GENUS BUCCINUM. 39 
40. BUCCINUM UNDOSUM, Qvoy et Gaim. The Undulating 
Buceinum. 
(Collect. Mass. Lam.) Lasrt., Conch., t. 938, fig. 33. 
Pl. XII, fig. 41, a. b.c. 
B. testA ovato-biconica, crassiuscula, solidd, albo-rufescente ; epidermi 
fusca, villosa; anfractibus distinctis, transversim subnodulose plicatis, fusco 
vel atro-rubescentibus, ultimo ceteris multd majore, longitudinaliter costu- 
lato; apertura ovato-elongata, albidd, luteo margine; labro crasso, dentato, 
intus striato; columella callosa. 
Shell ovate, bi-conic, quite thick, solid, of a reddish white, 
and covered with a brown, velvety epidermis; the whirls 
moderate, pretty distinct, six in number, and provided with 
decurrent, subnodulous striz, of a brownish or blackish red. 
The intervals white, and furnished with very fine strie scarcely 
apparent ; the lowest whirl much larger than all the others 
together, and having five or six thick, obtuse longitudinal folds 
or ribs, which are rarely continued as far as the base of the 
shell, and oftentimes form only tubercles, particularly in old 
shells. Aperture ovate, elongated, whitish, bordered with 
yellow ; canal slightly prolonged, emargination slight and 
oblique. The lip, which is thickened by age, is denticulated 
throughout its whole length, and furrowed internally. Colu- 
mella wrinkled, covered at its base with a thin, raised callosity. 
Length 1 inch 9 lines. Width 1 inch. 
Inhabits the Straits of Malacca, and the coasts of the Isle of 
France. | 
A single character observed in this shell, that of the margin 
on the right lip, led Lamarck to withdraw it from the genus 
Buccrnum of Linneus, to make his Buccinum-formed Triton ; 
but this margin is too imperfectly formed in all the specimens of 
this species to justify any such separation. This shell presents 
a great number of varieties ; the longitudinal ribs are sometimes 
slightly marked, or do not exist ; at other times, on the contrary, 
