222 AULACOSPIRA. 



d l . Having parietal, columellar and lower 

 palatal teeth diani. 4 mm. Masbate. 



A. triptycha, no. 4. 



d-. Having 4 or 5 teeth ; diam. about 3 mm. 

 e. A minute basal fold present. 

 Luzon. A. scalatella, no. 5. 



G\ No basal fold. Tablas. 



A. rhombostoma, no. 6. 



a 1 . Last whorl rounded peripherally, not free in front; aper- 

 ture with 5 ( or 6 ) teeth ; peristorne not continuous. ( Subg. 

 Pseudostreptaxis.) Busuanga. A. azpeitiac, no. 7. 



1. AULACOSPIRA MUCRONATA (Mlldff.). PI. 38, fig. 1. 



See Man. Conch., vol. 8, p. 199. This is the most depressed 

 species, further distinguished by its toothless aperture. It is 

 from the west coast of Cebu. 



2. AULACOSPIRA HOLOLOMA (Mlldff.). PI. 38, figs. 6, 7. 



See Man. Conch., vol. 8, p. 198. Distinct by its trochoidal 

 form and narrow umbilicus. There are 4% whorls, not 5y 2 

 as stated by von Moellendorff, and repeated in vol. 8. Be- 

 sides the low columellar lamella, there is sometimes a low 

 callous ridge representing the parietal lamella. A specimen 

 measures : Alt. 2.1, diam. 3.4 mm. ; umbilicus 0.5 mm. 



Peak of Mt. Licos, Cebu. 



3. AULACOSPIRA PORRECTA Quadras et Moellendorff. PL 38, 

 fig. 2. 



The shell is openly umbilicate, conoid-depressed, thin, deli- 

 cately striatulate, brownish-corneous. Spire shortly conoid, 

 terraced. Whorls 4, flattened, keeled with an obtuse, but 

 little projecting keel, lightly furrowed above the keel. Last 

 whorl with the base a little convex; shortly bent down and 

 free. Aperture diagonal, ellipsoidal; peristome continuous, 

 very narrowly expanded throughout. Alt. 1.25, diam. rnaj. 3, 

 min. 2.66 mm. (Mlldff.}. 



Philippines : Ilin Island, near Mindoro. 



Aulacospira (Micropetasus) porrecta Q. et MLLDFF., 

 Nachrbl. D. Malak. Ges., xxvi, June, 1894, p. 95. 



