On the British Species of Asterolepidee. 283 
XXII. On the British Species of Asterolepide. By R. H. 
TRAQUAIR, M.D., F.RB.S. 
(Read 19th March 1890.) 
In a paper entitled “Notes on the Nomenclature of the 
Fishes of the Old Red Sandstone of Great Britain,” published 
in 1888, I adopted four British genera of Asterolepide, 
namely, <Asterolepis, Pterichthys, Bothriolepis, and Micro- 
brachius. To amend, to some extent, the conclusions arrived 
at in that paper is the object of the present communication. 
PTERICHTHYS. 
In 1888 I retained the following species :— 
A, Terminal division of arm slender, tapering. 
1, Pterichthys Milleri, Ag. (including P. latws, Ag.). Inferior surface 
of carapace broadly ovate. 
2. P. quadratus, Eger. Inferior surface of carapace peculiarly short in 
proportion to its breadth. 
3. P.cornutus, Ag. (including P. testudinarius, Ag.). Inferior surface 
of carapace narrowly ovate. 
B. Terminal division of arm expanded, abruptly pointed. 
4, Pterichthys productus, Ag. (including P. cancriformis, Ag.). Inferior 
surface of carapace narrowly ovate. 
5. P. oblongus, Ag. Inferior surface of carapace long and narrow, sides 
nearly straight. 
Nevertheless, both in the Geological Magazine and in a 
paper on the Asterolepide read before this Society,! I 
expressed my suspicions that these apparently different 
forms might, after all, belong in reality to one and the 
same species. 
In the second part of the “ Catalogue of the Fossil Fishes 
in the British Museum,” published in 1891, Mr A. Smith 
Woodward adopted my views, with this addition, that he, 
having fortunately discovered the type of P. latus, Egerton, 
which I had not seen, also included that supposed species 
among the synonyms of P. Milleri, Agassiz. He also corrected 
a mistake into which I had fallen by inadvertence, namely, 
in adopting the name cornutus instead of testudinarius for 
the other species with slender terminal arm-joint, seeing 
? Proc, Roy. Phys, Soc, Edin., vol. x., part i. (1888-89), p. 32. 
