HELIX §. 10. 57 



169. Jenynsi Pfr. iChemu. ed. II. Helix N. 8!2l.t. i^9. 



f. 23. 24. — Namna [Xesta] Jenynsi Alb. p. ^9.) Mon. I. p. 81. 



170. H. Folini Morelet. 



T. perforata, turbinata , cai-inata , tenuis, superne costis 

 subdistanlibus chordaeformibus munita, subdiaphana, parum 

 iiitens, rufa; spira conica, acuta; anfr. 7 convexiusculi, ultimus 

 non descendens, medio acute carinatus, basi convexus, laevi- 

 gatus, nitidus; apertura parum obliqua, subangulato-lunaris; 

 perist. simplex, rectum, margine columellari subcailoso , refle- 

 xiusculo. — Diam. maj. 9^3 , min. 8% , alt. 7 mili. (Mus. Cuming. j 

 Helix Folini Morelet in Revue zool. 18 48. p. 352. 



— talcosa Gould in Proc. Bost. Soc. III. 1850. p. 194?*) 

 Habitat in insula Principis sinus Guineensis (Leop. de Folin). 



171. H. scalprum Valenciennes. •[• 



T. orbiculato-discoidea, tenuis, pelkicida, palhde corneo- 

 fuscescens, lenue striata ; spira depressa, apice acuminata ; anfr. 

 5 angusti, subplani, conjuncti, ultimus depressus, ad periphe- 

 riam acute carinatus, basi convexiusculus, perforatus; apertura 

 depressa, subtrigona, obhqua; perist. simplex, acutum; colu- 

 mella subunidentata. — Diam. 16, alt. 9 mill. (Dh. ) 

 Helix scalpnm Valenc. in Mus. Paris. 



— — Desh. in Fer. hist. L p. 362. N. 429. t. 6 4A. 



(nec t. 62 A.) f. 2 — 4. 

 Habitat . . .? 



172. H. securiformis Deshayes. •{• 



T. orbiculato-subglobosa, tenuis, lucida , viridescens, lae- 

 vigata, ad peripheriam acute angulata; spira lata, conoidea, 

 apice acuminata; anfr. 47^ convexiusculi , rapide crescentes, 

 ultimus magnus. tumidus, in medio acute carinatus, subtus 

 convexus, subperforatus ; apertura rotundato-trigona , magna ; 

 perist. simplex, tenue, non reflexum. — Diam. 10, alt. 6 

 mill. (Dh.) 



Helix securiformis Desh. in Fer. hist. i. p. 362. N. 42 8. t. 

 64 A. f. 5. 6. 

 Habitat . . .? 



*) T. parva, tenui, vix perforata, pyramidali, talcosa, spiraliter 

 acutissime lirata, basi glabra; spira conica, anfr. 7 planis, ultimo acu- 

 tissime carinato ; apertura rhomboideo-lunata. — Diam %, axis Ys poll. 

 — Hab. Cape Palmas (Dr. Perkins). — Remarkable for its trochoid form 

 and silvery lustre, on account of which it would most likely be pro- 

 nounced a marine species. H. Ibuensis accords well with this, excepting 

 that the sharp revolving lines, about 3 or 4 on each whorl, are not 

 mentioned. (Gould I. c. ) 



