Makyland Geological Survey 485 



The writer has seen but a single specimen of this species. The con- 

 dition of preservation is such that no details could be learned further than 

 those given by the author of the species. 



Occurrence.- — Helderberg Formattok, Beckaft Member. Warren 

 Point, Pennsylvania. 



Collection. — Maryland Geological Survey. 



[Ohern.] 

 Tentaculites aculus Hall 

 Plate LXXXVII, Figs. G, 7 



TentaciiUtes aculus Hall, 1888, Nat. Hist. N. Y., Pal., vol. vii, p. 6 (supple- 

 ment to vol. v), pi. cxiv. figs. 15-17. 

 Tentaculites acula ? Weller, 1903, Pal. N. J., vol. ill, p. 336, pL xliii, fig. 11. 



Description. — " This species is distinguished by the regular, equi- 

 distant annuli and the few annulations on the intervals." Hall, 1888. 



Occurrence.- — Oriskany Formation, Shriver Member. 21st Bridge, 

 Cash Valley, ISTorth Branch. 



Collections. — Maryland Geological Survey, U. S. National Museum. 



[Ohern.] 



Tentaculites elongatus Hall 



Plate LXXXVII, Figs. 8-10 



Tentaculites elongatus Hall, ISIt^, Nat. Hist. N. Y., Pal., vol. iii, p. 13G, pi. vi, 

 figs. 16-21, 1861. 



Tentaculites elongatus Hall, 1888, Nat. Hist. N. Y., Pal., vol. vii, p. 6 (supple- 

 ment), pi. cxiv, fig. 11. 



Tentaculites elongatus Clarke, 1900, Mem. N. Y. State Mus., No. 3, vol. iii, 

 p. 27, pi. iii, figs. 8-12. 



Tentaculites elongatus Weller, 1903, Pal. N. J., vol. iii, p. 295, pi. xxxii, fig. 4; 

 p. 319; p. 363, pi. 1, figs. 4, 5. 



Description. — " Body extremely elongated and very gradually tapering 



to the apex, which is sometimes slightly curved; marked by strong, sharp 



annulations of wliich more than three occur in the space of the diameter 



of the tube. Section cylindrical. Surface ornamented by fine close an- 



nulating striae. Length from one to three inches. Annulations four or 



five in the space of a quarter of an inch at the base of the larger specimens, 



and about nine in the same space near the apex."' Hall, 1859. 



