196 Mr. T. H. Withers on some 



length of the valve from the apex ; the inner portions of 

 the valve are much less concave than in the rostrum. 



Carina! latas (Pi. YIII. fig. 16) obliquely triangular, almost 

 flat transveisely, with a strong median ridge extending from 

 the apex to the basal margin, apical portion slightly incurved, 

 basal margin convex. On the inner surface a ridge extends 

 from each basi-lateral angle to a point slightly over one- 

 third the length of the valve from the apex, and above this 

 ridge the gro-wth-lines meet on a median ridge which is 

 more strongly marked in this valve than in the other basal 

 latera. 



Subcarina (PI. VIII. fig. 21) triangular, almost symmetrical, 

 without a median keel, not so strongly convex transversely 

 as the rostrum, somewi)at constricted near the middle, with 

 the a'pical portion incurved and the basal margin straight. 

 On the inner surface a slight ridge extends from the apex 

 to a point nearly one-half the length of the valve from the 

 apex, and then to each basi-lateral angle. The upper 

 portions marked with growth-lines must have overlapped 

 each carinal latus. 



Peduncular plates (PI. VTII. figs. 22, 23). These are sub- 

 triangular, with rounded apex and rounded basal margin ; 

 slightly convex transversely, and slightly incurved. Outer 

 surface smooth, except for a few flatly rounded, transverse 

 ridges. On the inner surface the lower part of the valve is 

 smooth to a varying extent, the upper portion being marked 

 Avith gi'owth-lines, showing that this part of the plate over- 

 lapped the contiguous plates. 



Calantica {Sc'tllalepas) valida, Steeustrup, sp. 

 (Plate VIII. fig. 11.) 



1799. Bee de Secbe {Loligo cahnar), Faujas de Saint-Fond, B., 

 Histou"6 naturelle de la montagne de St. Pierre, p. 112, pi. xix. 



%. 1. 

 1802. Bek van Loligo cahnar (maar van eene onbekende soort), 



Traduction Hollandaise de Faujas par Pasteur, Natuurlijke Histoire 



van den St. Pietersberg-, p. loO, pi. xix. fig. 1. 

 1839. Pollicipes valichis, J. Steenstrup, Kr^ver's Naturliist. Tidsskrift, 



Bd. ii. p. 412, pi. T. figs. 28, 29, 29*, 31, 32 (non fig. 30V 

 1841. Pollicipes gracilis, F. A. Eoenier ; Norddeutsclien Kreidegeb. 



p. 104, pi. xvi. fig. 14. 

 1850. Pollicipes gracilis, Eoemer ; H. B. Geinitz, Das Quadersand- 



steingeb. p. 100. 

 18ol. Pollicipes validus, Steenstrup ; C. E. Darwin, Pal. Sec. Monogr. 



Fo.«s. Lepadidae, p. 68, pi. iv. fig. 2. 

 18ol. Pollicipes gracilis, F. A. Roemer ; C. I\. Darwin, torn. cit. p. 69, 



pi. iv. fig. 3. 



