HELIX §. 20. 21. 107 



apertura parvula , subverticalis , lunato-subcircularis ; perist. sim- 

 plex, acutum. — Diam. maj. 2/2, min. 2^4, alt. 1^4 mill. (Mus. 

 Cuming. ) 



Helix arctispira Pfr. in Proc. Zool. Soc. i846. p. 41. 

 Habitat in insula Juan Fernandez , una cum H. tessellata. 



Obs. Characleribus intermedia inter H. costellalam et tessellalam, ab 

 utraque spira convexiuscula etc. valde diversa. 



269. H. tenuicostata Shuttleworth. 



T. umbilicata, depressa, tenuis, tenuiter costulata, cornea; 

 spira convexiuscula , obtusa; anfr. 4 convexiusculi, ultimus antice 

 non descendens, basi sublaevigatus; umbilicus latiusculus, per- 

 spectivus ; apertura subobliqua, lunato-circularis ; perist. simplex, 

 acutum, margine columellari vix dilatato. — Diam. maj. ^y^, 

 min. 2^4, alt. 1 y^ mill. (Mus. Cuming.) 

 Helix tenuicostata Shultl. in sched. Cuming. 

 — — Pfr. Symb. m. p. 68. 



Habitat in Sardinia. 



Obs. Nescio, an haec species ab auctore rite descripta sit? In hoc casu 

 H. lenuicostata Dkr. (Nr. 880.) alio nomine designanda erit, in contrario spe- 

 cies Shuttleworthiana. 



§. 21. 



270. H. euryomphala Pfr. /; .^V ; ^;, 



T. umbilicata, orbiculato-convexa, tenuis, peliucidai virenti- 

 cornea, superne regulariter costulato-striata , lineis concentricis 

 obsolete decussata, basi distantius striata, nitidissima; spira 

 parum elevata , obtusa ; anfr. 6 convexiusculi , ultimus dilatatus, 

 subdepressus, anticenondescendens; umbilicus magnus, pervius; 

 apertura oblique lunato-ovalis, intus margaritacea; perist. rectum, 

 simplex, marginibus conniventibus. — Diam. maj. 37, min. 32, 

 alt. 17 mill. (Mus. Cuming.) 



Helix euryomphala Pfr. in Proc. Zool. Soc. 18 45. p. 71. 

 Habitat in insula Cuba. 



271. H. Walkeri (Zonites) Gray. -i- M/^./jaAm^-^^-' 



T. depressa, umbilicata, polita, flavo-brunnea;'^afni[i'. 3'/2"ci- ' 

 tissime majores, ventricosi, tenuiter concentrice striati, dorso 

 striis densis spiralibus; umbilicus profundus; apertura magna; 

 faux albida. — Diam. 1 unc, axis 8 lin. (Gr.) 



Zonites Walkeri Gray in Proc. Zool. Soc. 1834. p. 63. 



— — Milll. synops. p. 13. 



Mesomphix Walkeri Beck ind. p. 7. 

 Habitat in Nova Hollandia. 



f^ ■ 



