DIGONIAXIS, AZECA. 289 



penult, and last whorls biangular, one angle above, the other 

 below, flatly roof-shaped around the suture. Last whorl slightly 

 over one-third the total length, biangular, the upper angle 

 bounding the roof-like subsutural belt, the other below at the 

 periphery, flat between the angles from the beginning. Aperture 

 suboblique, irregularly subovate, the outer margin arching for- 

 ward. Columella bilamellate, the lamellae acute, thin, the 

 upper one stronger and coiled around the axis. Peristome 

 fragile, unexpanded and acute. Length 9, diam. 2.5, alt. 

 aperture 3 mm. (Jouss.). 



Mahala, between Aden and Steamer Point, on the beach. 



Digoniaxis bourguignati Jouss., Bull, de la Soci6te* Malac. de 

 France, vi, p. 348 (1889); vii, 1890, p. 101, pi. 3, f. 1-3. 



2. D. CINGALENSIS (Benson). Vol. xviii, pi. 4, fig. 18. 



Shell subrimate, subulate-turrited, slender, solid, polished, 

 striatulate, decussated with minute, very close undulating spiral 

 striae. Spire elongate, noticeably tapering above, apex un- 

 known. Suture slightly impressed, irregular. Whorls remain- 

 ing 11 (the apical ones wanting), flattened, the last whorl 

 rounded basally. Aperture suboblique, emarginate-elliptical; 

 peristome unexpanded, calloused within at the upper angle; 

 outer margin arcuate above, basal margin thickened, columellar 

 margin calloused, a little expanded, subreflexed, provided above 

 with an oblique solid spiral fold. Length 14, diam. 3, aperture 

 3x1.5 mm. (Bens.). 



Ceylon: Weelgamoowe, Matelle (Layard). 



Spiraxis cingalensis BENS., Ann. and Mag. N. H. (3 ser.), xi, 

 p. 91, 1863. PFR., Monogr., vi, p. 191. HANL. & THEOB., 

 Conch. Indica, pi. 79, f. 1. 



A Syrnola-like shell, differing from Tortaxis by the spiral plait 

 on the upper part of the columella. Its solidity causes me to 

 place it in Digoniaxis with some doubt, especially since it be- 

 longs to a different fauna. Known to me by description and 

 figure only. 



Genus AZECA 'Leach Turton.' 



Includes Azeca, Hypnophila, Gomphroa, etc. 



Oblong or ovate-fusiform Ferussacidae, with the aperture short, 



