Contributions to Invertebrate Palaeontology. 607 



not only presents these same features, but the additional one of 

 having a small, nearly circular notch in the peristome near the 

 upper end of the outer lip, very closely resembling the minute 

 pore-like notch occurring near the upper angle of the aperture in 

 the genus Pupina Yignard ; or that seen in Anaulus PfiefiFer. 

 This latter feature is not present so far as I am aware in any genus 

 of operculated pulmoniferous shells ; at least not in the same degree 

 nor with the same apparent purpose that it occurs in the operculated 

 genera above mentioned. The last volution is also flattened or 

 contracted on the back in a very similar manner to that of Pupina, 

 as well as of many of the Pupae. It would therefore almost seem 

 as if in this little shell, of this early age, there were foreshadowed 

 features that afterwards pertained to these two groups of a later 

 J.ime ; although the projecting teeth within the aperture as here- 

 after described would preclude the possibility of an operculum in 

 this case. 



Genus AWTHRACOPUPA Whitf. 

 Am. Jour. Sci., vol. xxi, February, 1881, page 126. 



Shell minute, pupaform, with few volutions, the last one unsymmetrical ; 

 axis imperforate ; aperture large, nearly vertical ; peristome thickened, united 

 above by a thin callus on which may occur one or more palatal teeth ; other 

 tooth-like projections occur on the inner margin of the lip, and a small, nearly 

 circular notch, resembling that in Pupina, deeply indents the inner edge of 

 the outer limb near its junction with the body-whorl. Surface of the shell 

 marked by fine, nearly vertical lines. 



Type A. Ohioensis. 



Antliracopiipa Ohioensis. 



Plate XVI, figs, 15-17. 



Anthracopupa Ohioensis Whitf., Am. Jour. Sci., Feb. 1881, vol. xxi, p. 126. 



Shell small and robust, liaving a length of about three and one-third mm. 

 with a transverse diameter of about two mm., and consisting of about four 

 volutions, the last one extremely ventricose, except on the outer half, where 

 it is obliquely flattened and contracted, and with the aperture, forms about 

 three-fourths of the entire length of the shell. Aperture large, longer than 

 wide, and broadly rounded at the base ; lip thickened, rounded within and 

 forming a flattened thickened rim on the outside ; particularly on the lower 

 part. Labial notch situated very near the ixpper extremity of the lip, regular 

 in shape, and forming nearly two-thirds of a circle. A single tooth-like ridge 

 of moderate size extends inward from the lip at about the middle of tlie colu- 

 mellar side, and another of greater size projects nearly vertically from the 



