274 



CEIUON, GROUP XIII. 



'Specimens measure: 23^x9 mill.; 20x8| 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 G. rubicnndam 

 by degeneration of the lamella?, 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. 



!. 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 

 10|, 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 

 jpenultimate whorl, but varying within wider limits. Aperture 

 itruncate-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 

 ilarnella 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 Maitheivstown to the 'salina' 

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



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



ipp. 120, 1 G3, pi. 8, f. 101 (London, 1815); and Leipzig edition, An- 



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



crubiounda MKE., Verzeichniss der Ansehnlichen Conchylien-Samm- 



,lung d< j s Freiherrn von der Mnlsburg, p. 8, no. 151 (Pyrmont, 1829); 



Syn. Metli. Moll. Museo Menkeano, edit. 2, p. 34 (1830) KUSTKK, 



Conchyl. Cab,, Pupa, p. 7(5, pi. 9, f. 8, 9 ; pi. 10, f. 3, 4, with var. 

 varieyatu Kiist. Pupa alvcaria Dillw., PFR., Monogr. ii, p. 315; iii > 

 537; iv, 059; vi, 291 DKSIIAYKS, in Fer., Hist., p. 211, pi. 15C-, 



