446 Dl^ J. G. DE MAN ON CEUSTACEA CHIEFLY 



Measurements of four typical specimens of P. lanzi {continued). 



6- c?. 5. 2. 



Breadth of the anterior margin of tlie penultimate joint . . 6 4"6 



„ „ posterior „ „ „ ... 775 6 



Length of the terminal joint 5 3'6 



larger chela 27-5 18-6 22-5 18 



palm 15-5 10 13 10 



Height of the palm at the articulation o£ the fingers . . . 11-3 7 9'3 6'7j 



C— DARJEELING, BENGAL. 



Pal^mon (Parapal^mon ?) HENDERSONi, de Man. (PI. 33. figs. 66-68.) 

 Palamon [Parapalmmont) hendersoni, de Man^ in Ann. & Mag. Nat. Hist. ser. 7, vol. xvii. 1906, p. 405. 



Three specimens from Darjeeling, fresh water, at a height of 2500 feet, collected by 

 Mr. J. A. Gammie. 



Apparently a new species, which I have the pleasure of dedicating to Prof. J. Pt. Hender- 

 son, of Madras, author of "A Contribution to Indian Carcinology," and other useful papers. 

 This species is somewhat related to Fal. altifrons, Hend., from Delhi and Lahore, to 

 Pal. scahriculus, Heller, from Ceylon, and P«Z. {Macrobrachium) latimanus, v. Martens. 



The largest specimen is 61 mm. long from the tip of the rostrum to the ead of the 

 telson ; the carapace, rostrum included, is 25 mm. long, almost half the length of 

 the whole body. The caraj)ace is scahriculate on its anterior half, being closely covered 

 with minute spinules ; the branchial regions are smooth, finely punctate, but on the upper 

 surface of the carapace the scahriculate area reaches nearly to the posterior border. 

 The rostrum, which is short, reaching only to the middle of the penultimate joint of the 

 antennular peduncle, arises from the anterior third of the carapace, and its free part is 

 directed ohliquely doionioard, so that the acute tip is situated at a much loioer level than 

 the surface of the carapace. The upper border (PI. 33. fig. 66) is armed, in the two larger 

 specimens, with seven rather small and low teeth, in the third with six. The first tooth, 

 situated at one-fifth of the length of the carapace from the frontal border, is, in the 

 two larger specimens, twice as far from the second as are the following, which reach 

 to the tip ; in the third specimen, however, the six teeth are equidistant. The first three 

 teeth are situated on the cephalotborax. The nearly straight lower border carries, in 

 the largest specimen, one single tooth not far from the tip and placed immediately 

 below the foremost tooth of the upper border : in the smallest specimen there is also one 

 tooth on the lower border, but it is situated between the foremost tooth of the upper 

 margin and the tip. In the third specimen, which is 52 mm. long, the lower border 

 carries two teeth, situated just behind and before the foremost tooth of the upper border. 



The formulse of the three specimens are therefore: --p' -^, and -j-. The free part of 

 the rostrum is narrow, and that part which is situated above the lateral crest appears 

 in the middle of the free part but little liigher tlian that below it. 



The antennal spine is small and reaches barely beyond the frontal border. The hepatic 

 ypine is extremely small and, in the two larger individuals, it is even wanting on the right 



