198 AMERICAN JOURNAL 



subsolida, Anth., are all distinct from V. integra, Say. If V. 

 MiJesii, Lea, is not also a distinct species, it is a synonym of 

 subsolida rather than of decisa. V. Bengalensis, Lam., said to 

 be found in Florida, is my V. Waltoni. 



The portion of the work referring to Fresh Water Rissoidse is 

 in its arrangement identical with Dr. Stimpson's classification of 

 these shells.* 



The figure of Tryonia clathrata is not at all characteristic. 

 Somatogyra integer and pumihis are different species. 



Blelantho De Campi, Currier, is figured and described in the 

 Appendix, with the following observation : "About a dozen spe- 

 cimens were collected. All but the one drawn in fig. 227 could 

 not be distinguished from 3IeJania without the presence of the 

 operculum, thus furnishing another example of the impossibility 

 of ascertaining from the shell alone the generic position of the 

 species. It is probable that other species of 3Ielantlio have been 

 described as Melanias." 



When Mr. Binney received specimens of this species he 

 showed them to me without the opercula, and asked me to assign 

 their generic position. I instantly referred them to MeJmitlio. 

 He then called my attention to their extraordinary resemblance 

 to 31elcmia, but this resemblance I entirely failed to perceive. 

 In fact they no more resemble the latter genus than does any 

 other species of Viviparidre, and I am certain that no person 

 acquainted with the two genera would confound them. Mr. 

 Binney's illustration of the impossibility of determining genera 

 by the shell alone is thus quite as unfortunate as those given by 

 Dr. J. E. Gray, in an elaborate memoir published many years 

 since, and every one of ivhich are readily distinguished by the 

 shell only. 



Grillia ? from Stephenson, Ala., and Powel's River, Tenn., 



is G. parvula, Tryon, published in Vol. I. of this Journal. 



Catalogo de los Moluscos Terrestres y Fluviales de la Isla de 

 Cuba. By Rafael Arango y Molina. 8vo., 78 pp. Havana, 18G5. 



This is a very complete catalogue, with copious synonomy, 

 localities and notes, and an introduction by Dr. Felipe Poey. 

 The paper is extracted from the " Repertorio Fisico-natural, de 

 la Isla de Cuba." 



* See my review of Dr. Stimpson's work, Am. Jour. Conch., ii., p. 152, 

 1866. 



