220 CRETACEOUS LAMELLIBRANCHIA. 
small secondary ribs at the summits of the primary ribs. I have not sufficient 
material to enable me to decide whether or not J’. trilinearis should be regarded as 
distinet from V. Studeri. 
Type.—In the Woodwardian Museum. 
Distribution.—Cambridge Greensand (derived from the Gault). 
VerLoprectEen prctinatus (Seeley), 1861. Plate XLII, fig. 6. 
1861. Hinnrres pectrnatus, H. G. Seeley. Ann. Mag. Nat. Hist., ser. 3, vol. vii, 
Pp ALLS), 
Remarks.—This form agrees with V. trilinearis m having very strong primary 
ribs, but seems to differ in that those ribs are more numerous and consequently 
closer together ; the secondary ribs at the summits of the primaries also appear to 
be better marked, and are crossed by distinct concentric ridges. 
T'ype.—In the Woodwardian Museum. 
Distribution.—Cambridge Greensand (derived from the Gault). 
VuLOPECTEN, sp. Plate XLII, figs. 7, 8. 
A few specimens from one of the nodule beds of the Gault of Folkestone 
agree with V. trilinearis (Seeley) in having relatively few main ribs on the left 
valve, and in the presence of secondary ribs at their summits, but the shell 
appears to be proportionately higher and shorter. 
Genus—Hunnites, Defrance, 1821. 
(‘ Dict. Sci. nat.,’ vol. xxi, p. 169.) 
Hiynires Favrinus, Pictet and Rouw, 1853. Text-fies. 6, 7. 
1845. Hinnires Leymert, 2. Forbes (non Deshayes). Quart. Journ. Geol. Soc., 
vol. 1, p. 250. 
1853. — Favrinus, F. J. Pictet and W. Roux. Moll. Foss. Grés verts de 
Gentve, pp. 503, 547, pl. xliii, 
fig. 2, pl. xliv. 
1854. == Leymertt, J. Morris. Cat. Brit. Foss., ed. 2, p. 169. 
1858. ~- Favrines, FJ. Pictet and HE. Renevier. Foss. Terr. Aptien (Matér. 
Pal. Suisse, ser. 1), p. 135. 
1865. — —_ H. Coquand. Mon. Aptien de Espagne, p. 155. 
