283 



closely arranged near the apex, and more distanl and 

 stronger near the month. Fine transverse and rarely longi- 

 tudinal striae are present. 



Tentaculites bellulus. Hall. | Fig. -2\~>.) I Pal. N. Y.. 

 Vol. V., Pt. II., p. 169, Pis. XXXI., XXXI. A.) 



Distinguishing Characters. — Elongate 

 conical form, becoming cylindrical towards 

 the mouth; apex attenuate, with close 

 acute annulations, the extreme portion 

 apparently smooth; annulations acute, 

 interspace rounded, with concentric striae. 



Found in the upper Moscow shales, at 

 Section 2 (?); in the Stictopora and De- 

 missa beds, at Section 5 (rare); five to fig. 215. Tentacu* 



P c j 1 1 , 1 T-i -it bellulus. Enlarged (after 



fourteen feet below the Encrmal limestone, Hail), 

 at Section 7. 



Tentaculites gracilistriatus. Hall. (Fig. 216.) (Pal. 

 N. Y., Vol. V., Pt. II., p. 173, Pis. XXXI., XXXI.A.) 



Distinguishing Characters. — Small size; general resem- 

 blance to S. fissurella; sub-equidistant annulations, with 

 wider interspaces ; smooth apical portion ; 

 continuous fine longitudinal stria?, invisible 

 to the unaided eve. 



Found in the upper Moscow shale ; especi- 

 ally abundant two feet below the Styliolina, 

 at Section 3 ; rarely in the Demissa bed four 

 feet below Styliolina, at Section 6 ; in the 

 upper Trilobite beds and associate shales 

 (rare) ; in the Transition and upper Marcel- ^ eSaSd^SftS 

 lus beds, on the Lake Shore (common). 



Genus COLEOLUS. Hall. 



[Ety. : Koleos, sheath.] 

 (1879 : Pal. N. Y., Vol. V., Pt. II., p. 184.) 



"Shell tubiform, extremely elongate conical, straight or 

 slightly curved, comparatively thick; inner walls smooth. 



Fig. 216. Tentacu 



