56 University of Michigan 



2M) ; iu synonymy. C. proteiis "Beck" Pfr. (I.e.); in synonymy. 

 C. cancellatum "Menke" Pfr. (I.e.); very large, light-colored female 

 (cf. 1847; Chemn., II, fig. ix-15, 16, 17). 



Tj'pe locality: unknown; probably the Schaarlo, back of 

 Willemstad, Curagao (C5c). 



Distribution of species: Curasao; western side, from 

 Spaansche Baai to Kaap Sint Marie; eastern side from south 

 of Sint Joris Baai to north of Landhuis Hato (at least) ; nar- 

 rowly invades central region of older rocks. 1,911 specimens 

 collected. 



Distribution of subspecies : Curagao ; western side from 

 Sint Anna Baai to Caracas Baai (C4, 5) ; intergrades with 

 other subspecies to north and south. Under limestone rocks 

 and on trees and brush; subarboreal, but not so much so as 

 the species of Tudorata; does not penetrate the region of the 

 older rocks to any great extent. 714 specimens collected. 



Shell (fig. xiii-A) : subacuminate (with concave lateral out- 

 lines) ; obovoid-conic ; quite solid. Ground color: whitish to 

 pinkish and dull amber; spiral bands present or absent, con- 

 tinuous or broken; blotches rarely unite to form irregular 

 bands parallel to growth lines; eroded apex and apical plug 

 from almost white to orange-red and purplish black.^^ Whorls : 

 about 71/2) of which 4 are usually retained; quite convexly 

 rounded and with well marked suture; last whorls increase 

 more rapidlj^ in diameter than the earlier ones. Sculpture of 

 last whorl : growth threads regular, closely spaced to con- 

 tinuous, low and rounded; spiral sculpture present (typical 

 megacheilos) to absent (form desculpta new; fig. xiii-B; 

 x-34) ; when present it consists of few to numerous, low, 

 rounded thickenings. Earlier whorls: similar to last whorl. 

 Subapical whorls (young shells) : almost as slender as in 

 T. (lurnniia {i.e., with similar apical angle) ; with well-devel- 

 oped, widely-spaced, growth lamellae and low, angular, spiral 

 ridges. Umbilicus: of medium size, but almost hidden by 

 peristome. Aperture: large, ovoid, with long axis at about 



38 1923; Occ. Papers Mus. Zool. Univ. Mich., no. 137, p. 3. 



