TO INDIAN CAECLNOLOGY. 397 



the genus. A Sacculina frequently occurs on the abdomen, and I have not noticed this 

 in the case of the two other species of the genus which occur commonly at Madras. 



The largest specimen I have seen, out of several hundred examples, is a male with the 

 carapace 265 mm. long and 27 mm. wide (not including the spines), while the average 

 size is considerably less. 



Distribution. South India and Ceylon. 



Genus Leucosia, Fabr. 

 173. Leucosia craniolaris (Linn.). 



L. craniolaris (Linn.), Bell, Trans. Linn. Soc. vol. xxi. p. 283 (1855). 



Rameswaram and Muttuwartu Par (Thurston); Ceylon (Mali/); Gulf of Martaban 

 (Oates); Madras (J. B. H.). 



Distribution. Indian Seas, Malay Archipelago, China. 



17 1. Leucosia Whitmeei, Miers. 



L. TVJiitmeei, Miers, Ann. Mag. Nat. Hist. ser. 4, vol. xvi. p. 342 (1875) ; id. Trans. Linn. Soc. ser. 2, 

 Zool. vol. i. p. 238, pi. xxxviii. figs. 16-18 (1877). 



Gulf of Martaban, two males (Oates). 



The thoracic sinus is deep and well-defined, with two large flattened reniform tubercles, 

 placed immediately over the base of the chelipede (not mentioned by Miers though shown 

 in his figure) ; the anterior tubercle is somewhat larger than the posterior. The front is 

 excavated superiorly and tridentate, with the median tooth very minute. The anterior 

 half or more of the carapace is sparingly punctate, and towards the posterior border there 

 are four dark spots (five according to Miers), arranged in a semilunar line, and the ground- 

 colour of the carapace is light in the vicinity of the spots. The hand is compressed, both 

 towards its inner and its outer margin. The male abdomen is constricted between the 

 penultimate and antepenultimate segments ; on the latter there is a T-shaped sulcus, 

 and on the former a distal median ridge. 



The carapace is 125 mm. long and 10 mm. broad. 



Distribution. Samoa; Fijis (Miers). Shark's Bay, W. Australia (Brit. Mus.). 



Genus Pseudophiltra, Miers. 

 175. Pseudophiltra Melita, De Man. 



P. Melita, De Man, Mergui Crust, p. 199 (1888). 



Muttuwartu Par, a female with ova and a male (Thurston); Gulf of Martaban, two 

 females with ova and two males {Oates). 



I have compared these and found them identical with one of De Man's original speci- 

 mens (a young male). As the colour markings have not been described, and as they are 

 still visible in the above examples, I add the following brief account as a supplement to 

 the original description : — The front is dark brown, and a large irregularly circular brown 



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