HELIX CYSTICOPSIS. 9 



regularly curved ; eolumellar lip slightly oblique, nearly straight, 

 white, dilated. Alt. 12, cliam. 15 mill. ; alt. 12, diam. 18 mill. 



Jamaica. 



H. tenerrima AD. Proc. Bost. Soc. N. H., 1845, p. 16. PFR. in 

 Conchy I. Cab., t. 29, f. 5-8. REEVE, Conch. Icon., f. 269. 



This species is allied to H. tumida, but is smaller, more fragile 

 and more depressed. The acute apex will separate it from H. 

 buddiana 



My description is drawn from specimens received from Prof. 

 ADAMS. 



VAR. MUNDA C. B. Adams. PI. 12, fig. 35. 



Shell depressed-globular, with a rather thick epidermis which is 

 horn colored on the upper whorls, and greenish-brown on the rest ; 

 with excessively fine striae of growth ; spire convex, moderately ele- 

 vated ; apex very obtuse ; whorls 5, moderately convex, with a 

 well-impressed suture ; last whorl large, somewhat depressed ; aper- 

 ture suborbicular, angular at the end of the oblique white colnmella, 

 and modified considerably by the penultimate whorl ; lip excessive- 

 ly thin and sharp ; umbilicus wanting. Alt. 10, diam. 15 mill. 



(Adams}. 



Jamaica. 



H. munda AD., Cont. to Conch, p. 32, (1849). PFR. in Conchijl. 

 Cab. t. 108, f. 21, 22, REEVE, Conch. Icon. f. 297. 



I have copied Adams' description of this form, because it may 

 prove to be distinct from the preceding. ISTumerous specimens be- 

 fore me, however, are scarcely more obtuse at the apex than H. 

 tenerrima and are better described by PfeiflTer s words, " Spira 

 obtusiuscula " than by Adams' phrase, " Apex very obtuse." 



H. COLUMELLATA C. B. Adams. PI. 12, fig. 31 ; pi. 31, fig. 5. 



Imperforate, globose-conical, very thin, showing under a lens 

 minute scars or punctations all over ; spire conoidal, apex acute 

 minute, sutures well-impressed from the beginning, whorls about 

 6, convex, slowly widening, the last more rapidly widening, gener- 

 ally somewhat compressed above the periphery, causing the whorl 

 to be sloping, and a little shouldered beneath the suture ; aper- 

 ture obliquely lunate, small ; outer lip very thin, acute ; eolumellar 

 lip oblique, thickened within by a very heavy white callus, which 



is abruptly truncated below. Alt. 16. diam. 18 mill. 



Jamaica, 



