CERION, GROUP I. 181 



Cerion uva MORCH, Catal. Yoldi, p. 33. DALL, Bull. M. C. 

 Zool. xxv, no. 9, p. 121, pi., f. 3. PILS. & VAN., Proc. A. N. S. 

 Phila. 1896, p. 318, with var. desculptum, pp. 318, 328, pi. 11, f. 1. 



A very abundant shell in Curacao, easily recognized by the obtuse 

 apex, strong costation, and the position of the parietal lamella in the 

 angle at the root of the columella. It varies notably in size and 

 contour, and in the development of internal lamella?, of which there 

 may be as many as three sets, or none at all. Young shells fre- 

 quently show this armature, which recalls that of Gastrodonta or 

 Dibothrion. 



Figure 42 is a normal, average specimen. 

 Var. desculptum Pilsbry & Vanatta. PL 33, fig. 46. 



Shell similar to C. uva, but differs in the smooth shell, lacking the 

 strong, regular ribs characteristic of that species, or having them 

 very few, weak and irregular. 



Alt. 22, diam. 9 ; apert. alt. 7J, width 6j mill. 



Alt. 19, diam. 9 ; apert. alt. 7, width 6 mill. 



A sectionized specimen shows no internal sets of laminae, but these 

 are frequently wanting in specimens of the typical C. uva. Types 

 are from Curacao. 



Subgenus STROPHIOPS Dall. 



Strophiops DALL, Bull. Mus. Comp. Zool., xxv, no. 9, p. 121 

 (October, 1894); type " Pupa decumana Fer. = C. regium Bens 

 Maynardia DALL, /. c. (type S. neglecta Mayn.). Seniculus MAY- 

 NARD, Contributions to Science, III, p. 17 (1896), type S. mumia 

 Brug. Umbom's MAYNARD, t. c., p. 28, type S. scalarina Gundl. 

 Pinguitia MAYNARD, t. c., p. 30, type S. " dimidiatia " Pfr. Longi- 



dens MAYNARD, t c., p. 39, type pannosa Mayn Multostrophia 



MAYNARD, Contributions to Science, II, p. 177 (1894), type S. ex- 

 imea Mayn. 



The parietal tooth is situated at or near the middle of the parietal 

 wall, and may be either short or moderately long, penetrating some- 

 times a half-whorl inward. It is sometimes reinforced by a callous 

 deposit or smaller tooth near its outer end on the side towards the 

 columella, but is otherwise continuous and simple. Axial lamella 

 deeply penetrating. The cavity of the whorls is rather ample, and 

 not obstructed within by denticles in the adult shell. Type C. regium 

 (Bens.). 



