BTNNEYA. 245 



Linfrnal membrane, as usual in the Ilelicea (PI. V. Fig. K), long and narrow. 

 Teeth 31 — 1 — 31, with about 15 laterals, but the change into marginals is very 

 gradual, the latter being a simple modification of the former. My figures give 

 a central with the first, sixteenth, and thirty-first teeth. 



See remarks under Binneya notabilis, 



Binneya notabilis, J. G. Cooper. 



Shell imperforate, depressed orbicular, ear-shaped, opaque, thin, light horn- 

 color, striated; spire scarcely elevated ; apex obtuse ; suture deeply impressed ; 

 1^ whorls, the first half with about thirty revolving, separated, Fig. 143. 

 prominent, abruptly ending rib-like striae, the last comprising 

 almost the whole shell, depressed above, very rapidly increasing ; 

 aperture sub-horizontal, transversely oval, very large ; peristome ^ twtaMUs. 

 thin, acute, simple ; columella arcuate, with a thin deposit of 

 transparent callus; apex visible from below. Greater diameter 7, lesser, 

 Z\ mill. ; height, 1^ mill. ; greatest transverse diameter of aperture, 7. Of a 

 larger specimen, 14 mill, greater diam. 



Binneya notabilis^ J. G. Cooper, Proc. Cal. Acad. Nat. Sci., III. 62 (1863), 

 figures. — Tryon, Am. Journ. Conch., II. 244 (1866). —W. G. Binney, L. & 

 Fr.-W. Sh., I. 68, Fig. 112 (1869). 



Santa Barbara Island, California; also Guadelupe Island off the coast of 

 Mexico ; probably a species of the Mexican fauna. 



For views of the animal, jaw, and lingual dentition, see above. 



Mr. Hemphill, who has contributed so largely to our knowledge of the land 

 shells of the Pacific Coast, has lately visited the island of Santa Barbara. 

 Among the species found by him is Binneya notabilis, which was originally 

 described from thence by Dr. J. G. Cooper. Mr. Hemphill has kindly sent me 

 living specimens, as well as others preserved in spirits. I am, therefore, able 

 to give a full generic description, with a figure of the animal as it appears 

 when half extended. I did not succeed in inducing it to protrude itself fully. 



When received, the living examples were furnished with the peculiar epi- 

 phragm described by Dr. Cooper. On becoming again active, this epiphragm 

 was left entire, still adhering to the surface on which the animal had formed it. 

 In one individual I observed a second, inner epiphragm, simple, without the 

 perpendicular walls. 



The Mexican genus Xanthonyx is no doubt identical with Binneya, but it 

 does not appear from the figures of alcoholic specimens given by Messrs. Fischer 

 and Crosse (Moll. Mex. et Guat.) that the mantle of Xanthonyx is extended 

 anteriorly, and the position given by them of the respiratory orifice is different. 

 Should future study of the living animal prove my opinion correct, Xanthonyx 

 will be considered as a synonyme. 



Dr. Pfeiffer (Mon. Hel. Viv., VII. 4) suggests the identity of Binneya with 

 Daudebardia^ ignoring entirely the distinction of the first divisions now rccog 



