282 



Genus STYLIOLINA. Karpixskv. 



[Ety. : Dimiimtive of the recent genus Styliola.] 



(1884 : Die fossilen Pteropoden am Ostabhange des Urals. Mem. de I'Acad. 

 St. Petersburg, 7th Ser., T. XXXII., No. 1.) 



Shells small, needle-shaped, \Yith a circular transverse sec- 

 tion. The apex is solid and nsnallv bulbiforni, and the sur- 

 face is smooth, with only fine lines of growth. 



Styliollna FissuiiELUA. ( Hall. ) ( Fio-. 214. ) ( Pal. N. Y., 

 Vol. v., Pt. II., p. 178, PI. XXXT.) 



DistinouisInn£r Characters.— Small 

 size; needle-Hke form; minute, of- 

 ten bulbiferous, ajiex; transverse 

 and sometimes longitudinal stria?; 

 sharply depressed central fracture 

 line in all the compressed specimens. 

 Found everywhere in tlie rocks of 

 Fig. 214. sfyiioUna fissureiia. til iw region ; especially abundant in 



A fragment of slate with niiiner- j_i i r^ i j_i in 



ous indivi.iuais, x 3, and a sped- the lower beiiesce, whei-e these shells 



meu much enlarged (after Hall). , ^, n. t t- ^• 



make up tlie Styliolina limestone; 

 also abundant in the Marcelkis shale, on the Lake Shore 

 (n(jt obsei'ved in the Encrinal limestone). 



Styliolina spica. (Hall.) (Fig. 211rA.) 

 (Pal. N. Y., Vol. v., Pt. II.; supplement, Vol. 

 VII., p. 7, PI. CXI V.) 



Distinguishing Characters. — Greater size 

 and moi-e robust form than S. fissureiia ; ab- 

 sence of indications of annulations or apical 

 node. 

 Fig. 314A. styiio- Fouud ill tlic Hamilton shales, at "Ham- 



lina spica, X S (after , -r-< • / 1 . n /tt n \ 



Hall). burg, Lrie County. (Hall.) 



Genus TENTACULITES. Schlotheim. 



[Ety. : Tentaeulum, feeler ; lithos, stone.] 

 (1820 : Schlotheim Petrefactenkunde, p. 337.) 



Shells straight, elongate, attenuately conical tubes, their 

 surfaces marked by strong rings or annulations, ^Y]licll are 



