PROSOBRANCHIATA. 219 



proportionately shorter than in the type, and the whorls are slightly angulated 

 at the shoulders. 



Much confusion exists among several of the Continental authors with respect to 

 this species, in consequence of the shell figured as P. rostrata in ' Mineral Con- 

 chology' having been considered by them as distinct from the Murex rostratus of 

 Solander, although Mr. Sowerby cites the latter as a synonym. Thus M. de Koninck 

 has described a pleurotoma from Basele and Boom, which he has referred to 

 P. rostrata of Sowerby, but without having cited Brander's figure ; and this pleurotoma, 

 Nyst, after stating that it differs essentially from Murex rostratus, but that it is without 

 doubt Sowerby's P. rostrata, regards as merely a variety of P. Selgsii (De Kon.), to which 

 latter species he refers it. The same author subsequently describes another species, 

 from Basele, Boom, &c, as identical with Brander's shell, but he excludes P. rostrata of 

 Sowerby. The description given by M. de Koninck agrees tolerably well with the 

 present species ; but, assuming that the shells described by that author belong, in fact, 

 to the same species as those represented by Nyst (P. Selgsii, t. 40, fig. 1 1 and P. ros- 

 trata, t. 42, figs. 2, 3), I do not think that any one familiar with the English shells can 

 regard either of them as identical with the species figured by Brander, and described 

 by Sowerby. Philippi has recorded a single specimen from Gorzig, in the Museum at 

 Halle, which he has referred to the present species. This author, however, has not 

 given either figure or description, and as, under the circumstances to which I have re- 

 ferred, the accuracy of this identification cannot be assumed, I have cited Philippi 

 with a query. At present there appears to be every reason for believing that the true 

 P. rostrata of Solander is confined to the upper beds of the middle eocene forma- 

 tions of England ; and, although Mr. Morris gives Highgate and Sheppey as localities, 

 I am not aware of its occurrence at either of those places, nor even at Bracklesham 

 Bay, which is also given as a locality by the same author. 



Size. — Axis, rather more than 4^ inches ; diameter, not quite 1 inch. 



Localities. — Barton, Alum Bay (No. 29, Prestwich), and Highcliff. 



No. 145. Pleurotoma Keelei, F. E. Edwards. Tab. XXVI, fig. c. 



P. testa fusiformi, turritd, tuber culatd spiraliter fasciatd ; spird elevatd, acuminata: 

 anfractibus convexis, ad humeros angulatis, unicd serie tuberculorum spiniformium munitis ; 

 marginibus posticis latis, concavis, concentrice lineatis, adsuturas crenulatis ; ultimo anfractu 

 turbinalo, in canali longo exeunti ; fasciis spiralibus, irregularibus, inaqualibus, fasciis 

 crassis cum aliis tenuibus alternantibus : aperturd oblongo-ovali ; labro valde arcuato, sinu 

 mediocriter lato pro/undo, in margine collocato. 



Shell fusiform, turreted, tuberculated, spirally banded ; the spire much elevated, 



