100 OBELISCELLA. 



"The last whorl is modified in shape by an obtuse peri- 

 pheral angle, sometimes accompanied by a very faint yellow- 

 ish-green band, which continues to the second half of the last 

 whorl, in the line of sutural development. 



"This species is distinguished from A. octona by having a 

 shorter more conical spire generally composed of fewer 

 whorls, as well as by the angular form of the last whorl. 

 It is moreover, more distinctly striate." (Morelet.) 



43. S. CANONICA (Morelet). PL 13, fig. 33. 



"Shell subulately turrited, apex acute, very finely striate, 

 at the suture plicatulate, shining, horny brown. Spire regu- 

 lar. Whorls 9, planulate, the last hardly equal to one-fourth 

 the entire length of the shell. Columella strongly arcuate, 

 short and obliquely truncate. Aperture semioval, peristome 

 acute, unexpanded. Length 19, diam. 5y 2 mm." (Morelet.) 



Comoro Islands: Grand Comoro (Humblot.) 



Stenogyra canonica MORELET Journ. de Conch, xxxiii, p. 

 291, pi. 14, f. 8. October, 1885. 



This species, which enlarges very regularly, approaches 8. 

 simpularia of Anjouan I., but the columella is short, strongly 

 arcuate and obliquely truncate; and after the fourth whorl 

 one sees fine and not very regular strite, of which some more 

 prominent than the rest, make it plicate below the sutures. 

 (Morel.). 



Genus OBELISCELLA Jousseaume. 



Oleliscella Jouss., Bull. Soc. Malac. France vi, 1899, p. 

 359 (0. lucidissima the only species mentioned). 



Shell impcrforate, turrited, with obtuse, rounded smooth 

 apex and glossy surface, composed of 9 or 10 nearly flat 

 whorls. Aperture oblique, ovate, the outer lip obtuse, being 

 slightly thickened but not in the least reflexed, straight, not 

 retracted above or below. Columella continuous with basal 

 and parietal margins, slightly concave, rounded, reflexed and 

 closely appressed; parietal callus distinct. Type 0. lucidis- 

 sima (Palad.). 



Distribution, Southern Arabia and probably East Africa. 



