1905.] NATURAL SCIENCES OF PHILADELPHIA. 745 



slightly convex, rapidly increasing. Aperture rather large, the thin 

 lip acutely angular in the outer part, basal and columellar margins 

 arcuate, the latter delicately refiexed above. 

 ' Alt. 3, diam. 4 mm. 



Sammaipo. Taiwan. Types No. 89,881 A. N. S. Phila., from No. 

 1,417a of Mr. Hirase's collection. 



This remarkable Sitala is similar in shape to S. insignis of Japan, 

 but is very much larger. We know of no Chinese or Indian species of 

 like appearance. 

 Sitala angulifera n. sp. 



Shell imperforate, fragile, pale olive-green, subtransparent, acutely 

 carinate in the middle, conic above, convex below the keel. Sculpture 

 of rather coarse oblique wrinkles on the upper surface, the first whorl 

 with numerous low or inconspicuous spiral threads; the other whorls 

 showing some very weak cuticular spirals in a favorable light; base 

 with more widely spaced radial wTinkles, and a few spiral lines below 

 the keel. Spire straightly conic. Whorls 3^, the first one convex, 

 with subobsolete spiral lines, the last whorl nearly fiat above the peri- 

 phery. Aperture large, oblique, the thin peristome angular at the 

 keel, arcuate below; columellar margin narrowly refiexed above. 



Alt. 2, diam. 2.8 mm. 



Alt. 2.3, diam. 2.7 mm. 



Hotawa, Taiwan. Types No. 90,237 A. N. S. Phila., from No. 1,417 

 of Mr. Hirase's collection. 



The shell is similar to S. hirasei in shape, but decidedly smaller with 

 only 3^ whorls. The rounded apical whorl is nearly smooth, usually 

 without distinct spiral threads, and spirals are almost obsolete on the 

 last whorl. The base is free from spiral striae except for a few fine ones 

 just below the periphery. 



Sitala circumoincta taiwanica n. subsp. 



Shell larger than S. c. data Gude, with stronger spiral threads and 

 more whorls, fully 6. There are 6 or 7 spirals on each whorl. The 

 base is smooth. 



Alt. 2.2, diam. 1.7 mm. 



Hotawa, Taiwan. Types No. 89,903 A. N. S. Phila., from No. 1,411 

 of Mr. Hirase's collection. 



This is the largest of the circumcincta series. The IndiSin Sitala con- 

 ulus Blanf . is wider than the Japanese and Formosan forms, with more 

 minute spirals. It is a trifle wider than high, alt 2.9, diam, 3.1 mm.; 

 and while allied, it is doubtless distinct. 



