1916.] NATURAL SCIENCES OF PHILADELPHIA. 169 



Schizobasis depressa sp. nov. PI. XXIV, tins g, 9, LO. 



Description. Shell of medium size, thick, porcellanous, depree 

 and globose, spire very low and smoothly rounded, rising slightly 

 al>ove the body whorl; protoconch broken away in type species; 

 conch paucispiral, the component whorls three and one half in 

 number, increasing regularly and rapidly in diameter, outer wall of 

 mie and one-half whorls of the apex broken away from spire of type; 

 sculpture coarse and dominantly spiral, seven low, round spirals on 

 body whorl, evanescing rather suddenly on body near aperture of 

 adult, posterior spiral less rounded and very near posterior suture, 

 obscuring suture line, interspiral spaces much narrower than spirals; 

 a deep spiral sulcus at base of body between anterior spiral and 

 umbilical keel; spiral sculpture consists of irregularly occurring 

 unequal costse shown on top of spirals and absent in interspiral 

 -paces; costse receding anteriorly, parallel to outer margin of aperture, 

 aperture circular, interrupted posteriorly by a slight shallow siphonal 

 notch and anteriorly by a slit which marks the entrance of the 

 anterior canal; outer lip simple: inner lip excavated, heavily rein- 

 forced; anterior canal rather short with parallel proximate margins 

 distorted so that it appear- as a narrow slit cutting across the base 

 of the shell directly at right angles with the axis; callus almost 

 filling the umbilicus; umbilical keel showing two poorly defined 

 varices; umbilical region spread out in a trigonal area and flattened 

 against the base of the columella. 



Dimensions. — Elevation, 18.-4 mm.; maximum diameter, 23.3 mm.; 

 spiral angle, 125° 40'. 



The type of this very interesting genus is represented in the Coon 

 Creek collection by a single perfectly preserved specimen. 



Occurrence. — Ripley Formation: Dave Weeks Place, on Coon 

 Creek, McNairy County, Tennessee. 



Family DELPHINULIDiE. 

 Genu> URCEOLABRUM gen. nov. 



Etymology: urceus, jug; labrum, lip. 



Type; Urceolabnun tuberculatum sp. nov. 



Shell small and porcellanous; trochoid in outline with a con- 

 spicuous aperture; apex acute, protoconch broken away in type 

 species, but scar small; sculpture cancellate, often tubercular at the 

 intersection of spirals and axial-; suture impressed; aperture circular 

 and much thickened around the rim, umbilicus wide and deep. 



This genus is proposed for a well-defined group of form- which are 



