1909.] A. A1.COCK : New Freshwater Crabs. 381 



But, for reasons quite distinct from mine, Ortmann long ago made 

 " Paratclphusa " nilotica the type of a subgenus of Potamon 

 which he named Acanthotelphusa. This name, therefore, must be 

 substituted for Paratelphusula ; and I am very glad of it, for 

 " Paratelphusula " is too much like " Paratelphnsa," and the 

 ' ' Telphusidse ' ' are confusing enough already. Potamon [Paratel- 

 phusula) dayanum, wood-masoni (= edwardsi No. 2), jungosum, 

 fece, calvum, crenuliferum , and martensi, will therefore now stand as 

 Potamon (Acanthotelphusa) dayanum, wood-masoni , fungosum, fece, 

 calvum, crenulijerum, and martensi. 



