AULACOSPIBA. 223 



All of the specimens seen have a columellar lamella. It is 

 very blunt and low, not lamelliform, being a rather diffuse 

 tubercle. There is also, in some examples, a low callous ridge 

 representing the parietal lamella. As in the other angular 

 species, there is a microscopic sculpture of spiral lines. It 

 resembles A. hololoma in teeth, but not in shape. 



4. AULACOSPIRA TRIPTYCHA Quadras & Moellendorff. 



The shell is rather openly umbilicate, discoidal, thin, deli- 

 cately sculptured with arcuate, fold-like stria?. Spire shortly 

 conoid, somewhat terraced. Whorls 4i/, flattened, nearly free 

 at the deep suture, the last whorl obtusely keeled at the 

 periphery, slightly impressed above the keel, nearly flat at the 

 base. Aperture almost horizontal, obliquely oval, having three 

 teeth : one on the parietal, one basal and one horizontal, 

 lamelliform columellar. Peristome continuous, appressed 

 above, the upper margin straight, outer and basal narrowly 

 expanded, columellar margin somewhat reflected. Alt. 1.75, 

 diarn. 4 mm. (Mttdff.). 



Philippine Is.: Mt. Bathuan, near the village of Palanoc, 

 island of Masbate. 



Aulacospira triptycha Q. et M., Nachrbl. D. Malak. Ges., 

 xxvii, June, 1895, p. 76. 



The "basal" tooth mentioned is evidently the lower palatal 

 plica, which is situated rather low in this genus. I have not 

 seen the species, and it has not been figured. 



5. AULACOSPIRA SCALATELLA Moellendorff. PI. 38, figs. 8. 9. 

 See Man. Conch., vol. 8, p. 199 ; vol. 9, pi. 64, figs. 10-12. 



This species has five teeth : the parietal and columellar lamel- 

 lae, upper and lower palatal plica?, and a small basal fold. 

 The columellar lamella ascends obliquely. A specimen meas- 

 ures, alt. 1.5, diam. 2.9 mm. 



Village of Aiitipolo, Manila Province, Luzon. 



6. AULACOSPIRA RHOMBOSTOMA Moellendorff. PL 38, fig. 13. 

 The shell is moderately but openly umbilicate, conoid- 

 depressed, thin, delicately striatulate, opaque, corneous-buff; 

 spire moderately elevated, somewhat terraced, the apex ob- 



