1901.] NATURAL SCIENCES OF PHILADELPHIA. 195 



A. Umbilicus bounded by an angle : 



(i. Umbilical angle simple; whorls 8-J, . V. goniomplw.lus. 

 a'. Umbilical angle bearing a cord-like keel: 



b. Alt. two-thirds of the diam. Width of umbilicus 

 contained 4J times in diam. of base. Whorls 9, 



V. omphalotropis. 



b'. Alt. somewhat exceeding three-fourths the diam. 

 Umbilicus contained 3J times in diam. Whorls 9, 



V. Moellendorffi. 



Besides the differences between Moellendorffi and omphalotropis 

 given in the above table, the former has the base decidedly more 

 flattened. 



SUCCINEIDJB. 

 Succinea ogasawarae n. sp. 



Shell short and broad for the genus, squarish-oblong; very thin, 

 translucent and corneous with whitish streaks and clouds, rather 

 coarsely wrinkled in harmony with the lines of growth. Spire 

 excessively short, obtuse, flattened above, there being barely two 

 whorls separated by a comma-shaped suture; the last whorl quite 

 convex, its earlier portion very convex. Aperture very large, 

 eleven-twelfths the greatest length of the shell, very broadly ovate 

 in form. Greatest length of shell (measured obliquely to the 

 axis) 12.5, greatest width (measured at right angles to preceding) 

 8.5; convexity 4.8; longest axis of aperture 11.5, width 8J mm. 



Ogasawara (Bonin) Islands (Mr. Y. Hirase, No. 617a). 



A remarkable species, in which the spire is reduced to a mere 

 papilla, and the last whorl is large and convex. If the measure- 

 ments were taken in the conventional manner, the diameter would 

 about equal the altitude, but in a species so oblique in two planes 

 as this one, I have preferred to give measurements not involving 

 the direction of the coluraellar axis. 

 Succinea punctulispira n. sp. 



Shell ovate, very thin and fragile, pale yellow, subtranslucent, 

 the spire sometimes slightly tinted with red; sculpture of moder- 

 ately coarse growth wrinkles, and upon the spire and earlier portion 

 of the last whorl minutely and densely punctate, the pits arranged 

 in spiral series. Spire rather short and conically projecting, com- 

 posed of 2 \ whorls, the first one very convex; last whorl convex, 

 distinctly dilated or bell-shaped at the mouth. Aperture regularly 

 ovate, the outer lip evenly curved, columellar lip simple and 



