284 



Fig. 217. Coleolus 

 tenuicinctum (after 

 Hall). 



Fig. 218. Coleolus 

 (?) gracilis. A speci- 

 men from the Demissa 

 bed, natural size. (Ori- 

 ginal.) 



Surface marked by anniilating; stri;p or rino-s, 

 which are more or less oblique, or sometimes 

 rectangular to the axis; sometimes longitudi- 

 nallj striated." 



Coleolus TENUICINCTUM. Hall. (Fig. 217.) 

 (Pal. N. Y., Vol. v., Pt. II., p. 185, Pis. 

 XXXIL, XXXII.A.) 



Distinguishing Cliaracters. — Long, taper- 

 ing, conical outline, with the diameter of 

 mouth G mm. in a specimen 7o mm. long; 

 concentric or oblique striti?, sinuate on one 

 side ; interrupted longitudinal striae. 



Found in the Xautilus bed, ori the Lake 

 Shore (rare). 



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

 (Pal. N. Y.. Yol. Y., Pt. II., p. 190, PI. 

 XXXII.A.) 



Distinguishing Cliaracters. — "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 Concliology, Vol. III., p. 107.) 



Shell elongated pyramidal, with the transverse section 

 varying from quadrangular to octagonal. Angles indented 

 by longitudinal grooves. The surface is variously orna- 

 mented by transver.se or reticulating striae. Near the apex 

 the shell is furnished w^ith a transverse septum. 



CoNULARiA UNDULATA. Courad. (Fig. 219.) (Pal. N. Y"., 

 Yol. Y.. Pt. II., p. 208, Pis. XXXIH., XXXIY.) 



