156 PALEONTOLOGY OF NEW YORK. 



In 1842 Mr. Vanuxem indicated the occurrence of Tentaculites ornatus of 

 Sowerby, in the water-lime group of New York (Hydraulic lime rock of Eaton), 

 giving a figure of the species which occurs in the Tentaculite limestone. 



In 1843 Mr. Mather adopted and published the same figure, as characteristic 

 of the Tentaculite limestone, which was at that time recognized as the 

 upper member of the water-lime group {Geology of N. Y. Surv. First and 

 Third Geolog. Dist). 



In 1843 M. Castelnau described and figured Tentaculites regularis .and T. 

 irregularis, from the Trenton limestone {Le systeme Silurien de V Amerique Sep- 

 tentrionale).* 



In 1843 James Hall indicated Tentaculites scalaris, of Schlotheim, as occur- 

 ring in the Corniferous limestone at Le Roy, in western New York. He also 

 described and illustrated a new species, T. fissurclla, from the Marcellus shale 

 and Genesee slate {Geology of N. Y. Surv. Fourth Geolog. Dist). 



In 1847 the same author described and figured Tentaculites ? flexuosa, from the 

 Trenton limestone {Paleontology of New York, vol. 1, pp. 92, 284, plates 29 

 and 78).f 



In 1852 the same author described three species from the Clinton and Niagara 

 groups of New York, viz., T. minutus, T. distans\ {Paleontology of New York, 

 .vol. 2, pp. 183, 184, pi. A 41, figs. 8 a-e, and 9 a, b); and T. Niagarensis (p. 352, 

 pi. 85, figs. 11 and 12). 



* The occurrence of these two forms at Trenton Falls has not been verified by subsequent collections at 

 that locality ; -nor have these or any other species of true Tentacolites been found in the Trenton limestone 

 either at that locality or elsewhere in New York. The name T. irregularis, of Castelnau, is suggestive 

 of the characters of T. gyracanthus, which species may have been obtained from collectors living- at 

 Trenton Falls. The dark limestone in which it occurs is so similar to that of Trenton Falls that the 

 character of the rock may also have influenced the conclusion that the specimens were from the Trenton 

 limestone. 



t This species was referred to Tkntaculitks with doubt. The apparently septate character is due to 

 exfoliation of the exterior test, revealing 1 the character of Coknulitks ; and in the reference to the species 

 on page 284, it was compared with Cornulites serpuiarivJi of Schlotheim, as figured by Mrminso.v (Sil. 

 .s.,./.  . I .-v ).!■■■ -e.l i loii I its of its identity willi Ti-.m u:i 1,1 n-.s on M.vnimt of its *■ :i- 1 hi't-in.^ to other lio.lies." 

 as well as "from its internal structure, which has not heretofore been shown in true Tk.ntaciilitem." "All 

 the other sjiecies known in our strata are straight [or slightly l»nt fnun accidental causes during growth], 

 ridged, and gradually tapering to a point, always separate, and never known as adhering to ether bodies." 

 Subsequent examination has shown this fossil to be the base of a Cou.vulitbs, growing in small groups, and 

 attached to other bodies. 



( The relations of this species require to be verified. 



