HELIX-PLANISPIRA. 279 



above, close to the suture. No spots. Peristorne white, broad. 

 Usually an impression behind the lip above. Size below the 

 medium or small. North Coast of Ceram. 



Form collis Mouss. (pi. 44, figs. 14, 14, 15.) White, with two brown 

 or rufous bands (subperipheral and supra-peripheral) ; last whorl 

 higher, more robust than in zonaria, very deeply descending in front, 

 the aperture nearly horizontal, rather narrow. Alt. 12, diam. 25 

 mill. Amboyna. 



H. FASCIOLATA Lesson. PI. 44, fig. 11 ; pi. 65, figs. 89, 90. 



Shell umbilicated, depressed, spire nearly plane, the inner two 

 whorls sunken, the next outer whorl a little projecting over the 

 succeeding one ; white, with two dark purplish-brown bands, the 

 upper one ascending the spire midway between the sutures, the 

 lower band wider, at and above the periphery. Base strongly 

 swollen, and then deeply constricted behind the basal lip. 



The aperture is very oblique ; lip rather narrowly reflexed, and 

 of the same width all around; pure white, perceptibly thickened 

 within ; basal lip very obsoletely thickened, not really toothed. 

 Whorls 4J, the outer one convex, rounded, its upper surface behind 

 the aperture sloping, but without any oblique impression. Face 

 and back of the lip white. 



Alt. Hi, greater diam. 21, lesser 17 mill. 



Amboyna (Lesson) ; Ceram, Moluccas (Martens.) 



H. fasciolata LESSON, Voy. de la Coquille, Zool., ii, p. 311. VON 

 MARTENS, Ostas. Zool., Landschn., p. 314. 



Wh'ile belonging to the immediate group of H. zonaria, this shell 

 differs in the more regularly convex last whorl, less expanded aper- 

 ture, lack of an impression or dent back of the aperture on the 

 upper surface, lack of color spots, etc. In zonaria the outer lip is 

 much expanded; in this form it is not broader than the other 

 margins. The species is here for the first time figured. 



H. CHARIESSA Pilsbry. PI. 44, figs. 12, 13 ; pi. 68, figs. 96, 97, 98 

 Shell umbilicated, subdiscoidal, 1 inner whorls of the spire a 

 very little sunken ; chalky white with a narrow brown band exactly 

 on the periphery ; base a trifle swollen, gradually constricted behind 

 the basal lip ; a broad pit with several distinct little grooves behind 

 the middle of the upper lip ; peristome very broadly expanded. 



The shell is opaque white ; the band is brown or has that grayish 

 or colorless translucent appearance which the bands often assume in 



