HELIX §. 5. 6. 35 



simplex, acutum , rectuni, margine columellari brevi, callo 

 dentiformi, retrorsum prolongato, incrassato. — Diam. maj. 7, 

 min. 6, alt. 3 mill. (Coll. Nr. 32.) 



Helix callifera Pfr. in Zeitschr. f. Malak. 1850. p. 68. 



— — Chemn. ed. II. Helix N. 802. t. 127. f. 13—16. 

 Habitat in insulis « Marquescis ». 



55. H. Tullia (Nanina) Gray. 



T. imperforata, depressa, lenuis, confertini costulata, dia- 

 phana, luteo et rufo tesseliata; spira vix convexiuscula; anfr. 

 5 convexiusculi, angusti, ultimus non descendens, peripheria 

 obsolele angulatus, basi medio impressus; apertura subverii- 

 calis, lunaris; perist. simplex, rectum, margine basali declivi, 

 leviter arcuato. — Diain. maj. ^y^j i^ii^- ^i ^^^- 2 mill. (Mus. Brit.) 



Nanina Tullia Gray in Proc. Zool. Soc. 1849. p. 165. 

 Habitat Auckland Novae Seelandiae (Greenwood). 



§■6. 



56. Powisiana Pfp. {Chemn. ed. II. Helix N. 904. 



t. 139. f. 21. 22.) Mon. I. p. 34. 



57. orbis Beck. (Coll. 33. — Chemn. ed. nov. I. p. 23 4. 



— Nanina [Microcystis] orbis Alb. p. 39.) . . . - - - 32. 



58. H. exaequata Gould. 



T. imperforata, discoidea, tenuis, laevigata, nitida, pellu- 

 cida, rufo-cornea: spira plana; sutura vix impressa, margi- 

 nata; anfr. 6 plani, lente accrescenles, ultimus superne obtuse 

 angulatus, basi planiusculus, medio impressus; apertura ver- 

 ticalis, anguste lunaris; perist. simplex, acutum, reclum, rnar- 

 gine basali strictiusculo. — Diam. maj. 7, min. 6, alt. 3 mill. 

 (Mus. Cuming.) 



Helix exaequata Gould in Proc. Bost. Soc. 1846. p. 171 et 

 Exped. shells p. 19. Ed. 1851. p. 47. f. 67. 

 _ _ pfr. Monogr. I. p. 193. N. 498 a. 



— - Chemn. ed. II. Helix N. 801. t. 127. f. 2 1 —23. 



— disculus Pfr. in Zeilschr. f. Malak. 1850. p. 68. Nec Desh. 



— obtusangula Pfr. in Zeitschr. f. Maiak. 1850. p. 153. 

 Habitat in insulis Sandwich. 



59. H. Proserpinula Pfr. 



T. imperforata, discoidea, tenuiuscula, striatula, parum 

 nitida, virenti-cornea; spira subdiscoidea; sutura levis, non 

 callosa; anfr. 47^, ultimus subdepressus, basi planiusculus, 

 medio impressus, intus subcallosus: callo perlucente; aper- 

 tura diagonalis, oblique lunaris; perist. simplex, rectum, mar- 



3* 



