SEMION OTIDiE. 
53 
Type, Imperfect fish ; Newcastle-upon-Tyne Museum. 
A species about as large as the type, but more slender. Head 
with opercular apparatus occupying slightly less than one-quarter 
of the total length ; maximum depth of trunk equalling about twice 
that of the caudal pedicle and comprised at least five times in the 
total length. Head and opercular bones faintly rugose. Scales 
unornamented, not serrated, relatively larger than in the type 
species. 
Form, Log. Upper Permian (Magnesian Limestone): Durham. 
44211. Pish about 0‘06 in length, showing some of the supports of 
the anal and caudal fins, and an enlarged anal scale ; 
Pulwell Hill, near Sunderland. Purchased , 1873. 
P. 3482. Imperfect remains of a fish about 0-085 in length; 
Pulwell Hill. Enniskillen Coll. 
P. 4342 a. Specimen as large as the first showing only fragments of 
the fins ; Pulwell Hill. Enniskillen Coll. 
P. 4343. More imperfect smaller specimen ; Pulwell Hill. 
Enniskillen Coll . 
Acentrophorus altus (Kirkby). 
1862. Palceoniscus latus, J. W. Kirkby (gion Redfield), Ann. Mag. Nat. 
Hist. [3] vol. ix. p. 268. 
1864. Palceoniscus altus, J. W. Kirkby, Quart. Journ. Geol. Soc. vol. xx. 
p. 356, pi. xviii. fig. 1. 
1877. Acentrophorus altus, II. H. Traquair, ibid. vol. xxxiii. p. 565. 
Type. Imperfect fish ; Newcastle-upon-Tyne Museum. 
A species about as large as the type, but more robust. Head 
with opercular apparatus occupying at least one-quarter of the 
total length ; maximum depth of trunk equalling about twice that 
of the caudal pedicle, and comprised only three times in the total 
length. Head and opercular bones faintly rugose; operculum as 
deep as broad. Scales unornamented, not serrated. 
Form . <$f Log. Upper Permian (Magnesian Limestone) : Durham. 
The only known examples of this species were obtained from 
the Old Quarry, Fulwell, and there are none in the Collection. 
Acentrophorus glaphyrus (Agassiz). 
1835. Palceoniscus glaphyrus, L. Agassiz, Poiss. Foss. vol. ii. pt. i. p. 98, 
pi. x c. figs. 1, 2. 
1850. Palceoniscus glaphyrus, W. King, Permian Foss. (Pal. Soc.), 
p. 224, pi. xxii. fig. 3 (P fig. 4). 
