S U P P L E M E X T 



PLATE CXIV. 



Tentaculites minutus. Hall. 



Page j. 

 Fig. 1. An imperfect individual, enlarged to six diameters, and showing verj faint longitudinal strise, 



Clinton group. Rochester, Monroe county. 

 Fig. 2. Two entire individuals of the same species, similarly enlarged, showing the regular equidistanl 



annuli and the tine annulations. 



Clinton group. Rochester, Monroe county-. 



Tentaculites Niagarensis, Hull, var. Cumberland^*:, n. var. 



Page 5. 

 Figs. 3, 4, 5. Entire specimens, enlarged to six diameters, showing the slender, very terete form, the con- 

 spicuous, evenly rounded, irregularly distant annuli, and the tine, sharp interstitial annulations. 

 The surface ornamentation is very similar to that of T. Niagarensis, but the annulations are 

 much more conspicuous than in that species. 



Niagara group. Cumberland, Maryland. 



Fig. 6. A portion of another individual of this species, enlarged to nine diameters. 



Niagara group. Cumberland, Maryland. 



Tentaculites gyracaxthus. Eaton. 



Page 5. 

 Figs. 7, 8 and 9. Individuals of this species, enlarged to six diameters, showing the great variation in tin- 

 intervals between the annuli. The ornamentation of thisspecies, though similar to that of T. 

 Niagarensis, var. CumberlandiCB, is subject to greater variation, and the shell is stouter than in 

 that variety. In figure 9, the shorter specimen has been flattened and made to appear rela- 

 tively too broad. 



Lower Helderberg group (Tentaculite limestone). Scho/iarie, Schoharie county. 



Fig. 10. k block of the Tentaculite limestone, showing the abundance of these individuals and the varia- 

 tion in their surface ornamentation. 



Lower Helderberg group. Schoharie, Schoharie county. 

 Fig. 11. Two large anil somewhat flattened specimens referred with doubt to the same species. 



Lower Helderberg group (Tentaculite limestone). Jerusalem Hill, Herkimer county. 

 Figs. 12 and 13. Longitudinal sections of individuals, enlarged to six diameters, showing the thinness of the 

 shell, and the invagination of one shell within another. This is not an infrequent mode of 

 occurrence in this formation where the rock is sometimes almost wholly made up of these bodies. 

 In the specimens figured the annulations are unusually regular and closely set. 



Lower Helderberg group (Tentaculite limestone). Schoharie, Schoharie county. 



Tentaculites elongatus. Hall. 



Page fi. 

 Fig. 14. An individual of this species, natural size, from which a portion of the shell has been broken, 

 showing an apparently septate structure near the apex of the internal cavity, which is probably 

 due to successive depositions of the tilling matter. 



Lower Helderberg group. Schoharie ? Scluiharie county. 



Tentaculites acula. n. sp. 



Page 6. 

 Fig. 15. An individual of this species, natural size. 



Fig. 16. The same, enlarged to five diameters, showing the regularity of tin' annuli and the comparatively 

 few annulations on the intervals. 



Lower Helderberg group. Port Jervis, Orange county. 

 Fig. 17. A larger individual of the same species, from which a portion of the shell has been broken, showing 

 its thickness. Enlarged to six diameters. 



Lower Helderberg group. Port Jervis, Orange county. 



