156 EOCENE MOLLUSCA. 
apice acuto: anfractibus ventricosis, bind serie spinarum armatis ; spatio inter series con- 
cavo : apertura ovato-elongatd, in medio effusd, antice parum coarctatd ; labro tenui, simplict ; 
labio expanso, postice incrassato ; columelld leviter arcuatd, bis vel ter plicatd. 
Shell oblong, ventricose, longitudinally ribbed, transversely furrowed; spire 
moderately elevated, with a small poimted apex; the ribs, which are more or less 
numerous in different specimens, extend over nearly the whole length of the whorls, and 
terminate posteriorly in a row of erect, sharp spines. Close to the edges of the whorls 
rises a second row of smaller spines, the space between it and the suture forming a 
channel round the spire more or less deep, according to the height of the spines. The 
two rows of spines are connected by raised lines, and the intermediate space is concave: 
On the last whorl or two of the fully formed shell, the second row of spines frequently 
becomes obsolete, and is replaced by a sharp, elevated ridge. The furrows, in young spe- 
cimens, extend over the whole surface of the whorl, but, as the shell advances towards 
maturity, the posterior ones become faint, and at length are frequently almost obli- 
terated. The mouth is contracted in front, effuse near the middle, and deeply notched 
at the base. The outer lip is in all stages of growth thin, sharp-edged, and quite 
smooth within ; the columellar lip is moderately spread out over the body whorls, and 
thickened behind, and does not extend backwards beyond the suture. The columella, 
which is slightly arched, presents in the young state, two unequal, not very oblique 
plaits, in front of which a third obscure plait generally appears at maturity. 
Brander’s shell (fig. 65), referred by Solander to /. ductatriz, and by Lamarck to 
V. spinosa, presents nevertheless characters sufficiently distinct to entitle it, as Mr. 
Sowerby long ago suggested, to be considered as belonging to a separate species. In 
addition to the distinction afforded by the rows of spines, which are more equal 
and more permanent in this species than usual, it will be seen, on comparison with 
V. luctatria, that in V. Solandri the shell is shorter and broader, the spire not so much 
elevated, the outer lip always sharp edged, and without plication, the inner hp 
not so effuse, the columella arched, and the columellar folds neither so numerous nor 
so large; and, on a comparison with /. spznosa, that the shell is not so turbinate, the 
spire more elevated, and the whorls more ventricose. 
Size.—Axis, 2 inches nearly; diameter, rather more than | inch. 
Locality.— Barton. 
No. 94. VoxutTa scataris. Sowerby. Tab. XX, figs. 5 a—e. 
VouuTa scaLaris, Sow. 1843. Min. Con., vol. vii, p. 32; t. 625, fig. d—o. 
V. testd ovatd, ventricosd, antice attenuata ; spird elevatd, apice acuminato: anfractibus 
costatis, bind serie spinarum coronatis, transversim sulcatis, ad margines suturales depressis, 
inter series spinarum concavis ; costis numerosis ; sulcis sub-distantibus, equalibus: labro 
simplici, acuto ; labio parum expanso ; columella sub-rectd, triplicatd. 
