CERION, GROUP VII. 225 



b*. Shell more slender, with very weak parietal callus and 

 small parietal lamella or none. 



C. m. chrysalis, p. 226. 



. INFANDUM ( Shuttlw.' Poey). PI. 31, figs. 92, 93, 94. 



Shell deeply rimate, very solid, cylindric, white. The lower 2 or 

 3 whorls sculptured with rather strong riblets separated by wider, 

 often quite wide and unequal intervals ; the rest of the whorls smooth, 

 except that a few post-nepionic whorls usually are sharply and min- 

 utely striate. Whorls usually 11 to 12, nearly flat, the last ascend- 

 ing, excavated behind the columellar lip. Aperture large, light 

 brown within, the parietal lamella quite long, axial lamella small, 

 Peristome very broady reflexed, revolute, with convex face. Parietal 

 callus rather heavy. 



Length 43, diam. 14 mill. (type). 



Length 47, diarn. 14 mill. 



Length 39, diam. 13^ mill. 



Cuba: Prov. Matanzas, at Punta Gorda (Arango). 



Pupa mumia var. P PFR., Malak. Blatter, 1854, p. 208, pi. 3, f. 

 4, 5 ; Monogr. iv, p. 656. P. mumia SOWB., C. Icon. f. 36. Pupa 

 decumana Fer., POEY, Memorias, i, p. 396. Pupa infanda Shuttl., 

 POEY, Mem., ii, pp. 29, 60 ARANGO, Fauna Mai. Cubana, p. 100. 

 PFR., Monogr., vi, p. 288. SOWB., C. Icon., pi. 2, f. 11. Cerion 

 infandum P. and V., Proc. A. N. S. P., 1896, p. 321. 



Some specimens of a small form before me (fig. 94) measure 27x11, 

 and 31^x12 mill., and have 9 or 10 whorls, agreeing otherwise with 

 the large form. 



C. MUMIA (BruguiSre). PI. 31, figs. 95, 96. 



Shell rimate and perforate, cylindrical, solid and strong; rarely 

 uniform white, but usually gray-brown, profusely speckled or zigzag- 

 speckled and maculate with white. Whorls about 12, moderately 

 convex, sculptured with strong but narrow, rather oblique ribs, sep- 

 arated by wide and often unequal spaces on the lower 4 whorls, 

 which are of about equal diameter; the ribs closer and more regular 

 on the cone, which is usually rather short and (except the first 

 whorl), sculptured throughout. Aperture brown inside, the parietal 

 lamella deeply placed rather strong and long. Axial lamella small, 

 dentiform. Peristome flaring, broadly reflexed and revolute, with 

 convex, brown-tinted face; parietal callus moderately heavy at the. 

 edge, or rather thin. 



