1905.] NATURAL SCIENCES OF PHILADELPHIA. 729 



the last whorl and sometimes on the spire; glossy, sculptured through- 

 out with strong, nearly straight ribs, except the first whorl, which ap- 

 pears to be smooth. Wliorls 7, quite convex, the last rounded peri- 

 pherally and below. Aperture circular, vertical, the peristome reflexed , 

 thickened on the face, narrow where in contact with the preceding 

 whorl. There is a small notch or groove at the junction of the outer 

 and parietal margins of the peristome. 



Length 8, diam. 3.1 ; length of aperture 2.1, width 2.1 mm., including 

 peristome. Length 7.1, diam. 3 mm. 



Hotawa, Taiwan. Types No. 89,917 A. N. S. Phila., from No. 1,416 

 of Mr. Hirase's collection. 



This species stands close to P. amcenus Mlldff. of China. It is a little 

 more slender than the Chinese species, the last whorl is quite regular 

 in shape, and the umbilical slit is shorter. The genus is new to For- 

 mosa. 



Alycaeus (Dioryx) swinhoei H. Ad. 



P. Z. S., 1866, p. 318, pi. 33, fig. 11. Schm. and Bttg., Nachrbl., 1891, 



p. 189. 



Takao (Swinhoe); Bagsa (Schmacker) ; Suganiikei and Sammaipo 



(Hirase). 



Alycaeus hungerfordianus G. Nevill. 



Jour. Asiat. Soc. Beng., L, 18S1, p. 1-49. Mlldff., Jahrb., IX, p. 344, pi. 



10, fig. 6. 



Northern Formosa (Hungerford). 



[Alycceus mouhoti Pfr. has been erroneously credited to Formosa by 



Sowerby, Conch. Icon., XX, pi. 3, fig. 19.] 



Alycaeus varius n. sp. 



Shell openly umbilicate, depressed, the spire very low, convex, apex 

 projecting mucro-like; surface lusterless, ashen or dull reddish, rather 

 obsoletely striate, the striae stronger and crowded on the swollen part 

 of the last whorl, thinner, more delicate and subobsolete on the neck. 

 Wliorls 3j, the first corneous or reddish, the last swollen laterally, then 

 strongly contracted, slightly enlarged and deeply deflexed beyond the 

 contraction. Tube long. Aperture circular, oblique; peristome well 

 expanded, thickened within, the columellar margin wider. 



Alt. 2.5, diam. 4 mm. 



Taihoku, Taiwan. Types No. 90,244 A. N. S. Phila., from No. 1,383 

 of Mr. Hirase's collection. 



This species is related to A. laevicervix, but that has a smoother 

 neck and a shorter sutural tube. The aperture is peculiarly turned 

 inward. 



