TO INDIAN CARCINOLOGY. 429 



hairy above, with three longitudinal rows of white polished tubercles on the proximal 

 half, and usually four or five tubercles in each row ; the anterior or inner margin has 

 three denticulated lobes or teeth, the first two of which are subequal and the distal one 

 smaller, but in some cases the denticulations normally present on the edges of the 

 primary teeth are absent, and the first tooth may be double, making four in all. The 

 hand is flattened above, with a few tubercular granules scattered over the entire surface, 

 most of which give rise to hairs ; the long outer margin is denticulated, while the under 

 surface is glabrous and finely granulated, especially on the outer side. The mobile finger 

 is denticulated along its upper margin, finely tubercular and tomentose above, sparingly 

 granulated and glabrous below, with a rounded tooth near the base on the inner margin; 

 the fingers show a wide hiatus when closed, and the tip of the mobile one is bent under- 

 neath the tip of the other. The smaller chelipede is similar to the one just described, 

 i. e. the larger, except that the margins of the hand and fingers are more strongly 

 denticulate. The ambulatory legs are short and fringed with hairs, the under surface 

 of the propodus presents two spinules at its distal end, and the dactyli have three 

 minute horny spinules on the posterior margin of their proximal half. 



The carapace of a female is 11*3 mm. long and 13 mm. broad, the left or larger carpus 

 is 65 mm. long and 6 mm. broad, the propodus 12 mm. measured along its outer margin, 

 the first ambulatory leg 15 mm. long. 



It is distinguished from P. grossimanus (Guerin) by its densely tomentose and 

 sparingly granulated chelipedes, and by the denticulated fingers. P. pectinicarpus, Stm., 

 is very briefly characterized and agrees in some respects, but its carpus is described as 

 having the anterior margin " pectinated with eight small equal spiniform teeth," and no 

 mention is made of hairs on the chelipedes, while the carpus is much broader than long. 

 In P. Stevensii, Stm., the chelipedes are not described as hairy, and the hand of the 

 smaller chela is longitudinally bisulcate. 



Genus Porcellanella, White. 



237. PoRCELLANELLA TRILOBA, White. 



P. triloba, White, in Macgillivray's Voyage H.M.S. 'Rattlesnake/ vol. ii. Appendix, p. 394, pi. v. fig. 2 

 (1852). 



Rameswaram {Thurston). 



I have examined White's type of P. triloba, as well as original specimens of P. picta, 

 Stm., from Hong Kong, in the British Museum, and can find only the following differ- 

 ences : — In White's species the median frontal projection but slightly exceeds the lateral 

 ones, and its apex is rounded, while the first or most proximal of the four spinules on 

 the ambulatory dactyli is very small ; in Stimpson's species the median frontal tooth is 

 slightly longer and subacute, and the four spinules on the dactyli are subequal. The 

 two species may yet be united, but at present may be kept separate. 



Distribution. N. Australia ( White) ; Celebes Sea {Henderson) ; Falkland Is. {Hen- 

 derson). 



SECOND SERIES. — ZOOLOGY, VOL. V. 61 



