SUPPLEMENT. 
PLATE CXIV.- 
Tentaculites minutus. Hull. 
Page 5, 
An impei'fect individual, enlarged to six diameters, and showing veiy faint longitudinal strise. 
Clinton group. Rochester, Monroe county. 
Two entire individuals of the same species, similarly enlarged, showing the regular equidistant 
annuli and the tine annulations. 
Clinton group. Rochester', Monroe county. 
Tentaculites Niagarensis, Hall, var. Cumberlandi^, ii. vai-. 
Page 5. 
Figs. 3, 4, 5. Entire specimens, enlarged to six diameters, showing the slender, very tei’ete form, the con¬ 
spicuous, evenly rounded, irregularly distant annuli, and the fine, 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 gyracanthus. Eaton. 
Page 5. 
Figs. 7, 8 and 9. Individuals of this species, enlai-ged to six diameters, showing the great variation in the 
intervals between the annuli. The ornamentation of this species, though similar to that of T. 
Niagarensis, var. Cumbo-landice, is subject to greater variation, and the shell is stouter than in 
that variety. In figure 9, the shortei- specimen has been flattened and made to appear rela¬ 
tively too broad. 
Lower Helderberg group (Tentaculite limestone). Schoharie, Schoharie county. 
Fig. 10. A block of the Tentaculite limestone, showing the abundance of these individuals and the valua¬ 
tion in their surface ornamentation. 
Lower Helderberg group. Schoharie, Schoharie county. 
Fig. 11. Two large and 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 i-egular and closely set. 
Lower Helderberg group (Tentaculite limestone). Schoharie, Schoharie county. 
Tentaculites elongates. Hall. 
Page 6. 
Fig. 14. An ,individual of this species, natural size, from which a jiortion of the shell has been bi-oken, 
showing an apparently septate structure near the apex of the internal cavity, which is probably 
due to successive depositions of the filling matter. 
Lower Helderbeig group. Schoharie f Schoharie 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 the 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, Ch'ange county. 
Fig. 1. 
Fig. 2. 
