244 NATURAL SCIENCE [April 



connue, ou tres-rarement plusieurs, et j'y ai joint quelques synonymes 

 que je puis certifier ; cela suffit pour me faire entendre." The 

 expressions, ' j'ai cite uue espece connue ' and ' cela suffit pour me 

 faire entendre,' are exactly applicable to Latreille's list in 1810, 

 which, whatever its merits or shortcomings, must be absolutely 

 acquitted of any charge of type-mongering ambition. 



Dr Faxon, while upholding Astacas as a genus of crayfishes, 

 divides it into two subgenera, Camharoides and Astacus, and, as he 

 identifies the Astacus Jiuviatilis auctorum with Cancer astacus 

 Linn., the name of this species with him will become Astacus 

 {Astacus) astacus (Linn.) Faxon. It is a matter of taste, but one 

 would scarcely expect a countryman of Frank Stockton, Mark 

 Twain, Artemus Ward, and so many others capable of acutely 

 distinguishing between the serious and the absurd, to struggle for 

 the honour of being stepfather to such a designation. By ignoring 

 the rightful claims of Potamohius Dr Faxon is only prolonging 

 confusion in a group with which his own reputation is so honour- 

 ably connected. Thomas R. R. Stebbing. 



