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EOCENE MOLLUSCA. 



whorl is obscurely angulated at the shoulder, and tapers gradually and equally towards the 

 base ; it presents, in front, several shallow, obliquely transverse furrows, which become 

 more and more feeble as they ascend towards the middle of the whorl, where they are 

 replaced by some distant, very slender, scarcely perceptible, raised lines ; the anterior 

 canal is wide, indistinct, and rather deeply notched at the extremity. The aperture is 

 of a long, narrow, oval shape ; the outer lip much arched, projecting a little towards 

 the anterior extremity ; the sinus, which is placed in the margin, is wide, moderately 

 deep, and triangular in form ; the columella is cylindrical and slightly oblique ; and 

 the columellar lip is elevated and bent outwards, imparting somewhat of an umbili- 

 cated character to the base of the shell. 



Although presenting a close analogy with P. prisca, this Pleurotoma is more sym- 

 metrical in its outline ; the last whorl is more regularly conical, and the sinus wider, 

 shallower, and more trigonal ; these differences and the delicate, transverse linea- 

 tion, confined to the middle and upper parts of the whorls, apparently separate the 

 present species from Solander's. 



The shells from Baden, to which Partsch gave the specific name semistriata, are 

 fusiform, costellated shells, sharply angulated at the shoulders, and having depressed, 

 concave margins ; they are referred to by D'Orbigny, in his ' Prodrome,' as P. sub-semi- 

 striata, while some shells from Tortona, which Bellardi has regarded as also belonging 

 to Partsch 's species, have been named by him P. Lamar cki. 



Size. — Of the specimen figured, axis, rather more than ll-12ths of an inch, (24 

 millim.) ; diameter, 4-12ths of an inch (9 millim.) 



Localities. — Bramshaw. French : Parnes, Mouchy (fide Deshayes), Gomerfontaine, 

 Gypsevil, Amblainville, Chateaurouge, Hermes, Saint Felix, Acy-en-Mulcien (fide 

 Graves) . 



No. 248. Pleurotoma glabrata. Lamarck. Tab. XXXIII, fig. 4. 



Pleurotoma glabrata. Lamk. 1802. Ann. du Mus., vol. iii, p. 184, No. 4. 



— — Lamk. 1822. Anim. sans Vert., &c, vol. vii, p. 98, No. 9. 



— — Desk. 1824-37. Descr. des Coq. foss., &c, vol. ii, p. 439, t. 69, 



f. 7, 8. 



P. testa utrinque sub-conicd, sub-turritd, glabra : spird acuminata, ultimo anfractu bre- 

 viori : anfractibus convexiusculis, obtuse angulatis ; marginibus posticis angustis, cavatis, 

 concenlrice lineatis ; ultimo anfractu antice transversim sulcato, ad basin emargmato : 

 aperturd elongato-angustd ; labro tenui, dilatato ; labio antice producto, reflexo ; columella 

 cglindraced, cristatd : sinu lato, brevissimo, in margine collocato. 



Shell doubly conical, somewhat turreted, nearly smooth ; the spire pointed, mode- 

 rately elevated, forming nearly two fifths of the whole length. The whorls, eight or nine 



