326 HELIX. 



subsp. parnassia Roth., i v, 1 43. bland Bgt., mss. 



subsp. oetse Kob., iv, 143. v. pantocratis Broem. 



/. alba Kob. v. coracis Kob. 



v. setolica Bttg., iv, 143. subsp. intusplicata Pfr. viii, 



subsp. crassa Pfr. iv, 144. v. subangulata Kob. [240. 



Unfyured and imperfectly known species or forms of Otala. 



H. miloni, parisotiana, hermieri, chydopsis, of (Bgt.) Pechaud. H. 

 ramisi, catharolena, toukriana, galiffetiana, eugastoria, bandotiana, 

 agenna. lucentumensis, acanonica, nitefacta, sticta, azorella, lampri- 

 mathia, takredica, romalea, brocha, seignetti, Bgt. H. cantse 

 chorista, tiranoi (Bgt.) Serv. H. secouria, mattarica Let & Bgt. 

 H. seguyana, acatergastra, speiratopa, bouthyana, alabastra Pechaud. 

 H. duriezi Deb. H. flattersiana Anc. 



Section Hemicycla Swainson, 1840. 



Hemicycla SWAINSON, Malacology, p. 331, type H. plicaria Lam. 

 Mycena Alb., Die Hel., 1850, p. 123. Cochlea (part) ADANSON 

 etal. 



Shell imperforate or umbilicate, globose-depressed, solid and 

 opaque ; 5-banded, but the number frequently reduced by the ab- 

 sence of band v or the coalesence of bands ii and iii, sometimes all 

 bands obsolete. Surface strongly striate, decussated or malleated. 

 Whorls 4 to 6, the last deflexed in front. Aperture very oblique ; 

 lip reflected throughout, thickened within, the baso-columeller mar- 

 gin wider, usually flattened and appressed, often obliquely toothed. 

 Young shells angular or keeled. Type H plicaria Lam., pi. 43, fig. 

 43 (see also pi. 43, fig. 44, H. saulcyi Orb.). Anatomy unknown. 



Distribution, Canary Islands. Although the anatomy of this 

 group is still unknown, the close correspondence of its shell to Otala 

 renders its systematic position moderately certain. The soft parts 

 will probably prove the same as in other pentatseniate snails, unless 

 an earlier stage of development be retained in fewer-branched mucus 

 glands. The Canary Island fauna is much less individualized than 

 that of the Madeira, Azores and Cape Verde groups, and in its Helices 

 it seems much more nearly allied to that of the Mediterranean tract. 

 The number of species will probably be somewhat reduced by more 

 critical study of their variations. 



