26 FOSSIL CIRRIPEDIA. 
4. ScaLPELLUM mMaximuM, Tab. II. fig. 1—10. 
PoLLicipEs Maximus. J, Sowerby. Min. Conch., tab. 606, solummods, fig. 4 et fig. 6. 
N.B.—Fig. 3 est Tergum S. fossule, et fig. 5 alia species 
ignota. 
— MAxIMus. Steenstrup. Kroyer Tidsskrift, b. ui, pl. v, figs. 17, 18. 
— MEDIUS. Steenstrup. Kroyer Tidsskrift, b. ii, pl. v, figs. 13, 13*, 33. © 
— suLcatus. J. Sowerby. Min. Conch., pl. 606, fig, 2, sed non fig. 1 et 7. 
S. caring intra-parietibus instructd ; tecto subangulari vel subcarinato ; margine basah 
rectangulariter acuto ; told valvd plus minusve introrsum arcuatd, sed margine interno feré- 
recto ; tecto' transverse plus minusve convexo; superficie pené levi, striis paucis obsoletis 
longitudinalibus elevatis ; tectum, parietes, et intra-parietes inter se separantur costis plus 
minusve prominentibus. 
Carina having intra-parietes, with the tectum slightly angular or subcarinated, basal 
margin rectangularly pointed : whole valve more or less bowed inwards, but with the inner 
margin nearly straight ; tectum, in a transverse line, more or less convex; surface nearly 
smooth, with a few faint longitudinal raised striae; more or less prominent ridges separate 
the tectum, parietes, and intra-parietes from each other. 
Upper Chalk, Norwich (common), Mus. Fitch. Northfleet (single spec.), Kent, Mus. J. Sowerby. 
Upper Chalk, Charing, Kent, Mus. Harris. Scania, and Quedlingburg in Westphalia, Mus. University, 
Copenhagen. Cyply bei Mons, Belgium, Mus. Brit. Gehrden Hanover, oberer Kreidemergel, Mus. 
Dunker and Roemer. 
I have had far more difficulty in making up my mind regarding this the commonest 
cretaceous species, than with all the other fossil pedunculated cirripedes. From reasons pre- 
viously stated, I have in this genus, when only separate valves have been found, taken the ° 
carina as typical. Comparing ordinary specimens of the carina of Scalpellum maximum and 
var. sulcatum, such as those figured in the ‘Mineral Conchology,’ I should certainly have 
considered them quite distinct, had not an examimation of Mr. Fitch’s fine collection 
from Norwich, together with several other specimens, shown me that there are intermediate 
forms which it is scarcely possible to class. Again, had I not seen a particular carina of 
S. maximum var. cylindraceum, in which the upper part displays a different character from 
the lower in the same individual valve, I should have unhesitatingly received it as a 
species, instead of, as I now do with certainty, as a mere variety. I feel, moreover, very 
creat doubts whether the S. Zineatum be a species, or merely another variety of S. maximum ; 
1 For an explanation of this and all other terms, see the remarks on nomenclature and woodcuts in the 
Introduction, page 9 and 10. 
- BPR 
ay! 1 

