GIBBULA. 199 



Cab., p. 229, t. 34, f. 17. FISCHER, Coq. Viv., p. 126, t. 43, f. 3. 

 Trochus aeyyptius KIENER, Species, gen. Trochus, t. 43, f. 3. 

 Monodonta aegyptiaca LAMARCK, An. s. Vert., vii, p. 33. 



Type of the subgenus Forskdlia H. and A. Adams. This species 

 and the following are separated from all others by the scalariform 

 spires, strongly plicate upper surface, and the deep channel en- 

 circling the periphery. These characters are only an exaggeration 

 of those of Gibbula magus. It is inadvisable to give a subgeneric 

 name to so slight a divergence. 



G FANULUM Gmelin. PI. 63, figs. 10, 11. 



Shell umbilicate or perforate, conical, solid, whitish, radiately 

 maculated above, dotted beneath with red or rich brown; spire 

 conical, acuminate, somewhat scalariform ; whorls about 7, very 

 convex, spirally lirate, radiately costate above, bicarinated at the 

 periphery, and encircled by a deep canal; base convex, bearing 

 about 5 spiral line ; aperture oblique, rounded, columella sinuous in 

 the middle (not concave, nor dentate at the base as in G. declivis), 

 arcuate above ; umbilicus broad and funnel-shaped, or narrow and 

 almost closed. Alt. 15-19, diam. 14-17 ; alt. 14, diam. 15 mill. 



Mediterranean and Adriatic Seas. 



T.fanulam GMEL., Syst. Nat., xiii, p. 3573. PHILIPPI, Conchyl. 

 Cab.", p. 228, t. 34, f. 16. FISCHER, Coq. Viv., p. 125, t. 43, f. 1. 

 BUQUOY, DAUTZ. ET DOLLFUS, Moll. Mar. du Rouss., p. 370, t. 44, 

 f. 12-16. And of authors generally. Monodonta cegyptiacaPAYR., 

 Moll, de Corse, t. 6, f. 26, 27 (not of Lam.). T. tuber culatusRisso, 

 Hist. Nat. Ear. Mcrid., iv, p. 128, t. 9, f. 133. 



Easily recognized by the turrited, acuminate spire and the deep 

 peripheral groove, which is narrower than in G. declivis, and lacks 

 the central riblet. Several varieties (lutea, nigra, rubra, albo-sordida 

 and varia, all of Scacchi) have been founded upon color muta- 

 tions, the shell being subject to the same variations in hue as G. 

 magus. 



The altitude is equal to, or greater or less than the diameter. 



G. GUTTADAURI Philippi. PL 31, figs. 44-46. 



Shell small, umbilicate, conical, whitish, irregularly maculated 

 with reddish brown or purplish above, dotted beneath ; whorls 6, 

 turrited, very convex, the apex acute, encircled by three strong 

 ribs, one on the periphery, the others above it, the interstices 



