52 PROCEEDINGS OF THE ACADEMY OF [Vol. LXXIV 



Subgenus HELICIXA s. s. West Indies. 



Hdicina Lamarack (1799, 1801). Type H. neritella Lam. (1799). Jamaica. 

 Pitonm llus, Pitonnillus Montfort (1810). Type H. neritella Lam. (Pitonil- 



lus auct.). 

 ? Pachytoma Swainson (1840). Type H. occidentalis Guilding (1828). 



Saint Vincent 1. 

 Pachystoma auct., not Pachystoma Guilding (1828). 



Euneritella A. J. W. (1905). Type (by tautonomy) H. neritella Lam. 

 ?? Subglobulosa A. J. W. (1905). Type (by tautonomy) H. subglobulosa 



Poey (1852) Cuba. 

 ?? Festiva A. J. W. (1910). Type (by tautonomy) H. f estiva Sowerby 



(1839) Haiti. Not Festivus Crotch (1872) nor Festiva Gray (group 



larger than genus). 



I have been able to obtain but one specimen of H. neritella 

 diplocheila A. J. W. 30 The animal was almost completely destroyed 

 by dermestids, but by washing it out carefully, I obtained 

 examples of all of the kinds of teeth, and a few clumps with the 

 centrals, comb-laterals, accessory plate, and a few of the inner 

 marginals still clinging together. The centrals are not arranged 

 in their natural position in the figure (Plate III, fig. 6), and the 

 R-central, especially is not foreshortened as usually seen. 



The markings of the R-central are peculiar. The A-central 

 has a peculiar shelf-like projection, which bears three, deep-set, 

 large, rounded cusps. The B and C centrals are very similar to 

 those of Tenuis, but are shown from a somewhat different angle. 

 The comb-lateral has a rather narrow basal plate (Plate IV, fig. 

 17). The accessory plate has a small body but a large lanceolate 

 appendix, and the reflected anterior portion forms a quite promi- 

 nent shelf, which juts out almost at right angles to the body of 

 the plate. The innermost marginals are very short and broad, 

 not over one-half as long as the longest ones. All of the definitive 

 marginals have sickle-shaped tips, with wings which remotely 

 resemble those of the section Succincta of Oligyra, but are much 

 better-developed. 



In addition, I have examined H. adspersa Pfr. (1839), both the 

 large, typical form and a smaller variety H. a. marmorata d'Orb. 

 (1845) = //. tenuilabris Pfr. (1848) 31 . This Cuban species has 

 sharper cusps on the A-central (Plate VII, fig. 37) and also on the 

 comb-lateral (Plate IV, fig. 17 A). The wings on the marginals 

 are more prominent than in H. neritella, and, in certain views, 



10 1 dried specimen; A. N. S. P. no. 104391; collected at Orange Hill, Montego 

 Bay, Jamaica, by A. P. Brown. This is H. n. angulata C. B. Adams (1851), 

 not H. angulata Sowerby (1842). 



31 3 alcoholic specimens, sent me by John B. Henderson; from Western Cuba. 



