284 



Fig. 217. Coleolus 

 tenuicincbum (after 



Hall). 



Fig. 218. Coleolus 

 (?) gracilis A speci- 

 men from the Demissa 

 bed. natural size. (Ori- 

 ginal. ) 



Surface marked by annulating stria' or rings, 

 which are more or less oblique, or sometimes 

 rectangular to the axis; sometimes longitudi- 

 nally striated." 



Coleolus tenuicinctum. Hall. (Fig. 217.) 

 (Pal. X. Y., Vol. V., Pt. II., p. 185, Pis. 

 XXXII., XXXII.A.) 



Distinguishing Characters. — Long, taper- 

 ing, conical outline, with the diameter of 

 mouth 6 mm. in a specimen 75 ram. long; 

 concentric or oblique striae, sinuate on one 

 side; interrupted longitudinal stria 1 . 



Found in the Nautilus bed, on the Lake 

 Shore (rare). 



Coleolus (?) gracilis. Hall. (Fig. 218.) 

 (Pal. N. Y., Vol. V., Pt. II., p. 190, PI. 

 XXXII.A.) 



Distinguishing Characters. — "Form ex- 

 tremely attenuate, slightly curving, elongate, 

 cylindro-conical, tubular; shell compara- 

 tively thick; surface unknown, but ap- 

 parently transversely striate." 



A specimen agreeing with this descrip- 

 tion was found in the Demissa bed, at Sec- 

 tion 5. 



Genus CONULARIA. Miller. 



[Ety. : Conulus, little cone.] 

 (1821: Sowerby's Mineral Conchology, Vol. III., p. 107.) 



Shell elongated pyramidal, with the transverse section 

 varying from quadrangular to octagonal. Angles indented 

 by longitudinal m-ooves. The surface is variously orna- 

 raented by transverse or reticulating striaj. Near the apex 

 the shell is furnished with a transverse septum. 



Conularia undulata. Conrad. (Fig. 219.) (Pal. N. Y., 

 Vol. V.. Pt. II., p. 208, Pis. XXXIIL, XXXIV.) 



