TO JNDIAN CARCINOLOGY. 385 



This species bears some general reseiublaucj to T. ludica, but is distinguished irom 

 that species by the peculiar nature of the postfrontal ridge, which, though well marked, 

 does not pass to the lateral margin of the carapace, stopping short abruptly before reach- 

 ing it ; the rudimentary epibranchial tooth is placed near tlie external orbital angle, 

 and the contiguous part of tlie carapace is deeply hollo wed out. In T. celebensis, De 

 Man, a species also with a well-marked postfrontal ridge which does not pass into the 

 epibranchial tooth, there is a second small tooth placed between the epibranchial one 

 and the external orbital ansrle. 



The largest specimen, a male, has the carapace 30'5 mm. long, and the greatest breadth 

 13'3 nmi. ; the distance between the external orbital angles is 28'3 mm,, and between the 

 epibranchial teeth SI'S mm. ; the front is 12 mm. in breadth. 



I have named the species after Mr. R. I. Pocock, of the British Museum Staff. 



134). Telphusa fluviatilis, Latr. 



T. flttviatiUs (Latr.), A. Miliic-Edwards, Nouv. Arcli. Mus. Hist. Nat. t. v. p. 1(J1 (1869). 



Quetta, a series in the British Museum, collected by W. T. Blanford, and another 

 series from the same locality presented by the Secretary of State for India. " Environs 

 of Calcutta '' {Coll. Schlagintweit). The latter locality is probably erroneous, and the 

 specimen perhaj)s came from the Himalayas. 



The occurrence of this species so far east is interesting. I have compared the speci- 

 mens carefully with a large series in the British Museum from various localities on both 

 the European and African sides of the Mediterranean, and can find no differences of any 

 importance. There are specimens in the British Museum from Sustau, Persia. 



Distribnfion. Italy, Greece, Turkey, Crimea, Syria, Egypt, Algeria, Cyprus {A. Milne- 

 Edwards). 



135. Telphusa Atkinsoxiana, Wood-Mason. 



T. Atkinsoniana, Wood-Mason, Journ. As. Soc. Bengal, vol. xl. p. 205, pi. xiv. figs. 12-16 (1871). 



Kangra, four females {Uoy) ; British Burmah, a male ( W. Theobald) ; Simla, several 

 young specimens {Coll. Schlaguitiveif). 



The Kangra examples are not fully grown (the largest is only 21 mm. long and 27'5 

 mm. broad) and they have apparently not acquired all the typical characters. The 

 granulations are scarcely represented on the epigastric and protogastric lobes of the 

 carapace, and the outer surface of the hands is only sparingly tube rculate ; there can, I 

 think, be no doubt, however, of tlieir identity. 



This species is closely allied to T. fliwiatills, but the two may be distinguished as 

 follows: — In T.Jluciatilis, the portion of the postfrontal ridge bounding tlie epigastric 

 lobes is placed Avell in advance of, and is practically cut off from, the rest of the ridge, 

 while in T. Atkinsoniana it is continuous with the rest. In T. ftuviatilis, the ridge is 

 somewhat ill defined and more or less interrupted laterally, where it passes into the 

 epibranchial tooth, while in T. Atkinsoniana it is strongly defined and prominent at 



this point. 



Specimens of the two allied species T. denticidata, Milne-Edw. (China), and T. Lar- 

 naudii A. Milne-Edw. (Siam), are in the collection of the British Museum, and they 



