144 GASTEROPODS. 



Pleurotomaria monilifera ( WHITE). 



Naticopsis monilifera White, 1883 : U. S. Geol. and Geog. Sur. Ter., 

 Twelfth Ann. Rep,, p. 163, pi. xlii, figs. 3i-c. 



Shell rather below medium in size, subglobose ; spire 

 short, blunt ; whorls five to six in number, the last very large ; 

 last two volutions with a prominent row of rounded tubercles 

 along the sutural lines ; surface otherwise smooth and polished. 

 Aperture subovate ; inner lip callous ; outer one thin, with 

 a somewhat bending margin. 



Horizon and localities. Upper Carboniferous, Upper 

 Coal Measures : Pleasant Hill, Kansas City. 



It is quite manifest, after an examination of the type speci- 

 men, that the shell described by White as Naticopsis monilifera 

 does not properly belong to Naticopsis as now understood. 

 And although the peripheral band has not as yet been made 

 out with absolute certainty, it seems very probable that this 

 form actually is a member of one of the sections of Pleurotoma- 

 ria, along with P. sphcerulata and others. 



Pleurotomaria broad head i WHITE. 



Plate xlviii, figs. la-b. 



Pleurotomaria broadheadl White, 1883: U. 8. Geol. and Geog. Sur.. Ter. 

 Twelfth Ann. Rep , p. 169, pi. xlii, figs la-b. 



Shell large, sub-globose; spire elevated, occupying nearly 

 half the Length; volutions six or seven, the last comparatively 

 large; peripheral band quite narrow and obscure. Aperture 

 somewhat ovate, slightly angular anteriorly: inner lip thin ; 

 outer labrum curved. Surface ornamented by 35 to" 40 de- 

 pressed revolving lines. 



Horizon and localities. Upper Carboniferous, Upper Coal 

 Measures : Kansas City, Clinton ( Henry county). 



