264 PROCEEDINGS OF THE CALIFORNIA 



edited by F. Miiller, 1 Fasicle, 8vo. Melbourne, 1864. Plants 

 indigenous to the Colony of Victoria, Lithograms, by F. Miiller, 

 4to, 1864-5. Review of American Birds in the Museum of the 

 Smithsonian Institution, by S. F. Baird ; Part 1, Middle and 

 North America, 8vo. Washington. Illustrated Catalogue of the 

 Museum of Comparative Zoology, No. II, North American Aca- 

 lephse, by A. Agassiz ; 4to, Cambridge, 1865. 



All of the above publications were presented by the authors or 

 the Societies publishing the same ; those published in Europe were 

 forwarded and received through the medium of the Smithsonian 

 Institution. 



Mr. Dall presented the following paper : 



On a New Subfamily of Fluviatile Mollusca. 



BY W. H. BALL, ACTING DIRECTOR SCI. CORPS, W. U. T. EX. 



A paper was read by Dr. Isaac Lea, before the Philadelphia Academy of 

 Natural Sciences, April 1st, 1856, in which he described a new genus (Pom- 

 pholyx) and species (P. effusa, Lea) of fluviatile mollusca, from California. He 

 placed it in the Family LYMN^EANA without remark. 



In the " Genera of Recent mollusca,"- by H. & A. Adams, it is referred to 

 (Yol. II, p. 645, PI. CXXXYIII, fig. 11) as the only species of the genus and 

 is placed in the Family LIMN^EID^E. 



It is not mentioned by Chenu, in the " Manuel de Conchyliologie." 



In the " Supplementary Report to the British Association," by Dr. P. P. Car- 

 penter (page 674), are given the views of Mr. W. G. Binney, one of the most 

 eminent of American conchologists and particularly devoted to the Pulmonates. 

 He places the mollusk in question, between the genera Limncca and Physa, in 

 the Subfamily LiMX.EiNyE, of the Family LIMNiEIDiE. 



Investigations as to the animal, however, suggest the propriety of separating 

 it, if not (as a Family Pompholidce) entirely from the Family LIMNiEID^E, 

 at least in a subfamily by itself. 



In the few specimens which I have been able to examine with regard to the 

 dentition, the dried animal has not yielded very satisfactory results, and I do 

 not, therefore, feel justified in entirely separating it until more is known. 



In the following table, a West Coast species is given as a type of each genus : 



CLASS PULMONATA. 



Family LIMN^EID^E, H. & A. Ads. 

 Subfamily Limn^in^e, H. & A. Ads. 



