728 PROCEEDINGS OF THE ACADEMY OF [Oct., 



like strise. Constriction distinct, situated near or at the end of the 

 penultimate whorl, behind the lip. Aperture irregularly rounded, 

 the columellar side straight. Parietal callus small. Peristome ex- 

 panded and thickened or duplicated, the outer lip, in profile, seen to be 

 a little retracted or concave in the middle, projecting in a blunt point a 

 short distance from the upper insertion ; an angle outside at the junction 

 of the columellar and basal margins. 



Length 2.3, diam. 1.2 mm. 



Giiran, Taiwan. Types No. 89,967 A. N. S. Phila., from No. 1,369 

 of Mr. Hirase's collection. 



Smaller than any other known Formosan Diplommatina, and readily 

 distinguished by the retrogradeconstriction, sinuous outer lip, etc. It 

 resembles D. luchvana somewhat, but differs in the position of the 

 constriction, stronger basal angle, less distinct parietal callus, etc. It 

 occurred in some numbers {pravus, deformed). 



Slightly smaller specimens were taken at Suganiikei. At Hotawa 

 the sculpture is better developed. 



Falaina formosana n. sp. 



Shell sinistral, minute, pupiform, imperforate, yellow or pale brown- 

 ish-yellow, sculptured with delicate, distant, thread-like very oblique 

 riblets, about 7 in number on the last whorl, absent on the front of this 

 whorl, and verj^ weak on the penultimate whorl. Whorls 5, convex, 

 the first three regularly and rapidly increasing, the penultimate very 

 much swollen, predominating, the last whorl smaller, rapidly tapering to 

 the base, slightly constricted immediately above the aperture. Suture 

 well impressed , quite oblique. Aperture rounded , the peristome yellow, 

 narrowly expanded, doubled in old shells; the margins continued in a 

 callus with raised edge, spreading up above the aperture nearly to the 

 preceding suture. Columellar tooth small, deepl}' placed. 



Length 2, diam. 1.1 mm. 



Hotawa, Taiwan. Types No. 89,969 A. N. S. Phila., from No. 1,413 

 of Mr. Hirase's collection. 



This species belongs to the subgenus Cylindropalaina. It is the first 

 of its kind known from Formosa. The Indian Palaina gibherosa 

 Godwin-Austen {Land and Fresh-water Mollusca of India, II, p. 16, 

 pi. 66, figs. 12a-c) is closely related, but differs in being much wider 

 and more obese. 



Psendopomatias eos n. sp. 



Shell perforate, turreted, regularly tapering to the obtuse apex, rather 

 thin but strong, opaque greenish-corneous, with more or less brown on 



