Crustacea Decapoda and Stomatopoda. 243 



As in the case of the female recorded by NobiH/ 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.granulatuni and P. andersoniaimm (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-Kdwards), 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) stoliczkanum (Wood-Mason). 



1910. Potamon (Potamon) stoliczkanitm, 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 

 "Lacom" (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. 5CX) (1900). 



2 De Man, in Weber's Zool. Ergebn. Reise Nied. Ost-Ind., II, p. 290, pi. svi, fig. 5 (1892). 



