CUCULL^A. 55 



sidered that the form which is abundant at Donnington l was distinct. After a 

 careful comparison of a larger series of the latter with the type-specimen I am 

 unable to see any real difference. The figure given by Keeping is not quite 

 accurate in outline, and is drawn from a gutta-percha cast ; the mould itself is 

 not perfect at the anterior and ventral margins, and near the umbo a portion of 

 the shell remains in it. 



Types. — In the Woodwardian Museum, Cambridge, from Upware. 



Distribution. — Lower Greensand (black grit nodules) of Upware. Claxby 

 Ironstone (zone of Bel. lateralis) of Benniworth Haven, near Donnington. 

 Spilsby Sandstone of Donnington. 



Cucull/EA (Dk'Ranodonta ?) obliqua {Keeping), 1883. Plate XI, figs. 3 a—c, 4. 



1883. Pectunculus obliquus, W. Keeping. Foss., &c, Neoc. Upware and Brick- 

 hill, p. 116, pi. vi, fig. 1. 



Non 1826. — — Defrance. Diet. Sei. Nat., vol. xxxix, p. 224. 



— 1833. — obliqua, J. Lea. Contrib. Geol., p. 78, pi. iii, fig. 57. 



— 1835. — obliquus, O. Munster. Neues Jahrb. fur Min., &c, p. 438. 



— 1843. — — L. Reeve. Conch. Icon., vol. i, pi. vi, fig. 33. 



Description. — Shell stout, ovate-oblong, inequilateral, moderately convex but 

 flattened centrally. Anterior border rounded, ventral slightly curved, posterior 

 oblique and slightly curved — forming with the ventral a blunt angle. Shell com- 

 pressed dorsal to a line from the umbo to the postero-ventral angle. Umbones 

 small, rather close together. Hinge-line short. Hinge-area narrow, with many 

 ligament-grooves. Surface of shell with fine radial striae and a few fairly well- 

 marked lines of growth. Central teeth few, small ; the laterals (two or three) 

 long, the first parallel to the hinge-margin, but the last curving ventrally. 

 Measurements : 



(1) (2) 



Length 10 . 20 mm. 



Height 13 1775 „ 



Thickness 10 . — 



Affinities. — This form was referred by Keeping to Pectunculus, but the character 

 of the teeth show that it cannot be placed in that genus. The concluding 

 remark of the author mentioned (" It approaches nearest to some Jurassic species 

 from the Great Oolite aud Coral Rag") seems to show that he was really thinking 

 of Gncullsea rather than Pectunculus. The fact that the lateral teeth (or some of 



1 Erroneously spelt Do<Wington by Keeping (' Foss. Upware,' &c), p. 153. 



