Number 38. May 20, 1917. 



OCCASIONAL PAPERS OF THE MUSEUM OF 

 ZOOLOGY 



UNIVERSITY OF MICHIGAN 



Ann Arbor, Michigan. Published by the University. 



THE TYPE OF PLEUROCERA RAFINESQUE. 

 By Bryant Waeker. 



The unfortunate legacy that Rafinesque left to American 

 conchology has been, from the beginning, a source of per- 

 plexity, to say nothing of contention and bitterness, not only 

 to his contemporaries, but to many of his successors. The 

 recent paper by Dr. H. A. Pilsbry (Naut. XXX, 1917, p. 

 109), is an admirable attempt to settle the standing of 

 Rafinesque's dubious genera of fresh-water univalve mol- 

 lusca and, in the main, is a most satisfactory solution of the 

 many questions involved. 



It is unfortunate that Dr. Pilsbry did not see his way 

 clear to retain Campeloma Raf. and Anculosa Say. Both of 

 these names have now had general recognition for many years 

 and should be retained, if it is a possible thing to do so. To 

 replace them by Ambloxis Raf. and Leptoxis Raf., both at the 

 best very doubtful, must be regarded almost as a miscarriage 



