20 HELIX PLAGIOPTYCHA. 



duclosiana, and more nearly parallel to the lower lip. In all other 

 characters it is like H. duclosiana. 



Eleuthera and San Salvador, (or Cat Island) Bahamas. 



Var. ABACOENSIS Martens. PL 12, figs. 50-52. 



Narrowly umbilicated, depressed conoid, rather thin, obliquely 

 rugose-striate, yellowish white, with a pure white peripheral fascia, 

 bordered on both sides with rufous ; spire short-conoidal, apex obtuse ; 

 whorls 4*, slightly convex, the last subdepressed, deflexed anteriorly, 

 the base moderately convex ; aperture diagonal, truncate-oval ; peri- 

 stome within subroseous, distinctly albo-labiate, its margins converg- 

 ing, the upper margin simple, lower narrowly expanded, provided 

 with an oblong dentiform callus within ; columellar margin much 

 dilated at the insertion, half covering the umbilicus. 



Alt. 9, diam. maj. 14, min. 12 mill. (Pf&iffer.') 



Abaco Id., Bahamas. 



It is separated from the normal H. duclosiana Fer. by the strong- 

 er sculpture, less depressed form, and the white, red-margined per- 

 ipheral band. (Pfr.) 



H. duclosiana var. abacoensis Martens, PFR. in Novitates Conch, v. 

 p. 187, t. 154, f. 9-11. 



I simply follow PfeifFer in placing this form here. It seems to me 

 to be more nearly allied to several of the species preceding H. du- 

 closiana than to that form. I have seen no specimens of Plagiopty- 

 cha from Abaco (one of the northennost islands of the group,) so I 

 have not identified the variety. 



H. MACKOGLOSSA Pfeiffer PL 31, figs. 9-13. 



Perforate, depressed or subturbinate-depressed, thin, somewhat 

 shining, corneous, with a distinct supra-peripheral dark brown fascia ; 

 minutely striated ; spire low-conical, or quite depressed ; sutures 

 slightly impressed ; whorls 4J, slightly convex,, the last deeply 

 descending anteriorly ; aperture very oblique, truncate-oval ; peri- 

 stome simple, the baso-columellar margin expanded, partly closing 

 the umbilicus, ends converging or not. Within the base there is a 

 rather deep-seated, strong, oblique tubercle, its position indicated 

 outside by a slight flattening and wrinkling of the surface. 



Alt, 6-7, diam. 11-13 mill. 



Great Inagua Id., Bahamas. 



H. macroglossa PFR., Malak. Bl. 1866, p. 115 ; and Monographia, 

 v. p. 234. 



