314 
ARTHRODIRA. 
Phyllolepis concentrica, Agassiz. 
1844. Phyllolepis concentricus , L. Agassiz, Poiss. Foss. Y. G. JL 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. Ij69. / A$ p. t/nXr.ft&ieA&kJ 
H D ^ ,n'S < ‘ i />ro py. 
Type. Imperfect dermal plate ; utfeewi. 
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. # Loc. Upper Old Bed 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. FnnisJcillen Coll . 
P. 5096. Fragment of plate ; Clashbennie, Perthshire. 
Presented by John Echvard 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 
Chevremont, Belgium. [M. Lohest Collection, Liege.] 
Phyllolepis unclulcitci , M. Lohest, ibid. p. 157, pi. x. figs. <3—5, 
pi. xi. fig. 9.—Upper Devonian; Strud, Chevremont, and 
Evieux, Belgium. [M. Lohest Collection.] 
pL'y.iA. 
$ A . Jr . , ' £ ® * p _ 
Genus HOLONEMA, Newberry. 
[Palseoz. Fishes N. America, 1889, p. 92.] 
Dermal plates marked with irregularly branching, radiating rugas. 
The form of the median ventral plate of this genus (figured by 
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