ZOOGENETES. 195 



stances, as I have riot seen the shells, they are left in Acan- 

 thinula. 



ACANTHINULA PERPUSILLA Mlldff. 



Shell moderately, deeply umbilicate, globosely turbinate, 

 thin, subpellucid, most minutely striate, nearly smooth, cor- 

 neous-fulvous. Spire much elevated, the sides rather convex. 

 4% moderately convex whorls, subangular at the suture, the 

 last very shortly descending in front. Aperture moderately 

 oblique, broadly ovate, the peristome slightly expanded, colu- 

 mellar margin rather deeply sinuate, dilated. Diam. and 

 height 1.5 mm. (Mlldff.). 



Java (Fruhstorfer). 



Acanthinula perpusilla Moellendorff, Nachrbl. D. M. Ges., 

 vol. 29, 1897, p. 66. 



Acanthinula ttluana Mlldff. 



Shell narrowly umbilicate, elevated-turbinate, minutely stri- 

 atulate, corneous-buff. Spire strongly raised with somewhat 

 convex sides. Whorls 5, moderately convex, somewhat flat- 

 tened in the middle, the last scarcely descending. Aperture 

 rather oblique, oviform; the peristome very narrowly ex- 

 panded, columellar margin slightly sinuate, somewhat thick- 

 ened, a little dilated above. Diam. 1.33, alt. 1.5 mm. (Mlldff.). 



Java (Fruhstorfer). 



Acanthimda tiluana Moellendorff, Nachrbl. D. M. Ges., 

 vol. 29, 1897, p. 66. 



Genus ZOOGENETES Morse. 



Zoogenetes and Zoogenites Morse, Journ. Portland Soc. N. 

 H., i, 1861, p. 32, for Helix harpa Say. 

 Helix and Acanthinula of many authors. 



The shell is thin and elastic, narrowly umbilicate, ovate- 

 conic, higher than wide, of few rapidly increasing, convex 

 whorls, the first two smoothish, the rest having delicate, 

 widely-spaced, oblique riblets. Aperture ovate, oblique, the 

 lip thin and simple, dilated near the columellar insertion, 

 margins remote. 



The margins of the foot are crenulated; head with crenu- 



