Crustacea Decapoda and Stomatopoda. 243 
As in the case of the female recorded by Nobili/ the granulation of the carapace 
appears to be rather less pronounced than in the large male described by de Man;^ 
though it is far more conspicuous than in any allied species. The extreme develop- 
ment shown in de Man's figures is doubtless to be found only in adult males. 
As de Man has pointed out, the crest of the antero-lateral border is decidedly 
shorter than in related forms : in this respect a marked difference exists between 
P. granulatum and P. under sonianum (Wood-Mason). In the specimens in the present 
collection, however, the granules on this border are more numerous than is indicated 
by de Man ; they are never less than ten in number and are very irregular in their 
size and distribution. 
Potamon larnaudi (A. Milne-Edwards), as Miss Rathbun has shown, is readily dis- 
tinguished by the greater breadth of the mesogastric area. 
The specimens examined were found in the Government Quinine Gardens at 
Tijnproean at an altitude of 5600 ft. The carapace of the large female is 41 mm. in 
breadth and 32 mm. in length. The species has hitherto been recorded only from 
Tijibodas. 
Potamon (Potamon) stoHczkanum (Wood-Mason). 
igio. Potamon {Potamon) stoliczkanum, Alcock, Cat. Ind. Decap. Crust., I, fasc. ii, p. 53. 
Two small males were obtained by Dr. Annandale in the Botanical Gardens at 
Penang ; they were found under stones in a rapid running stream. 
There is apparently some variation in the form of the epigastric and post-orbital 
crests. Those of the larger example do not form an absolutely transverse line, but are 
a trifle more advanced in the middle than at the sides. In the smaller individual the 
line formed by the crests is more nearly transverse, almost as much so as in the types. 
In the larger individual the carapace is 21 mm. in length and 26 mm. in breadth, 
the length of the second walking leg being nearly 47 mm. 
P. stoliczkanum has only been recorded from Penang (Wood-Mason) and 
"Ivacom" (Lanchester). The specimens recorded by de Man from Mergui, under the 
name Telphusa stoliczkana, have been referred to P. thagatense, Rathbun. 
Potamon (Potamon) anacoluthon, sp. nov 
The carapace is longer than in most species of the genus, the breadth being only 
about one and one fifth times the length. The upper surface is slightly convex fore 
and aft and from side to side. The usual H -shaped groove is conspicuous, but other- 
wise the carapace is almost wholly without distinction of regions. The middle por- 
tion of the cervical groove is indicated by a broad and very shallow depression and 
between this depression and the antero-lateral limits of the H-shaped groove there is, 
in both the specimens examined, a small flattened tubercle standing in the middle of 
a shallow pit. The entire surface, though it has a shiny appearance when dried, is 
coarsely and evenly punctate, the punctae being sometimes connected by exceedingly 
1 Nobili, Ann. Mus. Civ. Genova (2), XX, p. 500 (1900). 
2 De Man, in Weber's Zool. Ergebn. Reise Nied. Ost-Ind., II, p. 290, pi. xvi, fig 5 (1892). 
