386 MR. J. E. HENDEESON — A CONTETBUTIOX 



were regarded by Miers as scarcely distinct from T. Jl^tviatilis. In the present limited 

 state of our knowledge as towliat constitutes a species in this difficult genus, I think 

 they mvist he held to be distinct. T. deittimlcda is distinguished, from both T.fluviatilis 

 and T. Atkinsoniana, by its poorly marked postfrontal ridge, and the small size of the 

 epibranchial tooth. T. LarnmuUi is even more closely allied, but is distinguished from 

 both by the greater convexity of the branchial regions, which are sparingly granulated ; 

 the protogastric and epigastric lobes are not granulated as in T. Atkinsoniana; the 

 postfrontal ridge resembles that of T. Atkinsoniana, but towards the epibranchial tooth 

 it becomes interrupted as in T.fluviatilis. 



Distriliution. North India : Darjeeling ; Thancote Hills, Nepal; Khasi Hills [TFood- 

 Ilason) ; Ceylon {Brit. IJm.) 



Genus Pakatelphusa, Milne-Edwards. 



136. Pakatelphusa sinensis, Milne-Edw. 



P. sinensis, Milne-Edwards, Arch, d^i Mus. vol. vii. p. 173, pi. xiii. fig. 2 (1854-55). 



Burmah, an adult male {Lay). 



Bistrihution . China {llili/e-Edtcai'ds) ; Siam {Von Martens); Moulmein, Burmah 

 ( Wood-Mason). 



137. PARATELPHUSA SPINIGERA, Wood-MaSOU. 



P. spiniffera, Wood-Mason, Journ. As. ?oc. Bengal, vol. xl. p. 194, pi. xii. figs. 1-4 (1871). 



Calcutta, Pioorkee, North- West Provinces, Sind, Ganjam {Bay). 



According to Wood-Mason this species is very common in the Calcutta tanks. The 

 British Museum has a series from Bengal. 



Bistrihution. North India {Wood-Mason). It is not known to occur further south than 

 Ganjam. 



138. Pakatelphusa Datana, Wood-Mason. 



P. !)«?/«««, Wood-Mason, Journ. As. Soc. Bengal, vol. xl. p. 192, pi. xi. (1871). 



Tounghoo, Burmah ; ten specimens {Oates). 



This species is characterized by the great convexity of its carapace, and the well- 

 marked postfrontal ridge, with the epigastric portions almost nodose. The four 

 epibranchial teeth (not counting the external orbital angle) very gradually diminish 

 in size on passing backwards, and the greatest diminution is seen in the most pos- 

 terior one. 



The largest specimen, a female, is 3U mm. long, and 41 mm. broad. 



Bistribution. Burmah: Prome andMandalay {Wood-Mason). 



139. Pakatelphusa Martensi, Wood-Mason. 



P. Martensi, Wood-Mason, Ann. Mag. Nat. Hist. ser. 4, vol. xvii. p. 121 (1876). 

 Boorkee, two males ; North-West Provinces, tlu-ee males, two females {Bay). 



