G E N U S B U C C I N U M . 39 



40. BUCC1NUM UNI)OSUM,^%*Jr*e1 torn*. The Undulating 

 Buccinum. 



(Collect. MASS. LAM.) LIST., Conch., t. 938, fig. 33. 



PI. XII, % 41, a. b. c. c^VTW^- 4*0f 



B. test& ovato-biconica, crassiuscula, solida, albo-rufescente ; epidermi 

 fusca, villosa; anfractibus distinctis, transversim subnodulose plicatis,fusco 

 vel atro-rubescentibus, ultimo cseteris multo majore, longitudinaliter costu- 

 lato ; apertura ovato-elongata, albida, luteo margine; labro crasso, dentato, 

 inttis 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 striae, of a brownish or blackish red. 

 The intervals white, and furnished with very fine striae 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 

 BUCCINUM of Linnaeus, 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, 



