180 CERION, GROUP I. 



Subgenus CERION, s. str. 



Remarkable for the position of the parietal lamella, in the angle 

 where the columella joins the whorl. The internal sets of laminae or 

 teeth sometimes persist in mature shells, but as often are absorbed 

 and absent, as in other groups of the genus. 



C. UVA (Linne). PI. 33, figs. 41-45. 



Shell cylindric or wider above, rather solid, white, lustreless. 

 Whorls 10 J to 13J, the earlier 2J nearly smooth, the rest regularly 

 and strongly ribbed, the ribs as wide as their intervals or narrower, 

 oblique and curved on the upper part, becoming nearly straight and 

 less oblique below. Last 5 or 6 whorls of nearly equal width, form- 

 ing the cylindric portion, those above rapidly tapering forming a 

 short obtuse cone. Last whorl tapering below, the ribs often obso- 

 lete there. Umbilical chink deep. Aperture ovate or rounded, 

 white or liver-brown within, having a small obtuse and very short 

 lamella at the junction of the columella and parietal wall, and a sub- 

 obsolete or scarcely perceptible columellar fold, which becomes 

 stronger within, and winds up the internal column for 3 to 5 whorls. 

 In many specimens the cavity of the whorls is contracted at one or 

 more intervals by pairs of lamellae on the roof and floor of the cavity, 

 a stronger development of the columellar lamella occurring at these 

 places. Internal column wider and hollow above, narrow and solid 

 in the lower 4 whorls. 



Length 25^, diam. 9^, longest axis of aperture 7 J mill. 



Length 24, diam. 10J, longest axis of aperture 1\ mill. 



Length 20, diam. 10, longest axis of aperture 7 mill. 



Length 16, diam. 9, longest axis of aperture 6 mill. 



Island of Curacao. 



Turbo uva L., Syst. Nat. (10), p. 765. GMEL., p. 3604 Buli- 

 mus uva BRUG., Encycl. Meth. p. 349 Helix (Cochlodonta} uva 

 FER., Prodr., p. 58, no. 458 ; Histoire, pi. 153, f. 11-14 Pupa uva 

 LAM., An. s. Vert, vi, pt. 2, p. 105; edit. Desh., viii, p. 169. 

 KUSTER, Conchyl. Cab. p. 5, pi. 1, f. 3, 4. SOWERBY, Conchol. 

 Man., p. 291; Conch. Icon. pi. 1, f. 7 DESH., in Fer., Hist., p. 



206. PFR., Monogr. ii, 317; iii, 537; iv, 659; vi, 292 WIRT 



ROBINSON, A Flying Trip to the Tropics, p. 22, figs SEMPER, 

 Reisen, Landmoll., p. 128, pi. 16, f. 11 (teeth) Cerion Apiarium 

 BOLT., Mus. Boltenianum p. 90 (1798). 



