VELOPECTEN. 219 
side other ribs (sometimes four or five) are introduced; these are usually smaller, 
and may be quite close together, but in old specimens they become widely 
separated ventrally. Both ribs and furrows are crossed by numerous fine, close- 
set, regular, concentric ridges. Anterior ear with about seven primary and seven 
secondary ribs. Posterior ear smaller and more distinctly limited. 
Affinities.—Hinnites Salteri, Seeley, from the Red Limestone of Hunstanton, is 
founded on a portion of the left valve; it appears to me to be only a large example 
of V. Studeri, in which the main ribs are less prominent than usual owing to the 
abrasion of the shell. See also V. trilinearis (below). 
Remarks.—The state of preservation of the examples of this species varies con- 
siderably, but is usually rather unsatisfactory. In the specimens from Warminster, 
where the species appears to be rare, the shell is preserved, and the ornamentation 
is very well shown, but in those from Folkestone the shell has usually disappeared. 
The examples from the Cambridge Greensand are internal casts in phosphate, in 
which there is no trace of the ears, and whilst some of the principal ribs are shown 
the details of the ornamentation are wanting. ‘The specimens from the Red Lime- 
stone of Hunstanton are usually considerably larger than those from the Cambridge 
Greensand, and have the shell preserved in part at any rate; in some cases the 
fine ornamentation is clearly shown, but often it is indistinct owing to the outer 
layers of the shell having disappeared ; in these large forms the main ribs become 
much less strong near the ventral margin, or, in some cases, almost in- 
distinguishable. 
T'ypes.—F rom the Gault of the Perte du Rhéne. The type of Hinnites Saltert, 
Seeley, from the Red Limestone of Hunstanton, is in the Woodwardian Museum, 
Cambridge. 
Distribution—Upper Gault (zone x) of Folkestone. Cambridge Greensand 
(derived from the Upper Gault). Red Limestone of Hunstanton. Upper Greensand 
of Warminster. 
VELOPECTEN TRILINHARIS (Seeley), 1861. Plate XLII, fig. 5. 
1861. Hiynires rrininearis, H. G. Seeley. Ann. Mag. Nat. Hist., ser. 3, vol. vii, 
p. 119, pl. vi, fig. 2. 
1866. — — var., Seeley. Ibid., vol. xvii, p. 178. 
Remarks.—The form named Hiniites trilinearis by Seeley was founded on a few 
imperfect specimens from the Cambridge Greensand. They seem to differ from 
the English examples of V’. Studeri in having the primary ribs on the left valve 
stronger and more widely separated, but they approach very closely some of the 
specimens of that species figured by Pictet and Campiche, especially in having 
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