GIBBULA. 205 



T. varius LINX., Syst. Nat. xii, p. 3568. FISCHER, Coq. Viv., p. 

 259, t. 87, f. 2. PHILIPPI, Conchy 1. Cab., p. 191, t. 29, f. 8, 13. 

 HANLEY, Ipsa Linn. Conch., p. 318. BUQ., DAUTZ. ET DOLLFUS, 

 Moll, da Roass., p. 385, t. 46, f. 6-14. T. roissyi, PAYR., Moll, cle 

 Corse, t. 6, f. 13, 14. T. pallidus FORBES, Rep. JEg. Inv., p. 138. 

 T. elata BRUSINA, Conch. Dalm. Ined., p. .'6. T. gibbosula BRUS. 

 Contr. Fauna Dalmatia, p. 80. 



This form connects the preceding with the following group of 

 .species. It is less acuminate in the spire than G. umbilicaris, more 

 finely spirally striate, and with much more oblique aperture and ex- 

 panded umbilicus ; from G. richardi the flatter whorls and spiral 

 strife separate it. The periphery is sometimes rounded. 



G. PHILBERTI Recluz. PL 31, figs. 25, 26, 27. 



Shell small, umbilicate, conical, thin ; coloration very variable, 

 sometimes uniform dark brown or red, sometimes cinereous, longi- 

 tudinally clouded with brown, or with spiral series of blackish dots ; 

 spire low-conic, gradate ; sutures impressed ; whorls 6, a little gib- 

 bous just below the sutures, causing the spire to be somewhat 

 turrited ; whorls encircled by numerous fine unequal lirulse or stride ; 

 periphery obtusely angular ; base convex, generally a little more 

 coarsely lirate than the upper surface ; aperture subquadrangular, 

 oblique, not angled a: the junction of basal lip and columella ; col- 

 umella perceptibly arcuate; umbilicus large, funnel-shaped, white, 

 margined by one or several spiral riblets. 



Alt. 6-11, diam. 8-12, mill. 



Mediterranean Sea. 



T. philberti RECLUZ, Rev. Zoologique, 1343, p. 11. MONTEROSATO, 

 Conch, litt. MediL, p. 8. BUQ., DAUTZ. ET DOLLFUS, Moll. Mar. du 

 Itoiiss., p. 383, t. 46, f. 1-5. T. villicus PHILIPPI, Enum. Moll. 

 Sicll, ii, p. 152, t. 25, f. 14 and Conchijl. Cab., p. 194, t. 29, f. 17. 

 FISCHER, Coq. Viv., p. 258, t. 87, f. 1. 



A smaller species than the preceding, quite stable as to form, but 

 exhibiting great variation in the development of the spiral riblets. 

 Sometimes all are small, nearly equal, and sometimes several larger 

 ones are developed upon the upper surface. 



G. LEUCOPMA Philippi. PL 31, figs. 29, 30. 



Shell elevated-conical, slightly obtuse, umbilicata, spirally striate, 

 ashen, spotted and marbled with white, brown and black dots ; 

 whorls contiguous, flat, smooth, the last nngulated ; aperture sub- 



