SCALPELLUM. 35 
Carina moderately bowed inwards, widening gradually downwards from the apex, 
of which a small portion is filled up solid, and must have projected freely; walls 
moderately thick; the two sides of the tectum are rather steeply inclined to each other, 
and meet in a-central line, which is subcarinated with a slightly prominent ridge; basal 
margin rectangularly pointed; parietes nearly flat, about as wide as the tecta, in some 
specimens perpendicular, so as not to be visible when the valve is viewed from a central 
dorsal point; in others, very steeply splayed outwards; separated from the intra-parietes 
by a conspicuous rounded ridge, and from the tectum by a nearly equally large ridge, 
which has generally one, two, or three fine, longitudinal, raised lines on either one or both 
sides of it: mm one specimen the whole surface was thus coarsely and obscurely lined. The 
intra-parietes are rather wide, extending to the basal margin of the parietes. Depth of 
valve, measured from the central crest to either inner edge, is about equal to the entire 
width, as measured from inner edge to edge. The depth compared with the width, 
though the most conspicuous character, varies a little. Inner edge of valve nearly straight. 
Length of longest specimen (in Mus. Bowerbank) 1:6 of an inch. This is the largest carina 
I have seen im any fossil cirripede. 
5. SCALPELLUM LINEATUM. ‘Tab. II, figs. 11 and 12. 
S. superficie tota carine liners tenuibus, rotundatis, longitudinalibus, proximis, microcos- 
copicis obtecta ; criste centralis costa crassiore ; costis duabus vel tridus tectum et parietes 
separantibus ; latitudine valve circa dimidium altitudinis equante ; intra-parietibus latius- 
culis, nullé costa conspicud a parietibus separatis ; apice solide repleto, aliquantulum liberé 
prominente. 
Carina with the whole exterior surface covered with fine, rounded, longitudinal lines, 
scarcely visible to the naked eye; with a thicker ridge on the central crest, and with two 
or three similar ones separating the tectum and parietes; width of valve about half of 
depth; subcarmated; iter-parietes rather wide, not separated by a conspicuous ridge 
from the parietes. Apex filled up, solid, and projecting freely a little. 
Lower Chalk of Sussex, Mus. J. Morris; Mus. J. Sowerby. 
I have seen two carine im the collections of Mr. Morris and Mr. J. Sowerby so exactly 
like each other, and having a somewhat different aspect from 8. maximum, var. sulcatum, 
to which they come nearest, that they deserve to be described, whether or not they are 
really specifically distinct. I long hesitated whether to give them a specific name, and 
have been, in some degree, influenced in doing so, from the presence of scuta and terga 
in the Lower Chalk, which indicate a distinct but closely-allied species. The scutum is in 
Mr. Morris’s collection, and came in the same lot with the carina from Sussex: the tergum 
