TO INDIAN CAKCINULOGY. 443 



pubescent aud slightly scabriculate, with the carpus about (n^ual to the palm ; the 

 fingers are longer than the palai, and slightly curved iu tiie male, with their opposed 

 margins finely toothed and pubescent. The right chelipcde is usually larger than the left. 

 In the female the chelipedes are less elongated, and the lingers may be slightly shorter 

 than the palm. The telson is truncated, but obtusely pointed at the apex, with the inner 

 spinules and the seta? very long. 



A male is 12 mm. long, not including the rostrum, the right chelipcde 45 mm., and 

 the left chelipcde 33 mm. 



Distribution. Ceylon (Hdler) ; Saleyer and Celebes {De Man). 



2G5. Pal.^mon Datanus, n. sp. (PL XL. figs. 7-13.) 



A large series from Orissa, Jabbulpore, Calcutta, Beerbhoom, Debroo *, Delhi, Roor- 

 kee, Hurdwai', Loodiana, River Jumna, Lahore {Day). 



The rostrum is usually almost straight, aud extends to the end of the antennal scales, 



with the formula ^r— ^ ; on the upper margin the six proximal teeth are equidistant, 



and separated by a wider interval from tAvo, or more rarely three, smaller subapical 

 teeth, wliich are placed close together, while the second, occasionally the third, proximal 

 tooth is placed above the orbital margin ; on the lower margin the teeth are equidistant, 

 and slightly decrease in size towards the apex. The free end of the antennal scale is 

 rouud(>d, and scarcely angulated internally. The carapace is smooth, with the hepatic 

 spine rather small, and a faint sulcus which commences below the level of the latter 

 extends back almost to the middle of the side wall of the carapace. 



The fir-«t legs exceed the antennal scales by the length of their fingers. The second 

 legs are of equal size, and rather short, being shorter tlian the body, but moderately 

 stout; they are pubescent, and very slightly scabrous. The merus and carpus are subequal 

 in length, the latter being very slightly the longer; the carpus widens slightly towards 

 its distal end, and is equal in length to the prilm or occasionally a little longer ; the palm 

 is practically cylindrical, and slightly wider than the carpus. The fingers are two thirds 

 or more the length of the palm, and pubescent, with sharp cutting-edges in both sexes, 

 and one or two minute basal teeth ; when examined with a lens after removal of the 

 hairs, they are seen to be finely ridged longitudinally on all sides, and punctate between 

 the ridges. The ambulatory legs are rather slender. The telson is shorter than tlio 

 terminal appendages ; its apex is ratlier broad, hut with a short median spine; the inner 

 spinules are considerably longer than tlu; median point, and more than twice the length 

 of the outer spinules. The fertilized eggs carried by the female are remarkably large 

 (in some specimens nearly 2 mm. in diameter), and this perhaps points to direct develop- 

 ment occurring in the species. 



An adult male from Roorkee is 4S mm. long, not including the rostrum ; the fii'st legs 

 are ID'") mm. long, and the second legs 3(J mui. long. An adult female from tlie same 

 locality is 45 mm. long, the first legs are 17'5 mm., and the second legs 29 mm. The 

 largest specimen is a male from Beerljlionm .").") mm. long ; and a female with ova from the 



* The locality thus expressed ou the hibel of the bottle is probably the lliver Diljru in Assam. 



