distinctly 

 notched or divided at tip. 



Palate well delimited from epistome : efferent branchial channels 

 well defined. 



The chelipeds usually do not differ greatly in size from the first 3 

 pair of legs : these are stout and of about equal length. 



The 4th (last) pair of legs are quite rudimentary and alone are 

 dorsal in position. 



As regards the branchial formula, according to Bouvier it follows 

 the Dicranodromia and Homolodromia type.* 



Distribution : Tropical Indo- Pacific, from Madagascar to California. 



2. Dynomene piluninoides, n. sp. 

 The carapace and appendages are covered with an exceedingly 

 thick tomentum of club-shaped hairs, the chelipeds and legs are also 



* The material at my disposal, at present, does not permit me to indulge in 

 dissection ; but I have been able to make out that the branchial plumes and epipod- 

 ites are more numerous than they are in Dromia, Cryptodromia, &o. 



