PULMONATA. 147 
not proposed as possessing any value, except in so far as it may contribute towards 
he attainment of that end. 
+ 
Section A. Pullus small, conicul. 
a. WShell turbinate or pyriform ; costated or coronated ; 
inner lip effuse ; columellar plaits few. 
a. Transversely furrowed. 
No. 87. VoxLuTa LucTaTRix. Solander. Tab. XVIII, fig. 3. Tab. XIX, fig. 3 a—e. 
Lruineton THorney-RiBs, Petiver, 1764. Gazophylacium, t. 78, fig. 11. 
SrromBus Luctator, Solander, 1766. Brand. Foss. Hant., p. 30, figs. 64 and 67. 
— DUBIUS — — — fig. 68. 
VoLura MusicaLis, Webster, 1814. Geol. Trans., Ist ser., vol. ii, p. 204. 
—  tucrator Sowerby, 1816. Min. Con., vol. ii, p. 29, t. 115, fig. 1. 
—_ = = 1823. — vol. iv, p. 134, t. 397. 
V. testa elongato-turbinatd, costatd, transversim sulcatd, antice late emarginatda ; apice 
acuto : anfractibus superne concavis, angulatis, und serie spinarum, costas coronantium, dona- 
tis ; spinis brevibus, cuspidatis: aperturd in medio effusd, antice angustatd ; columella duas 
plicas obliquas proeminentes gerenti ; labro ad marginem crenulato, intus levi, in juventd 
sepe plicifero, tncrassato. 
Shell elongately top-shaped, contracted in front, longitudinally ribbed, transversely 
furrowed ; whorls angular at the shoulder, concave between the angle and the suture, 
and widely, but not deeply, notched in front; ribs sharp, curved, extending over nearly 
two thirds of the whorls, and crowned by a single row of erect, laterally compressed 
spines. In young shells the ribs are numerous, and a second row of small, irregular 
spines runs round the sutural margin; but the ribs become more distant, and the 
second row of spines disappears as the shell approaches maturity. The furrows are 
numerous, regular, rather broad and flat, and roughened by the prominent lines of 
growth. Spire elevated and pointed, the embryonic shell consisting of two or three 
very small, roundish, whorls ; aperture angular behind, effuse at the middle; columella 
round, nearly straight, furnished with two unequal, oblique, prominent folds towards the 
front, the anterior one of which is the larger, and generally with two or three smaller 
ones behind. The outer lip in the young shell thickened and frequently plicated within ; 
the plaits, however, when they do occur, disappear as the shell is enlarged, and in adult 
specimens the inner surface of the lipis smooth; in all stages of growth the outer lip 
is crenulated on the margin. Not infrequently, specimens occur in which the pearly 
matter, deposited by the margin of the mantle, remains ; it is spread over the front of 
the body whorl, extending backwards almost to the suture. 
Lamarck has cited Stromébus luctator (Brand., fig. 64) as identical with his VY. musicalis; 
