34 THE NAUTILUS. 



misconception of Say's species, entertained by the early collectors, is 

 bolh interesting and valuable. 



My attention lias been also recently called to the fact that Tryon 

 first formally differentiated the west coast form from P. corpulenlus 

 as P. binneyi, in his review of Binney's " Land and Fresh-Water 

 Shells," Part II, in the Am. Jour, of Conch., Ill, p. 197 (1867). 

 This citation should, therefore, be added to the bibliography appended 

 to my article in the April NAUTILUS. 



The following typographical errors in that article should also be 

 corrected : 



In foot-note on page 134 delete the words " part of." Also for 

 " Say," in lines one and three, read "Jay." 



On page 136, in the quotation from Mr. Whiteaves' letter, for 

 " five " read " fine." 



PUBLICATIONS RECEIVED. 



SYNOPSIS OF THE AMERICAN SPECIES OF THE FAMILY DIPLO- 

 DONTID^E. By W. H. Ball (Extracted from the Jour, of Conch. 

 Vol. IX. pp. 244-246, Oct. 1899). Dr. Dall says: "The family 

 Diplodontidge comprises the genera Felania, Diplodonta, Unyulina 

 and JoannisieUa. The Cryptodontidre which have been by some au- 

 thors united with this group, possess very remarkable anatomical 

 characters, and should be kept separate. JoannisieUa has long been 

 confounded with Cyrenoides, from which much misconception has 

 arisen. The former is a brackish water Diplodonta with a flattened 

 foot, the latter belongs to a distinct group. The typical Felania is 

 close to Diplodonta, but many Luc.inoid shells have been mistakenly 

 referred to Felania. 



East American Species. 



Diplodonta punctata Say (Ampltidesina). Syn. D. reneznelensis 

 Dkr. D. janeirensis Rve., D. subylobosa C. B. Ads. D. braziliensis 

 Mittre, D. orbella Gabb, Mysia pellucida Heilp. Cape Hatteras to 

 South Brazil. 



Diplodonta nuclei form is Wagner. Syn. D. elevata Conr., D. car- 

 olinense Conr. Coast of the Carolinas, 15-52 fathoms ; fossil in 

 the Miocene of Virginia and N. Carolina. 



Section Felaniella Dall, 1899. 



Diplodonta candeana Orb. Marco, Florida, to Brazil. 

 Diplodonta vilardiboana Orb. Brazil and Argentine coasts. 



Section Phyctiderma Dall, 1899. 



Diplodonta soror C. B. Ads. Jamaica, north to the Florida Keys 

 and Texas ; fossil in the Miocene of Virginia and N. Carolina. 



