604 PLIOCENE MOLLUSCA. 



Odostomia magna, Etheridge and Bell, MS. Plate L, fig. 39. 



1893—98. Odostomia magna, A. Bell, Proc. Roy. Irish Acad. [3], vol. ii, p. 628, 1893; Trans. Roy. 

 Geol. Soc. Cornwall, vol. xii, p. 146, pi. ii, fig. 15, 1898. 



Specific Characters. — Shell small, slender, ovate, conical, smooth, polished ; 

 whorls 8, convex, the last about half the total length, much the largest; spire 

 elongate, regularly diminishing in size to a pointed, compressed apex ; suture well 

 marked, channelled ; mouth ovate, angulate above, rounded and expanded below ; 

 outer lip gently curved; inner lip oblique, slight, with an inconspicuous tooth. 



Dimensions. — L. 6 ram. B. 2 mm. 



Vistiibution. — Not known living. 

 Fossil : St. Erth. 



Remarks. — The shell here represented belongs to the Jermyn Street 

 Museum, where it l)ears the note, " Presented by Mr. E. T. Newton," together 

 with a green label signifying it is the figured specimen of this species.^ By 

 some mysterious mistake a different form has been published under the present 

 name in Mr. A. Bell's paper of 1898, for which the latter disclaims all responsi- 

 bility, as it was issued without any reference to himself. 



Genus JEFFREYSIA, Alder, 1849. 

 Jeflfreysia opalina (Jeffreys). Plate L, fig. 18. 



1848—69. Rissoa {^) opalina, Jeffreys, Aim. Mag. Nat. Hist. [2], vol. ii, p. 351,1848; Jeffreysia 

 opalina, Brit. Conch., vol. iv, p. GO, 1867 ; vol. v, p. 209, pi. Ixix, fig. 6, 1869. 



1853. Jeffreysia opalina, Forbes and Hanley, Brit. Moll., vol. iii, p. 154, pl. Ixxvi, figs. 3, 4 ; 

 vol. iv, p. 267, pl. cxxxiii, fig. 6. 



1859. Jeffreysia opalina, G. B. Sowerby, 111. Ind. Brit. Shells, pl. xiv, fig. 14. 



1884. Jeffreysia opalina var. minor, Monterosato, Enum. e Sinon. Conch. Medit., p, 75. 



1890. Jeffreysia opalina, C'arus, Prod. Faun. Medit., vol. ii, p. 345. 



1892. Jeffreysia opalina, Locard, Coq. mar. Cotes de France, p. 180. 



1892. Jeffreysia opalina, Praeger, Proc. Roy. Irish Acad. [3], vol. ii, p. 278. 



1901. Jeffreysia opalina, Conch. Soc. List, Journ. of Conch., vol. x, p. 18, no. 363. 



Specific Characters. — Shell minute, oval, very thin, semitransparent, whorls o\, 

 convex, rapidly enlarging, the last much the largest, ventricose, three-fourths the 

 length of the shell ; sculpture inconspicuous ; spire short, with an abrupt and 

 blunt point; suture deep; mouth oval, al)out half the total length; peristome 

 continuous; outer lip sharp, thin, incurved above, expanded below; inner Ii)) 

 thickened on the lower part of the pillar with a narrow umbilical chink. 



^ Dr. Kitchin informs me that the specimen in question v?as presented to the Jermyn Street 

 Museum on December 12th, 1898. 



