54 HELIX. 



Yar. SUBI^EVIS, Westerlund. 



Costse obsolete, without ciliae, lip rose-colored. 

 H. PERACANTHODA, Bourg. PL 22, figs. 20-22. 



Narrowly perforate, brownish, costate, the costse lamelliform 

 on the last whorl and spinously prolonged on the peripher}^ ; 

 whorls 4, convex, rapidly enlarging, periphery angulated. 



Alt. 1-5 mill. 



Abyssinia. 



First described by Bourguignat as H. Haffrayi, preoccupied 

 by Tapparone-Canefri. 



H. HARPA, Say. PI. 9, figs. 13, 14. 



Subperforate, very thin, slightly striate, distantly plicate, 

 pellucid, olivaceous corneous ; whorls 4, convex, the last 

 rounded. Alt. 3'5, diam. 2 mill. 



Northern United States, Labrador, Siberia, Sweden, etc. 



The synonyms are Pupa costulata, Mighels, H. Amurensis, 

 Gerstf. It is viviparous, and is the type of Morse's genus 

 Zoogenetes. 



H. SPINIFERA, Mousson. PI. 9, figs. 15-17. 



Very minutely perforated, rather thin, corneous yellow, pel- 

 lucid, with remote lamellate striae, and long membranaceous 

 ciliae; whorls 3J, convex, the last not descending, rounded or 

 rounded-angular on the periphery, base subtumid around the 

 perforation; lip very slightly expanded, the extremities con- 

 verging, united by a thin callus. Diam. T75 mill. 



Ins. Palma, Canaries. 

 H. LAMELLATA, Jeffreys. PL 9, figs. 18, 19. 



Perforate, beautifully membranously costulate, waxy, cor- 

 neous; whorls .5, subequal ; aperture depressed, lunar. 



Diam. 2-3 mill. 



England, Ireland, Sweden. 



It is H. Scarburgensis, Ttirton, and H. seminulum, Rossm. 



H. MONAS, Morelet. PL 9, figs. 20, 21. 



Perviously umbilicated, striolate, waxy, fulvous; whorls 4, 

 subequal, convex, laterally compressed, suture profound. 



Diam. 2 mill. 



7ns. San Miguel, Azores. 



