26 FOSSIL CIRRIPEDIA. 



4. SCALPELLUM MAXIMUM, Tab. 11. fig. 1 — 10. 



PoLLiciPES MAXIMUS. /. Sowerbij. Min. Conch., tab. 606, solummodo, fig. 4 et fig. 6. 

 N. B. — Fig. 3 est Tergum S". fossulce, et fig. 5 alia species 

 ignota. 



— MAXIMUS. Steenstrup. Kroyer Tidsskrift, b. ii, pi. v, figs. 17, 18. 



— MEDius. Steenstrup. Kroyer Tidsskrift, b. ii, pi. v, figs. 13, 13*, 33. 



— SULCATUS. J. Sowerbij. Min. Conch., pi. C06, fig. 2, sed non fig. 1 et 7. 



5. carina inira-parietibus instrudd ; tedo suhangidari vd subcarinato ; margine basali 

 redangulariter acuto ; totd v aha plus minusve introrsum arcuatd, sed margine inferno fere- 

 redo ; tedo ' transverse plus minusve convexo ; superfine pcene lavi, striis pauds obsoletis 

 longitudinalilms elevatis ; tectum, parietes, et intra-parietes inter se separantur costis plus 

 minusve promnentibus. 



Carina having intra-parietes, with the tectum shghtly 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), Miis. Fitch. Northfleet (single spec), Kent, Mus. J. Sowerby. 

 Upper Chalk, Charing, Kent, Mus. Harris. Scania, and QuedHngburg in Westphalia, Mus. University, 

 Copenhagen. Cyply bei Mons, Belgium, Mus. Bi'it. 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 examination 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 

 great doubts whether the 8. lineatum be a species, or merely another variety of S. maximum ; 



^ For an explanation of this and all other terms, see the remarks on nomenclature and woodcufs in the 

 Introduction, page 9 and 10. 



