TEN. — THE.] 



PTEROPODA. 



393 



obtusa, Hall, 1879, Pal. N. Y., vol. 5, pt. 



2, p. 182, Ham. Gr. 

 spica, Hall, 1888, Pal. N. Y., vol. 7, p. 7, 



Ham. Gr. 

 Tentaculites, Schlotheim, 1820,Petrefakten., 



p. 377. [Ety. tentaculum, feeler ; Mhos, 



stone.] Straight, elongate, attenuately 



conical tubes, annulated by abruptly 



elevated rings closely arranged near the 



apex, and more distant and stronger 



with the increasing size of the shell 



and distance from the apex ; surface 



marked by fine transverse strise, rarely 



by longitudinal striae. Type T. scalaris. 

 acula, Hall, 1888, Pal. N. Y., vol. 7, p. 6, 



Low. Held. Gr. 

 arenosus, Hall, 1876, Illust. Devon. Foss., 



pi. 26, and Pal. N. Y., vol. 5, pt. 2, p. 



166, Oriskany sandstone, 

 attenuatus, Hall, 1876, Illust. Devonian 



Foss., pi. 26, and Pal. N. Y., vol. 5, pt. 



2, p. 170, Ham. Gr. 

 bellulus, Hall, 1876, Illust. Devonian 



Foss., pi. 26, and Pal. N. Y., vol. 5, pt. 



2, p. 169, Ham. Gr. 

 dexithea, Hall, 1888, Pal. N. Y., vol. 7, p. 



6, Schoharie grit. 

 distans, see Cornulites distans. 

 elongatus, Hall, 1859, Pal. N. Y., vol. 3, 



p. 136, Low. Held. Gr. 

 fissurella, see Styliola fissurella. 

 flexuosa, see Conchicolites flexuosus. 

 gracilistriatus, Hall, 1879, Pal. N. Y., vol. 



5, pt. 2, p. 173, Marcellus Shale, 

 hoyti, White, 1876, Proc. Acad. Nat. Sci., 



p. 34, Devonian, 

 gyracanthus, Eaton, 1832, (Echinus gy- 



racanthus,) Geo. Text-book, p. 128, Low. 



Held. Gr. 

 incurvus, Shumard, 1856, Geo. Rep. Mo., 



p. 195, Trenton Gr. 

 irregularis, Hall, 1859, Pal. N. Y., vol. 3, 



syn. for T. gyracanthus. 

 minutus, Hall, 1843, Geo. Rep. 4th Dist. 



N. Y., p. 72, and Pal. N. Y., vol. 2, p. 



183, Clinton Gr. 



Fig. 650.— Tentaculites rich- 

 mondensis. 



neglectus, Nicholson & Hinde, 1874, Can. 



Jour., p. 9, Clinton Gr. 

 niagarens i s , 



Hall, 1852, 



Pal. N. Y., 



vol. 2, p. 



352, Niag- 

 ara Gr. 

 niagarensis var. cumberlandise, Hall, 1888, 



Pal. N. Y., vol. 7, p. 5, Niagara Gr. 

 oswegoensis, Meek & Worthen, 1865, 



Proc. A.cad. Nat. Sci. Phil., p. 254, and 



Geo. Sur. 111., vol. 3, p. 342, Hud. Riv. Gr. 

 richmondensis, S. A. Miller, 1874, Cin. 



Quar. Jour. Sci., vol. 1, p. 234, Hud. 



Riv. Gr. 

 scalariformis, Hall, 1876, Illust. Devonian 



Foss., pi. 26, and Pal. N. Y., vol. 5, pt. 



2, p. 167, Up. Held. Gr. 

 scalaris, Schlotheim, 1820, Petref. Not an 



American species, 

 sicula, Hall, 1876, Illust. Devonian Foss., 



pi. 26, Up. Held. Gr. 

 spicula, Hall, 1876, Illust. Devonian 



Foss., pi. 26, and Pal. N. Y., vol. 5, pt. 



2, p. 172, Chemung Gr. 

 sterlingensis, Meek & Worthen, 1865, 



Proc. Acad. Nat. Sci. Phil., p. 255, 



and Geo. Sur. 111., vol. 3, p. 342, Hud. 



Riv. Gr. 

 subtilis, Winchell, 1866, Rep. Low. Pen- 

 insula Mich., p. 92, Ham. Gr. 

 tenuistriatus, Meek & Worthen, 1865, 



Proc. Acad. Nat. Sci. Phil., p. 255, and 



Geo. Sur. 111., vol. 3, p. 343, Hud. 



Riv. Gr. 

 Theca, Sowerby, 1845, syn. for Hyolithes. 

 aculeata, see Hyolithes aculeatus. 

 gregaria, see Hyolithes gregarius. 

 ligea, see Hyolithes ligea. 

 parviuscula, see Hyolithes parviusculus. 

 primordialis, see Hyolithes primordialis. 

 triangularis, Hall, 1847, Pal. N. Y., vol. 1, 



p. 313. This name was preoccupied by 



Portlock in 1843. Billings described it 



as Hyolithes americanus. 



