﻿314 ARTHEODIRA. 



Phyllolepis concentrica, Agassiz. 



1844. Phyllolepis concentricus, L. Agassiz, Poiss. Foss. V. G. R. p. 67, 



pi. xx iv. fig. 1. 

 1862. Phyllolepis concentricus, W. Davies, Geologist, vol. v. p. 458. 

 1888. Phyllolepis concentricus, A. Fritsch, Fauna der Gaskohle, vol. ii. 



p. 89, woodc. fig. 169. 



Type. Imperfect dermal plate ; unknown. 



The type species, of large size. Superficial rugae coarse, rounded 

 or slightly angulated, somewhat wavy, and separated by spaces two 

 or three times their own width. 



Form. Sf Loo. Upper Old lied Sandstone : Perthshire and Fife- 

 shire. (?) Devonian : Meadsfoot, Torquay. 



P. 3292. Specimen measuring 0*095 in its longest diameter, so far 

 as preserved, and having one long border obtusely angu- 

 lated ; Dura Den, Fifeshire. The fossil must have been 

 gently convex, but it occurs chiefly as a concave impres- 

 sion, from which is taken the plaster cast figured by A. 

 Fritsch, loc. cit. Ennishillen Coll. 



P. 5096. Fragment of plate ; Clashbennie, Perthshire. 



Presented by John Edward Lee, Esq., 1885. 



Other plates of this genus have been described under the follow- 

 ing names : — 



Phyllolepis delicatula, J. S. Newberry, Palaeoz. Fishes N". America 

 (Mon. U. S. Geol. Surv. no. xvi. 1889), p. 97, pi. xix. 

 fig. 11. — Chemung Group (Upper Devonian); Bradford 

 Co., Pennsylvania. 



Phyllolepis corneti, M. Lohest, Ann. Soc. Geol. Belg. vol. xv. 

 (1888), p. 157, pi. x. fig. 6. — Upper Devonian ; Strud and 

 Chevreniont, Belgium. [M. Lohest Collection, Liege.] 



Phyllolejjis undulata, M. Lohest, ibid. p. 157, pi. x. figs. 3-5, 

 pi. xi. fig. 9. — Upper Devonian ; Strud, Chevremont, and 

 Evieux, Belgium. [M. Lohest Collection.] 



Genus HOLONEMA, Newberry. 

 [Palaeoz. Fishes N. America, 1889, p. 92.] 



Dermal plates marked with irregularly branching, radiating rugae. 

 The form of the median ventral plate of this genus (figured by 



