190 EOCENE MOLLUSCA. 
No. 124. Conus p1aApEMA, F. #. Edwards. Tab. XXIV, fig. 8 a—d. 
CoNUS DIVERSIFORMIS, Sow. (non Desh.) 1841. Min. Con., vol. vii, p. 26, t. 623, figs. 
Os14510. 
_ — Morris. 1843. Cat. Brit. Foss., p. 143. 
— i Sow. 1850. Dixon’s Geol., &c., of Suss., p. 108, t. 8, fig. 10. 
— — Morris. 1854. Cat. Brit. Foss., 2d edit., p. 244. 
C. testa conicd, oblongd, sub-turritd, coronatd, levi, ad basin transversim obscure 
sulcatd ; spird elevatd, sed trientem totius teste longitudine nequaquam equanti ; anfracti- 
bus numerosis, angulatis, marginibus posticis depressis, sub-cavatis, concentrice lineatis : 
apertura angusta ; labro mediocriter arcuato, postice late emarginato. 
Var. PYRIFORMISs (fig. 8 d). Testd spird depressd. 
Conus PyRiFoRMIs, Sow. 1850. Dixon’s Geol., &c., of Suss., pp. 108 and 189, t. 8, 
fig. 18. 
= — Morris. 1854. Cat. Brit. Foss., 2d edit., p. 244. 
A smooth, oblong, conical shell, with a turreted spire, formed of numerous 
(10—12) volutions, and moderately elevated, varying to some extent in different 
individuals, but never attaining a height equal to a third part of the length of the 
shell. The whorls are nearly straight on the sides, with the posterior margins much 
depressed, somewhat concave, and ornamented with four or five thickish, concentric, 
raised lines, separated by shallow, rounded furrows; the angles of the whorls present 
a series of oblong, regular tubercles, which are continued almost to the last whorl, 
when they are replaced by a rounded, cord-like thickening of the shoulder; the front 
part of the whorls is traversed by shallow, irregular furrows, which are effaced 
towards the middle part of the shell. ‘The aperture is narrow, with parallel margins ; 
the outer lip moderately arched, and presenting a wide, shallow curvature between 
the angle and the suture. 
The specimens separated by Mr. Sowerby, under the specific name pyriformis, have 
a much depressed spire associated with the tuberculation, and other characters which 
distinguish the present species, of which, therefore, | regard them as a variety only. 
The shells for which I propose the specific name, C. diadema, were referred by Mr. 
Sowerby, in part to C. deperditus (Brug.), and in part to C. diversiformis (Desh.). In the 
former species, however, the shell is narrower and more turbinate, with a more curved 
outer lip, and the tuberculation on the spire, where it occurs, is feeble and lost on the 
very early whorls; and in the latter species, M. Deshayes, in his description, states 
expressly that the angles of the whorls are somewhat sharp, and always simple ;* 
+ It is somewhat difficult to appreciate the distinct specific value of the shells constituting the species 
C. diversiformis, without an examination of a series of specimens equal to that upon the study of which 
M. Deshayes proposed the separation. To the unschooled eye they appear to be only broader forms of 
C. deperditus, with more variable spires. 
