877 



Rhiz. 



Philada. Yol. 8, 1-57. Also, Pal. Ohio, Vol. 1, 1873, p. 342, pi. 

 39, fig. 9. Dawson's Acadian Geology, 1868, page 210, fig. 56, 

 a. tooth, J scale; not distinguishable from Newberry's species ; 

 teeth in Ohio, not infrequently found detached from the jaw, 

 with large fish scales {Bhizodus quadratus ?) Oannel base of 

 Coal No. 6, Linton, O. Joggins section, Nova Scotia, division 

 4, bed 6, full of fishes of four genera. XIIL 



Rhizodus quadratus, Newberry. Pal. Ohio, Vol. 1, 1873, 

 viii '^- ...^.^c^.^ .^^ O page 343, plate 39, 



fig. 8, natural size 

 of scale of some 

 ganoid fish, thin, 

 squarish, nearly 

 smooth, margins 

 finely striated, and 

 showing concentric 

 lines of growth, 

 central area mark- 

 ed by fine net- 

 work of threads- 

 Never yet found 

 actually connected 

 Distinct species from British 



VolJ, 



jDl.XW«t 



with the teeth E, lancifer. 



Bhizodus of Hibbert. — Linton, O. XIIL 



B.hizodus ? Large fish scales, or plates, are occasionally 



to be collected from the black calcareous shales overlying Ste- 

 venson's Upper Barren limestone No. Ill, Washington Co. Pa. 

 (K, pp. 50, 225; K 3, pp. 306, 310.) XVL 



Rhizomorpha sigillarise, (Q, p. 55.) XIII, 



Bhodia radians. See Rhacophyllum adnascens. XIII 



Rhombodietya diseum, Whitfield. Bull. Amer. Mus Nat. 

 Hist. N. Y., Vol. 1, No. 8, 1886, page 348, plate 35, fig. 1, na- 

 tural size,, a sponge frond with distinct threads or rods, com- 

 paratively thick substance pressed into the shale so as to im- 

 bed edges; probably globular when alive; numerous speci- 

 mens found in a layer of the Norman's Kill shale, Albany Co., 

 N. Y., only a few feet from the outcrop of the Graptolite bed 

 described in Pal. N. Y. Vol. 1, and in 12th, 13th and 29th re- 



