Maryland Geological Survey 687 



Tentaculites spiculus Hall 

 Plate LXX, Fig. 24 



7'entaculites spiculus Hall, 1876, Illustrations of Devonian Foss., Pteropoda, 



pi. xxvi, figs. 21-25. 

 Tentaculites spiculus Hall, 1879, Pal. N, Y., p. 172, pi. xxxi, flgs. 21-25. 

 Tentaculites spiculus Grabau and Shimer, 1910, N. Amer. Index Foss., vol. 



ii, p. 12. 



Description. — " Form a slender-elongate, aninilatecl cone : ver\' gently 

 expanding from the apex, and soinctimes sliowing a tendencj' to cylin- 

 dricity towards the aperture; annulations abruptly elevated, sometimes 

 rounded and oblique to the axis of the cone; about equal to the spaces 

 between them, and gradually increasing in distance towards the aperture; 

 ten to fourteen annulations in the space of five mm. in specimens of the 

 same size; apical portion very finely annulated or transversely striate, 

 about twenty in the length of one mm., vv'hile an equal distance measured 

 near the aperture gives eleven annulations. Interannular spaces on the 

 liody of the shell marked by fine transverse striae, to be seen only under 

 favorable conditions of the fossil."' Hall, tSTi). 



Length mm.; dianu'ter 1 mm. 



This characteristic species of tlie Ithaca of Xew York occurs also in 

 the Ithaca fauna of Maryland. 



Occurrence.' — Jennings Formation, Woodmont Member, Ithaca 

 Fauna. Millstone, 795. 



Collection. — Maryland Geological Survey. 



Family TORELLILLIDAE 



Genus COLEOLUS Hall 

 COLEOLUS TENUICINTUS Hall 



Plate LXXI, Figs. 4-6 



Coleoprion tenuicintum Hall, 187G, Illustrations of Devonian Foss., Ptero- 



poda, pi. xxvii, figs. 1-4. 

 Coleolus tenuicinctum Hall, 1879, Pal. of N. Y., vol. v, pt. ii, p. 185, pi. 



xxxlia, flgs. 6-10. 

 Coleolus tenuicinctus Grabau and Shimer, 1910, N. Amer. Index Foss., vol. 



ii, p. 9, fig. 1219. 



