7(3 GENUS BUCCINUM. 



almost uniform, and the spots are only formed upon the upper 

 part of the whirls, instead of covering the whole surface of the 

 shell. See our plate 20, fig. 75. 



Specimens are also met with which are nearly black. Blain- 

 ville, in the Faune Frangaise, pi. 6, B, fig. 4-4A, has figured 

 this variety under the name of BUCCINUM Ascanias ; but the 

 description which he has added, p. 178, No. 15, by no means 

 belongs to the figure exhibited. We figure 'it, pi. 20, fig. 76. 

 Risso, in his work upon the productions of Southern Europe, 

 has formed from the varieties of this species, his PLANAXIS Beu- 

 dantiana, pi. 9, fig. 125 ; PLANAXIS lineolata, page 173, pi. 9, 

 fig. 136; PLANAXIS raricostata, p. 174, pi. 8, fig. 106. Da 

 Costa in his Catalogue des Coquilles de la Sidle, proposes to 

 unite the two species of Payraudeau, and to give the type species 

 the name of BUCCINUM elegans. As for us, we shall retain his 

 first name of BUCCINUM Cuvierii. 



77. BUCCINUM SCALARIFORME, VAL. The Stair-formed 



Buccinum. 



(Collect. MASS.) CHEMN., pi. 188, fig. 1808-1809? 



M f/ P1 . XXI> fig . 80 . 



B. testS. ovato-elongat^, subturrita,apice acuta, albida; anfractibus valde 

 convexis r rotundatis, longitudinaliter plicatis, trans versim tenuissim6 stria- 

 tis; apertura alba, pubrotundata ; labro dextro tenui, inttis striato; colu- 

 mella arcuata. 



Shell ovate, elongated, slightly turreted, pointed at the 

 summit ; spire composed of seven very convex rounded whirls, 

 united by a shallow suture. Upon the whirls are regularly 

 disposed longitudinal ribs or folds, crossed by numerous, fine, 

 approximate strise, which, by their mutual intersection, cover 

 the surface of the shell. Aperture white, and slightly rounded. 

 Right lip thin, striated internally ; columella arcuated, covered 

 by the left lip. The coloring is whitish, sometimes ornamented 

 with transverse bands. 



Length 14 lines. Width 7 lines. 



