LAMELLIBRANCHIATA. 115 



CUCULL.EA SUBNANA, Pictet and Roux. 

 (Plate v., fig. 10.) 



Area subnana, Pictet and Roux, 1852, Moll. Foss. grts verts, p. 



461, pi. XXXVL, f. 6. 



Pictet and Campiche, Pal. Suisse Terr. Crd., 

 St Croix, p. 466. 



Near to the common Atherfield species, C. Cornueliana, D'Orb., 

 but distinguished by wanting the ridge which always passes ob- 

 liquely along the middle of the posterior area in that species. 



It is distinguished from C. nana by its ligament furrows. 



Our shell is double the size of the figured types. 



Localities. Upware, Farringdon. 



S. Europe. Perte du Rhone, Gault ; St Croix, Lower Gault. 



GUCULL^EA, sp. ? 



(Plate v., fig. 8.) 



A somewhat similar shell to the last, but more oblique a 

 cuneiform shell. The umbo is not prominent, hinge rather short, 

 hinge area small. The radiating striations are very delicate, for 

 the most part obscure. 



I only know of one specimen (Woodw. Mus.), and this seems to 

 be partly decorticated. 



Measurements. Transverse diameter, 25mm.; depth, 19 mm.; 

 umbo to posterior angle, 21 mm. 



Locality. Upware. 



PECTUNCULUS SUBL^VIS, Sby. 

 (Plate v., fig. 9, a, b, c.) 



Pectunculus sublcevis, Sowerby, 1824, Min. Con., pi. CCCCLXXH., 

 f. 4. 



The umbo is narrower and less elevated than is usual in this 

 species, and the ribs are broad and flattened. 

 The ribs vary in this species. 

 Localities. CJpware, Blackdown, Shanklin, I.W. 



82 



