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EOCENE MOLLUSCA. 



No. 209. Pleurotoma zeta. F. E. Edwards. Tab. XXXI, fig. 16. 



P. testa oblongo-fusiformi, sub-lavi : spird sub-conicd : anfractibus convexiusculis ; 

 marginibus posticis angustis, concavis ; ultimo anfractu antice repente coarctato, in canalem 

 longum, angustum, produclo, supra canalem obscure lineato : labro vice arcuato, fere recto ; 

 sinu lato, minime prof undo, ad humerum collocato. 



A nearly smooth, oblong-fusiform shell, with a somewhat conical spire ; the 

 whorls slightly convex, having narrow posterior margins, obscurely channelled, with 

 a simple sutural edge : the last whorl much contracted in front, and terminating 

 in a long, rather narrow canal, over which appear a number of close-set, irregular, 

 and very obscure concentric raised lines ; the outer lip is scarcelv curved, nearly 

 straight, projecting towards the front, and the sinus, which is placed on the shoulder, 

 is wide and very shallow. 



Although I possess but one specimen, and that imperfect, the smooth surface of the 

 shell, and the narrow, nearly straight outer lip, are characters so uncommon among the 

 fusiform Pleurotoma?, that the present species ought not to be passed without notice. 



The outline of the outer lip, indented by the sinus, somewhat resembles the form 

 of the Greek letter zeta, from which circumstance the specific name is taken. 



Size. — Axis, estimated at 1 inch and 8-12ths; diameter, i inch. 



Locality. — Bracklesham Bay. 



No. 210. Pleurotoma t^eniolata. F. E. Edwards. Tab. XXX, fig. 13, a — c. 



P. testa angustd, elongato-fusiformi, sub-turritd, concentrice lineatd : spird elatd, 

 acuminata : anfractibus depresso-convexis, adhumeros taniold cinctis, injuventd tuberculatis; 

 marginibus posticis latis, concavis, obsolete regulariter sulcatis ; ultimo anfractu in canalem 

 longum prolongato ; lineis concentricis supra medias partes anfractuum elevatis, sub-dis- 

 tantibus, supra canalem minoribus, crebrioribus, fere obsoletis : aperturd oblongo-ovali ; 

 labro sub-aliformc, ad humerum prof unde sinuato. 



A long, narrow, fusiform, and somewhat turreted shell, spirally lined ; the spire 

 pointed and much produced, considerably exceeding the aperture in length ; the 

 whorls, seven or eight without the pullus, are flatly convex, separated by a deep and 

 very perspicuous suture, and girt round the shoulders by a narrow, slightly elevated, 

 ribbon-like band, giving to the shell an appearance of being obscurely keeled ; in 

 the young state the shoulders present a series of small, rather closely set, tooth- 

 like tubercles, which are lost in the later whorls. The posterior margins are concave, 

 and very wide, sometimes concealing the preceding whorl up to the shoulder ; the 



