OF CONCHOLOGY. 



197 



tainly incorrect, as the species is southern in distribution. Pos- 

 sibly the Oregon species thus referred to is the PL subcrenatus, 

 of Carpenter, which is closely related in general appearance. 



PL corpulentus, Say. I agree with Mr. Binney in considering 

 this shell synonymous with PL trivoJvis, and that the West Coast 

 shells usually referred to corpuhntus constitute a new species. 

 As Mr. Binney has indicated this species, but neglected to 

 name it, I propose for it the following name and synonymy : 



Pl. Binneyi, Tryon. 



PL corpuhntus (not of Say). Gould, U. S. Expl. Exped., p. 

 114, f. 130. 1852. 

 Haldeman, Monog. Limniades, p. 19, t. 3, f. T-9. 1844. 

 W. G. Binney, Monog., p. 114, f. 191, 192. 1865. 



Mr. Binney's figure 193 does not represent a form of this 

 species, but rather of P. Ammon, in my judgment. 



PL regularis, Lea, is a shell totally distinct from PL trivolvis; 

 it is a higher species, subcarinate, with the umbilicus very shal- 

 low. It exists abundantly wherever trivolvis and hicarinatus are 

 found. The California and Oregon shells referred by Mr. Bin- 

 ney to trivolvis are probably tenuis, Phil., as trivolvis is not -an 

 inhabitant of the West Coast. 



PL exacutus, Say. PL Buchanensis, Lea, is not a synonym 

 of this species but = dilatatus, Gould. 



Land and Fresh Water Shells of North America. Part 3. Ampulla- 

 riioie, Valvaiidae, Vivi[(aridie, Fresh Water Rissoidse, Cyclophoridae, Trun- 

 catelliuae, Fre«h Water Nentidie, Helicinidie. By Wm. G. Binney. Smith- 

 sonian Miscellaneous Colleclions. 8vo. Washington, 1S65. 



This volume contains 120 pp. Svo, and is illustrated, like the 

 former one, with numerous wood engravings, by Mr. Morse. 



The species belonging to these operculate families being more 

 readily distinguishable than those of the Lymneans, I have fewer 

 criticisms to make. My Vivipara Texana, confounded by Mr. 

 Binney with V. subpurpurea, of Say, has already been recog- 

 nized as distinct in Mr. Reeve's Monograph of the genus Vivi- 

 para, recently published in his Conchologia Iconica. V. multi- 

 carinata, Haldeman, is certainly an Indian, not an American 

 species. Mr. Binney recognizes our so-called V. vivipara as 

 distinct from the European species, but for very insufficient rea- 

 sons substitutes the specific name eontcetoides for liiieata, Kris- 

 ter (not Valenciennes). The name in KUster of course is a mis- 

 print for lineata, and his description and figure are accurate. 

 The Florida specimens referred to V. contectoides are perhaps 

 my V, Waltoni. Vivipara obesa, Lewis, genicula, Conrad, and 



