38 HELIX §. 7. 



Helix Tais Homhr. et Jacquin. Voy. Pol Sud. Atl. Livr. 2ii. i. 

 7. f. 42 — 45. 



— — Chemn. ed. IL Helix N. 782. t. 125. f. 32. 33. 



— Thais Pfr. in Zeitschr. f. Malak. 1849. p. 68. 



— tropidophora Adams et Reeve Voy. Saraarang. Moll. p. 59. 



t. U. f. 14. 



Habitat in insulis Marquesas: Borneo (Adanis). 



7L H. ornatella (Microcystis) Beck. 



T. imperforata, orbiculato-convexa, tenuis, carinata, lae- 

 vigata, nitidissima, pelkicida , straminea, lutea vel fulva, uni- 

 color vcl fascia i rufa ornata, rarius basi purpurea; spira 

 obtuse conoidea; anfr. 4^^ convexiusculi, ultimus carinatus, 

 basi convexior; apertura parum obiiqua, subangulato-lunaris; 

 perist. simplex, acutum, rectum, margine columellari intrante, 

 subcalloso. — Oiam. maj. ilVs? "^i"- 'I^Va? cilL '^ '^ill- (ColL 

 Nr. 36.) 



Microcystis ornatella Beck ind. p. 2. N. 4. 



Nanina (Microcystis) ornatella Beck in M. R. C. VIIL t. 3. f. 3 



a — h. (ined. ) 

 ^l^^W _ _ _ Alb. Hehc. p. 59. 



x-p^Helix ornatella Pfr. Symb. II. p. 36. 



— — Pfr. Monogr. I. p. 32 ( ex parte). 



— — Chemn. ed. IL Helix N. 815. t. 129. f. 7—10. 



— realis Miihlf. in Anton Verz. p. 35. N. 1329. 

 P? Depressior, unicolor virenti-lutea: 



Microcystis amoenula Beck ind. p. 2. N. 6. 

 Nanina (Microcystis) aiyioenula Beck in M. R. C. VIII. t. 3. 



L 5 a — d. 



Habitat in insula Pitcairn (Cuming), var. ^? in insula Opara 

 (Beck). 



Obs. Distinguenda videtur ab H. Adamsi (Nr. 46.), cujus varietalem 

 facillime habere possis, anfractuum numoro, ultimo usque ad aperturam 

 carinato, lesla pellucida, basi convexiore, etc. 



72. H. membranacea Lowe. 



T. imperforata, depressa, tenuissima, fere membranacea, 

 carinata, ruguloso-plicata, pallide cornea;, albido marmorata et 

 ad carinani acutiuscuiam subfasciata; spira brevis, conoidea, 

 aculiuscula; sutura impressa; anfr. 4 convexiusculi, rapide 

 accrescentes, ullimus non descendens, basi convexus; aper- 

 tura aiiipla, diagonalis, lunato-rotundata; perisL simplex, rectum, 

 inarginibus subconniventibus, columellari substricte recedente. 

 — biam. maj. 9^3, min. 7^2, alt. 5 mill. (ColL Nr. 37.) 



