The Cretaceous Fauna of Pondoland. 307 



spinose, and the lateral teeth are further removed from the 

 cardinals. 



Remarks. — Five specimens have been seen. The type is in the 

 Museum of the Geological Society of London. 



Caedium Griesbachi, sp. nov. 

 Plate XXXVII., figs. 3-5. 

 1871. Cardium denticulatum, Griesbach, Q.J.G.S., xxvii., p. 67, 

 pi. iii., fig. 12 [non Baily). 



Description. — Shell stout, inflated, oval, higher than long, only 

 slightly inequilateral. Anterior margin with a larger curvature than 

 the posterior margin. Ventral margin rounded. Posterior part of 

 the valve sloping rather more rapidly than the anterior part. 

 Umbones median, moderately prominent, curving inwards. 



Ornamentation consists of from 37 to 39 strong radial ribs. 

 Except on the posterior slope, the ribs are broad and rounded, but 

 sometimes slightly ridged, and they bear numerous, regular, trans- 

 verse ridges ; the ribs are separated by very narrow furrows. On 

 the posterior slope of the valve the ribs are narrower and have 

 angular summits, and the furrows are broader and sometimes have 

 a fine rib in the middle ; also the ridges on the ribs are less 

 distinct and more curved. Margin of valves with tooth-like 

 projections which are especially strong on the posterior margin. 

 Length 17 . 15 . 14 . 13 . 13 mm. 

 Height 21-5 . 19 . 16-5 . 16 . 15-5 „ 



Affinities. — -This species is similar in form to G. denticulatum, but 

 has rather less prominent umbones, and is easily distinguished by 

 the much broader and more rounded ribs, the narrower furrows, and 

 by the transverse ridges on the ribs. 



Remarks. — About 40 examples of this species have been examined, 

 all of which were of rather small size. 



The specimen of this species which was figured by Griesbach as 

 G. denticulatum, is in the Hamburg Museum. 



Genus PROTOCAEDIA, Beyrich. 



Protoc.\rdia HiiiLANA (Sowerby) var. 



Plate XXXVII. , fig. 6. 



In form, and in the general character of their ornamentation, the 



Pondoland specimens resemble P. Hillana (Sowerby)," of which the 



* Min. Conch., vol. i. (1813), p. -11, pi. xiv. 



24 



