HELIX §. 20. 2i. 
107 
apertura par\uila, subverticalis , lunato-subcircularis ; perist. sim- 
plex, acutum. — Diam. maj. 2 / 2 , min. 2y4, ait. \^/a mill. (Mus. 
Cuming.) 
Helix arctispira Pfr. in Proc. Zool. Soc. 1846. p. 41. 
Habitat iu insula Juan Fernandez, una cura H. tessellata. 
Obs. Characteribus intermedia inter H. costellalam et tessellatam, ab 
utraque spira convexiuscula etc. valde diversa. 
^ 269 . H. tenulcostata 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. 2ys, 
min. 2 J/ 4 , ait. 1 '/3 mill. (Mus. Cuming.) 
Helix tenvicosMa ShultL in sclied. Cumihg! * • . * ' 
pfr, Symb. III. 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 Shuttleworlhiana. 
§. 21. 
270 . H. euryomphala Pft*. 
T. umbilicata, orbiculato-convexa, tenuis, pellucida, virenti- 
cornea, superne regulariter costulato-striata , lineis concentricis 
obsolete decussata, basi distantius striata, nitidissima; spira 
parum elevata, obtusa; anfr. 6 convexiusculi, ultimus dilatatus, 
subdepressus, antice non descendens; umbilicus magnus, per\dus; 
apertura oblique lunato-ovalis, intus margaritacea; perist. rectum, 
simplex, marginibus connivenlibus. — Diam. maj. 37, min. 32, 
ait. 17 mill. (Mus. Cuming.) 
Helix euryomphala Pfi\ in Proc. Zool. Soc. 1 845. p. 71. 
Habitat in insula Cuba. 
271 . H. Wallceri (Zonites) Cray, 'f 
T. depressa, umbilicata, polita, flavo-brunnea; anfr. 3/2 ci- 
tissime majores, venlricosi, tenuiter concentrico 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. 
— — 3Iull, synops. p. 1 3. 
Mesomphix Wallceri Beck ind. p. 7. 
Habitat in Nova Iloilandia. 
