248 
ZOOLOGY OF THE FAR EAST. 
and 44 mm. in length; the chela is 64 mm. in length with very widely gaping fingers. 
Adults are invariably of a rich reddish crimson colour, stains of which not infre- 
quently occur on the sternum. The six punctae described by Lanchester in his 
account of P. sexdentatum are visible in most of the specimens and four of them are 
often rendered conspicuous by their colouration, which, is pale yellow and contrasts 
sharply with that of the general surface. Young individuals are of a dull olive brown 
tint. 
There can be little doubt that the synonymy given above is correct. P. germaini 
is recorded by Miss Rathbun from many localities in French Indo- China and Siam 
and also from the islands off the west coast of the Malay Peninsula and (doubtfully 
perhaps) from Japan. It is evidently the common river crab of the country round 
the Tale Sap, from which it was recorded by Manchester under the name Potamon 
{Paratelphusa) sinense. 
Subgenus Liotelphusa, Alcock. 
igio. Liotelphusa , Alcock, Cat. Indian Decap. Crust., I, fasc. ii, p. 109. 
Paratelphusa (Liotelphusa) kuhli (de Man). 
1883. Geothelphiisa Kuhlii, de Man, Notes Leyden Mus., V, p. 154. 
1892. Geotelphusa Kuhlii, de Man, in Weber's Zool. Ergebn Reise. Nied. Ost-Ind., II, p. 288, 
pi. XV, figs. 3a-c, pi. xvi, fig. 3. 
1905. Potamon (Geothelphusa) kuhlii, Rathbun. Nouv. Arch. Mus. Paris (4), VII, p. 208. 
Other references are supplied by Miss Rathbun. Hitherto the species has 
invariably been referred to Geotelphusa ; in general appearance it bears a very close 
resemblance to Potamon {Geotelphusa) dehaani (White), and it has been compared in 
detail with that species by de Man. Examination of the mandibular palp shows, 
however, that in spite their external similarity there is no close affinity between the 
two forms. In P. {G.) dehaani the terminal segment of the palp is simple, the species 
belonging to Alcock' s subfamil}^ Potamoninae. In "Geotelphusa" kuhli the terminal 
segment is formed of two lobes which embrace the incisor-process of the man- 
dible ; the species will therefore find a place in the subfamily Gecarcinucinae 
of Alcock' s classification and must be referred to the genus Paratelphusa and the 
subgenus Liotelphusa. It is by no means distantly related to P. {L.) levis (Wood- 
Mason) . 
Paratelphusa kuhli is represented in the collection by a series of more than thirty^ 
specimens of aU ages. In her key to the species of the subgenus Geotelphusa, Miss 
Rathbun lays stress on the presence in this species of a rudimentary epibranchial 
tooth. The use of this character is, however, likely to prove misleading, for the tooth 
is entirely absent in a number of the specimens in the present collection, while in all 
the others only the faintest traces of its presence can be detected. 
The specimens were found by the late Dr. W. C. Hossack in the Government 
Quinine Gardens at Tijnproean in Java at an altitude of 5600 ft. The species is only 
known from Java, 
