54 CRUSTACEANS OF THE 



that was captured at Sanggau on the Middle Kapoeas. It 

 is closely allied to the rare Menippe Panope Herbst from 

 Tranquebar, a species not yet found back since Herbst, 

 as far as I know, and that perhaps once may prove to 

 be also a freshwater crab, whereas the other representa- 

 tives of Menippe and Myomenippe are marine forms. A 

 new description and a figure of the equally little-known 

 Myomenippe Fornasinii, made after a type-specimen from 

 the Paris Natural History Museum, is added, though this 

 species was not collected. A pretty small Sesarma proved 

 also to be new, unfortunately the locality was not defined, 

 but very likely it has been collected at Sintang. 



The other 11 or 12 species are all Thelphusidae. Pa- 

 rathelplmsa tridentata H. M. E. is represented by 15 spe- 

 cimens; this species is, already since 1868, known to in- 

 habit Borneo by von Martens. This author described in the 

 same year also a new Potamon from Borneo, Potamon 

 borneense, a new variety of which was now collected, pro- 

 bably at Sintang. For this species and for two other new 

 ones a new subgenus Perithelphusa is established. 



An interesting new species, belonging to the subgenus 

 Potamon s. s., was discovered by Dr. Nieuwenhuis on the 

 Upper Mahakkam , and another allied form on Mount 

 Damoes and on the Upper Sibau river. Both were compa- 

 red with type-specimens of Pot. sinuatifrons H. M. E. from 

 the Paris Museum. 



On the Liang-Koeboeng Chain a remarkable new Po- 

 tamon was captured, that bears a striking resemblance to 

 Pot. austenianuni W.-Mas., a species that inhabits Assam 

 and that evidently is represented in Borneo by the new 

 species. The four remaining belong to the subgenus Geot/iel- 

 phusa and are all new to science. 



Professor Burger of Göttingen was so kind as to send 

 me the type-specimens of the Thelphusidae described by 

 him in 1894. None of these species from the 

 Philippines and Cape York proved to be iden- 

 tical with those of the Borne o-E xpeditiou and I 



Notes Irom the Leydeji Museum, Vol. XXI. 



