70 SUPPLEMENT TO GREAT OOLITE MOLLUSCA. 
Cornbrash of Scarborough, in which rock it is rare. The lower grit of the upper portion 
of the Inferior Oolite at Rodborough Hill, near Stroud, has produced a considerable 
number of specimens, for the most part smaller, and sometimes more nearly equilateral ; it 
also occurs in the same position at Leckhampton Hill; at each of these Inferior Oolite 
localities it is associated with a larger, more lengthened, aud more depressed species, 
(C. complanata, Lyc.). Corbis depressa, Desh., from the Oxfordian strata of Viel, 
St. Remy, approaches nearly to it in the general outline, but is more depressed and some- 
what less ovate, 
CorBICELLA suBANGULATA, Zyc. Tab. XL, fig. 9. ° 
Testa ovata sub-compressa, transversa, umbonibus antemedianis, mediocri magnitudine, 
margine cardinali oblique declivi, latere postico angulo oblique instructo, margine antico 
subconcavo, superficie plicis incrementi magnis irregularibus. 
Shell ovate, somewhat depressed, transverse ; umbones of moderate size, placed anterior 
to the middle of the valves; hinge-border of moderate length, sloping obliquely down- 
wards ; the posterior side has an oblique angle; the anterior border is slightly concave ; 
the surface has numerous plications of growth, which become large and irregular towards 
the lower border. 
Allied to C. complanata, Lyc., from which it is distinguished by the strongly marked 
posterior angle, and by the larger umbones ; our specimen is imperfect at the posterior 
extremity. 
Geological Position and Locality. The Forest Marble of Laycock ; in the collection 
of W. Walton, Esq. 
Cyprina Isuipensis, Lye. Tab. XXXV, fig. 13. 
Testa ovato-transversa, convexa, levi, obliqua, umbonibus antemedianis magnis, 
encurvis, lunula magna, excavata, area parva lanceolata ; latere postico compresso, angulo 
obliquo formante; basi elliptica curvata; striis concentricis tenuibus, trregularibus, 
subobsoletis. 
Shell ovately transverse, convex, smooth, oblique; umbones large, incurved, placed 
anterior to the middle of the valves; area small, lanceolate ; posterior side compressed and 
slightly concave, forming an oblique and well-defined angle with the other portion of the 
surface ; lower border curved elliptically, forming an angle at its junction with the posterior 
border. Nearly allied to Cyprina Loweana, Mor. and Lyc., from which it is distinguished 
by the larger umbones; larger lunule, by the posterior flattened or concave area, and by 
the well-defined oblique and acute angle, which renders the posterior extremity some- 
what rostrated. 
