258 



HELICELLA. 



H. monilifera W. & B., iv, 20. 

 H. lancerottensis W. & B., iii, 

 v. webbii Lwe. [237. 



v. bertheloti Lwe. 

 v. adoptata Mouss. 

 H. persimilis Shutt., iv, 19. 

 v. prseposita Mss. 

 v. devia Mouss., iv, 20. 

 H. phalerata W. & B., iv, 19. 

 rosetti W. & B. 

 nivariensis Sh., Rve. 

 H. umbicula Sh., iv, 21. 



roseti Pfr. not W. & B. 

 phalerata Pfr. not W. & B. 



H. csementitia Sh., iv, 20. 



H. tumulorum W. &B., iv, 19. 



? atomata Mke., iv, 21. 

 H. oleacea Sh., iv, 20. 



v. deusta Lwe. 

 H. woodwardia Tarn., iv, 20. 

 H. watsoniana Woll., iv, 21. 

 H. lemniscata W. & B., iv, 21. 

 H. orbignyi W. & B., iii, 237. 

 orotavana Tarnier. 



v. mitigata Mouss. 



v. calcarea Mouss. 

 H. phryganophila Mab. 

 H. dendrophila Mab., iii, 237. 

 H. aglaometa Mab., iii, 237. 



Section Jacosta Gray, 1821. 



Jacosta GRAY, London Med. Repos., xv, March 1, 1821, p. 236, 

 only species mentioned H. Jacosta albella Dr&p.= explanata Mull. 

 Numidia ISSEL, Ann. Mus. Civ. Genov. xxii, 1885, p. 8, 9, type H. 

 idia Bgt. Xerofalsa MONTS., Moll. Terrest. delle Isole adiacenti 

 alia Sicilia, 1892, p. 21 (for H. idia, eniea, zougitana). Xerosecta 

 MONTS., I. c. (for H. explanata). Xeroplana MONTS., L c. (for H. 

 doumeti, depressula). Xerotropis MONTS., t. c., p. 23 (for gar goitre, 

 jolyi, prietoi, ledereri, milaschewischi, spratti). Xeroamanda MONTS., 

 t. c., p. 22 (for amanda, usticensis). Xeromoesta MONTS., /. c. (for 

 moesta, Jcabyliana, dormiens, dohrni). Xerocodia MONTS., t. c. p. 23 

 (for montserratica, penchinati, barneana). Xeroplexa MONTS. L c. 

 (for setabulensis, nyelli, coronadoi). Tropidocochlis LOCARD, Ex- 

 change ix, p. 97, 1893, type H. explanata. 



Shell umbilicated, the whorls flattened above, acutely keeled at 

 periphery, and convex beneath; surface costulate, striate or smooth- 

 ish ; solid and earthy, whitish with or without bands, the apex black 

 or light. Aperture angled, the lip rather blunt, not expanded. Type 

 H. explanata Mull., pi. 68, figs. 23, 24. 



Jaw arcuate and ribbed. Genital system (pi. 69, fig. 15, If. ex- 

 planata') with the flagellum rather longer than usual in the genus ; 

 dart sack slightly bilobed at apex and containing two darts ; mucus 

 glands numerous. 



