TROCHOMORPHA. 125 



hartmanm (Chemn. edit. II, Helix, t. 94, f. 16-18) in the more 

 rapidly increasing whorls. The figure 16 represents the basal lip 

 as too much arcuated, but in fig. 15 the columella should appear 

 more strongly arched upward. The specimens before me are 

 labelled " Mindoro," but I know not upon whose authority. 



T. COSTELLIFERA Mollendorff. PL 20, figs. 8, 9, 10. 



Shell umbilicated, umbilicus ] the diameter of the base, conoid, 

 depressed, thin, shining, corneous yellow, spire little raised, almost 

 regularly conical, the apex rather acute, whorls 5* slowly increasing, 

 convex, regularly ribbed striate, decussated throughout by very 

 delicate, distant impressed spiral lines, suture margined, crenulated, 

 last whorl with a thread-like carina, the base striated, roundly 

 angled around the umbilicus. Aperture oblique, irregularly 

 rhomboidal, peristome simple, acute, upper margin straightened, lower 

 margin rounded, sublabiate, columellar margin short, a little 

 straightened, slightly thickened. 



Alt. 4f, diam. 10 mill. ; aperture, alt. 3i, width 4 mill. (Mlldf.*) 



Northwestern Zebu, Philippines' 



Trochomorpha (Videna) costellifera MLLDFF., Landschnecken 

 Fauna, Cebu, p. 214, t. 8, f. 3, 1890. 



No Philippine species is closely related to this handsomely sculpt- 

 ured Trochomorpha. From T. splendens and T. splendidula with 

 which it shares the unicolored shell without a white keel-band, it is 

 separated by the regular, strong, ribbed-striation and the presence of 

 fine spiral sculpture. T. acutimargo, of which one is reminded by 

 Tryon's illustration, is much larger 16 mm., diam., and according to 

 the diagnosis is not ribbed but spirally striated, T. alboeineta has a 

 white keel band upon a darker color and it is besides not ribbed- 

 striate. (Mlldff.} 



T. GRANULOSA Mlldff. PI. 20, figs. 22-24. 



Shell openly umbilicated, convex-depressed, acutely carinated, 

 minutely granulated by transverse striae and fine spiral lines ; 

 corneous-tawny. Whorls 5i, slightly convex, the last a little exca- 

 vated below the keel, then convex, obtusely angulated around the 

 umbilicus. Aperture oblique, rounded rhomboidal; peristome 

 straight, arcuate. 



Alt. 6, greater diam. 14i, lesser 13 i mill. (Mlldff.} 



Siquijor, Philippines. 



