HELIX-CARACOLUS. 123 



After studying a suite of several hundred specimens of banded 

 Caracolm from numerous localities, I am disposed to unite all of the 

 forms under the oldest name, maraginella. I am convinced that 

 there are no characters in the shells, either of contour, sculpture or 

 color, which do not absolutely and by imperceptible degrees shade 

 from one form into another. Intermediate and transition forms are 

 numerous. The following descriptions are taken from typical exam- 

 ples of the several varietal forms. All Cuban Caracohis have already 

 been united by Arango under the name of JET. sagemon Beck. I 

 have found it necessary to entirely revise the nomenclature and 

 synonymy of the varieties, and have given to the bibliography of 

 the group an amount of time and labor all out of proportion to the 

 apparent results. 



The synonymy of each of the varieties recognized is given in a 

 separate paragraph. 



( Typical marginella.) 



H. marginella GMEL. Syst. Nat. xiii, p. 3622 (1789). H. margin- 

 aid BORN, Mus. Cses. Vind. Test., 1. 14. f. 7, 8. (not marginata Miiller). 

 -FEB. Hist. t. 63, f. 3, 4, 5, 6. ORB. Moll. Cuba, t. 9, f. 11-13. 

 (Carocolla marginata Lam., Discodoma marginata Swains.) H. 

 marginata Bornii CHEMNITZ, Syst. Conchyl. Cab. ix, p. 80, t. 125, f. 

 1097. ?#. fasciata Blainv. Man. de Malacol. p. 460, t. 39, f. 3. 

 (1825). Caracolla indisereta BECK, Index, p. 31 (no desc.). H. 

 sagemon BECK, Index, p. 31 (founded on the same figure Gmelin 

 cites for his H. maraginella !) PFR. in Conchyl. Cab. p. 96, t. 13, f. 

 3, 4. H. arangiana POEY, Memoriae, i, p. 410. PFR. Monogr. iv, 

 p. 237 ; Novit, Conch, iii, p. 395, t. 92, f. 7, 8. H. marginatoides 

 ORB., Moll. Cuba, t. 5, f. 8-10. H. arangiana var. semiaperta 

 MARTENS in Novitates Conchologicse v, p. 33, t. 144, f. 15-18 

 (1877). 



( Var. gutierrezi Poey.) 



If. gutierrezi POEY, Memorias i, p. 411, t. 25, f. 5-8. PFR. 

 Monogr. iv, p. 239 ; Novit. Conch, iii, p. 395, t. 92, f. 3-6. 



( Var. schwartziana PfrS) 



H. schwartiziana PFR. Malak. Bl. xi, p. 125 (1864) ; Novit. Conch, 

 i, p. 269, t. 67, f. 1,2. 



( Var. mina Pfr.*) 



H. mina PFR. Zeitschr. f. Mai. 1852, p. 92 ; Conchyl. Cab. p. 

 261, t. 136, f. 16, 17 ; Monographia iii, p. 205. H. marginata D'ORB. 

 Moll. Cuba, t. 9, f. 11-13 (not marginata Mull.) 



