s 
40 FOSSIL CIRRIPEDIA. 
Carina smooth; parietes extremely narrow, rectangularly inflected ; tectum sub-cari- 
nated, in a transverse line moderately arched ; basal margin rectangularly pointed. 
Lower Greensand, Maidstone. Mus. J. Morris. 
I know this species only from a single carina, which is chiefly characterised by its 
simplicity : it is, I think, certainly distinct from all the others. In the sides of the carina 
being simple, that is in not being divided by a ridge into parietes and intra-parietes, it 
comes nearest to S. arcuatum and trilineatum, from the former of which it is readily distin- 
guished by its smoothness; and from S. ¢relineatum by the absence of the three ridges. 
This species possesses some interest, as being the oldest cirripede, which I have ventured 
to attribute to the genus Scalpellum. Carina moderately tapering, slightly bowed towards. 
the terga; sub-carimated, but with the central ridge smooth; transversely moderately 
arched; basal margin rectangularly pomted; the whole surface is smooth. Parietes 
extremely narrow, rectangularly inflected, set mwards, not extending down to the basal 
margin, with the lines of growth almost parallel to the inner edges of the valve. 
11. ScatpeLuum arcuatum. Tab. I, fig. 7. 
S. valvarum lineis angustis elevatis ab apice radiantibus : carine tecto transverse leniter 
arcuato, et parietibus rectangulé inflexis, leniter concavis, levibus. 
Valves with narrow elevated lines radiating from their apices. Carina with its tectum 
in a transverse line flatly arched, and with the parietes rectangularly inflected, slightly 
concave, smooth. 
Gault, Folkstone, Mus. Bowerbank, J. Sowerby, Flower. Var. in Grey Chalk, Dover, Mus. Brit. 
Pliner (Chalk-marl) near Hildesheim. Mus. Roemer. 
I have ranked this species under Scalpellum instead of Pollicipes, from the somewhat 
greater resemblance of its scuta and carina with the fossil species of Scalpellum, than 
with any known Pollicipes; though in some respects it appears rather intermediate. 
This species appears to come nearest to the Pollicipes radiatus of J. de C. Sowerby in 
‘Geol. Trans.,’ vol. iv, 2d Series, Pl. XI, fig. 6, but besides that that species comes from 
the Lower greensand, the lower angle of its tergum is much more pointed; the upper 
figure of the two there given appears to be something wholly different. From the state of 
the specimens, I believe that the three following valves, all in Mr. Bowerbank’s collection, 
belonged to the same species. 
General Appearance. Carina, scuta, and terga plainly marked with prominent, very 
narrow, straight ridges, radiating from their apices; the interspaces between these ridges are 

