HELIX-PLANISPIRA. 281 



var. edentata MARTENS, 1. c., t. 16, f. 5. H. instricta MARTENS, 

 Monatsberichte der Berl. Akad. 1864, p. 268. 



Var. INSTRICTA Martens. PI. 45, figs. 38, 39, 40. 



Smaller than H. quadrifasciata, more elevated, with thicker, 

 toothless peristome, but showing a slight swelling in the place of the 

 basal tooth ; whorl more deflexed in front. 



Islands Mar eh and Kajoa, near Ternate, Moluccas. 



This is the H. quadrifasciata var. edentata of Martens. 



H. AURITA Martens. PI. 45, figs. 44, 45, 46. 



Shell narrowly umbilicated, depressed, striatulate, whitish, three- 

 banded with reddish ; spire plane ; suture superficial ; whorls 4, 

 the upper ones complauate, the last one more convex above than be- 

 neath, the periphery rounded ; in front it widens, and is deeply de- 

 flexed ; is not constricted above, but distinctly so below ; aperture 

 subhorizoutal, ax-shaped, outwardly bent upward ; peristome thin, 

 white, nearly straight above, broadly expanded outwardly, narrowly 

 reflexed below ; margins moderately approaching, the upper recti- 

 linear, basal quite arcuate. 



Alt. 12, greater diam. 27, lesser 19i mill. (Mart.") 



Island of Moti, Moluccas. 



H. aurita MART. Monatsber. d. Berl. Akad. 1864, p. 369 ; Preuss. 

 Exped. nach Ostas., Landschn., p. 316, t. 16, f. 12. PFR. Mon. v, p. 



389. 



A single specimen found. Most nearly allied to H. zonaria, but 

 distinguished by the more stretched out mouth, the produced, ear- 

 lobe-like outer lip, and the rectilinear, simple upper lip. 



H. BICONVEXA Martens. PI. 46, figs. 57, 58, 59. 



Shell narrowly umbilicated, lenticular, acutely carinated, lightly 

 striatulate, sculptured with very close, very fine spiral lines ; shin- 

 ing, white (three) banded with brown ; spire plane ; whorls 4, a 

 little convex above, the last one a little and equally convex above 

 and below, with acutely carinated periphery, descending in front, 

 distinctly constricted below, not so above. Aperture subhorizontal, 

 ax-shaped, outer part bent upward ; peristome scarcely thickened, 

 white, nearly straight above, narrowly reflexed below, margins 

 rather approaching, the upper rectilinear, basal arcuate. 



Alt. 9^, greater diam. 26 1, lesser 19 mill. (J/ar/.) 



Island of Tawalli, near Batjan, Moluccas. 



