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 J/wrev rostratus, but that it is without 
doubt Sowerby’s P. rostrata, regards as merely a variety of P. Selysii (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. Selysiz, t. 40, fig. 11 and P. ros- 
trata, t. 42, figs. 2, 3), 1 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 43 inches; diameter, not quite 1 inch. 
Localities—Barton, Alum Bay (No. 29, Prestwich), and Highcliff. 
No. 145. Preuroroma Kegxet, F. £. Edwards. Tab. XXVI, fig. 6. 
P. testé fusiformi, turritd, tuberculatd spiraliter fasciatd ; spird elevatd, acuminate : 
anfractibus conveais, ad humeros angulatis, unicd serie tuberculorum spiniformium munitis ; 
marginibus posticis latis, concavis, concentrice lineatis, ad suturas crenulatis ; ultimo anfractu 
turbinato, in canali longo exeunti; fasciis spiralibus, irregularibus, inequalibus, fasciis 
crassis cum aliis tenuibus alternantibus : apertura oblongo-ovali ; labro valde arcuato, sinu 
mediocriter lato profundo, in margine collocato. 
Shell fusiform, turreted, tuberculated, spirally banded; the spire much elevated, 
