224 AULACOSPIRA AND SYSTENOSTOMA. 



lique, somewhat mucronate. Whorls 4, nearly flat, obtusely 

 angular, the last slightly sulcate above behind the angle, 

 shortly descending in front, and very shortly free. Aperture 

 very oblique, rounded-rhombic; peristome continuous, thin, 

 slightly expanded throughout. Parietal lamella strong, much 

 elevated, three teeth arranged in form of a cross on columellar, 

 basal and outer margins. Alt. 1.5, diam. 3.25 mm. (Mlldff.). 



Philippines: Tablas, taken by a native collector. 



Aulacospira, rhombostoma MLLDFF., Nachrbl. D. Malak. 

 Ges., xxviii, Feb. 1896, p. 8. 



Very near A. scalatella, but larger, with the last whorl de- 

 scending less to the aperture. There is no basal fold, but the 

 lower palatal is almost basal in position, as in other species 

 having that plica. There are microscopic spiral lines, as in 

 the related species. A specimen measures, alt. 1.8, diam. 3.3 

 mm. ; another is 3.1 mm. in diameter. 



Subgenus Pseudostreptaxis Mlldff. 



Pseudostreptaxis MLLDFF., Bericht Senck. naturf. Ges., 

 1890, p. 225. 



7. AULACOSPIRA AZPEITIAE (Hidalgo). PL 38, figs. 14, 17. 



See Man. Conch., vol. 8, p. 199. The obtuse angle of the 

 penult whorl projects above the rounded last whorl. Besides 

 the four teeth of the typical Aulacospiras, this species has a 

 small basal fold, as in A. scalatella, and usually an angular 

 lamella can be recognized, though in some examples it is 

 pretty thoroughly united with the parietal lamella. Alt. 2.4, 

 diam. 3.2 mm. 



Philippines: Busuanga. 



Genus SYSTENOSTOMA Bavay & Dautzenberg. 



Systenostoma B. & D., Journ. de Conchyl., Ivi, 1909, p. 

 243 ; Ivii, p. 196 ; Ix, p. 23. 



The shell is helicoid, minute, thin, umbilicate, with conoid 

 spire and mucronate apex ; composed of 4% to 5 convex, not 

 carinate whorls, the last one turning slightly towards the 

 axis. The aperture is turned more or less downward, sub- 



