374 PALEONTOLOGY OF ILLINOIS. 



POLTPHEMOPSIS INOKNATA, M. and W. 



PL 31, figs. 8a, 8 J, 8 c. 



Loxonerna inornata, Meek and Worthen, October, 1860. Proceed. Acad. Nat. Sci. 

 Philad., p. 463. 



Shell small, conoid-subfusiform ; spire moderately elevated, 

 pointed but not attenuate at the apex ; volutions seven, nearly- 

 flat, increasing rather gradually in size, last one somewhat 

 prominently rounded in the middle, but not ventricose, form- 

 ing about two-thirds the entire length; suture rather shallow; 

 aperture narrow subovate, angular above and somewhat effuse 

 below ; columella arculate and tortuous ; outer lip thin, not 

 sigmoid in outline ; surface smooth or only showing very 

 obscure traces of fine striae of growth under a good lens. 

 Length, 0.38 inch; breadth, 0.18 inch; apical angle convex, 

 divergence about 30°. Length of aperture, 0.16 inch ; breadth 

 of ditto, 0.09 inch. 



This species resembles our P. peracuta somewhat, but is much smaller. It 

 is also proportionally shorter, and has scarcely more than half the number of 

 whorls; while its volutions are rather more convex, and its spire not near so 

 slender, nor so pointed. It also wants the inner lip of that species. Our spe- 

 cimens have the lip broken at the base of the aperture, so as to make the figure 

 8 a, appear as if the columella is more abruptly truncated, than is natural. 



Locality and position : Springfield, Illinois ; Upper Coal Measures. 



POLTPHEMOPSIS NITIDULA, M. and W. 



PI. 31, fig. 9a, 9 6. 



Loxonerna nitidula, Meek and Worthen, October, 1860. Proceed. Acad. Nat. Sci., 

 Philad., p. 465. 



Shell of medium size, subfusiform ; spire elongated, conical, 

 rather attenuate and acutely pointed above; volutions eight 

 to eight and a half, rather convex, last one comparatively large, 

 composing less than two-thirds of the entire length, somewhat 



