274 CERION, GROUP XIII. 



Specimens measure: 23Jx9 mill.; 20x8f mill.; 17x7 mill. The 

 brown or white lip is somewhat more thickened than usual in C. 

 bryanti. 



As to the genesis of this set of shells, I am much inclined to be- 

 lieve it an independent stock which has arisen from C. rubicundum 

 by degeneration of the lamellse, and in this feature has converged to 

 the condition of bryanti. The specimens are from the Robert Swift 

 and H. D. Van Nostrand collections, in that of the Academy. 



C. RUBICUNDUM (Menke). PI. 45, figs. 86-90. 



Shell very shortly rimate, solid, cylindric or pillar-shaped, white, 

 becoming rose-colored above, or purple with white riblets, roseate above, 

 and sometimes light brownish-yellow near the apex. Whorls about 

 10J, but slightly convex, the last four (three to five) of about equal 

 diameter, those above forming a moderately long, obtuse cone. 

 Sculpture of rather close and fine riblets, normally 25 to 40 on the 

 penultimate whorl, but varying within wider limits. Aperture 

 truncate-ovate, dark purple within, the peristome usually paler, brown 

 or whitish, very narrowly reflexed, slightly thickened, continued in 

 a strong, usually straight callus across the parietal wall. Parietal 

 lamella continuous with or contiguous to a spiral lamella, which ex- 

 tends inward about one whorl ; an infra-parietal lamella revolves 

 parallel with it, penetrates a little deeper, but is not visible in a front 

 view in the aperture. Axial lamella inconspicuous from in front, 

 often immersed. 



Length 25, diam. 9^ mill. 



Length 22, diam. 8 mill. 



Inagua : N.- W. point and east end, on the opposite side of Lake Rosa 

 (Van Nostrand); scrub lands just back of Matthew stown to the 'salina' 

 in the interior, clinging to the trunks of small trees (Maynard). 



Turbo uva BROOKS, An Introduction to the Study of Conchology, 

 pp. 126, 163, pi. 8, f. 101 (London, 1815); and Leipzig edition, An- 

 leitung zu dem Studium der Conchylienlehre, p. 110 (1823). Pupa 

 rubicujida MKE., Verzeichniss der Ansehnlichen Conchylien-Samm- 

 lung des Freiherrn von der Malsburg, p. 8, no. 151 (Pyrmont, 1829); 

 Syn. Meth. Moll. Museo Menkeano, edit. 2, p. 34 (1830) KUSTER, 

 Conchyl. Cab., Pupa, p. 76, pi. 9, f. 8/9 ; pi. 10, f. 3, 4, with var. 

 variegata Kiist. Pupa alvearia Dillw., PFR., Monogr. ii, p. 315; iii, 

 537; iv, 659; vi, 291 DESHAYES, in Fer., Hist., p. 211, pi. 150, 



