RHADINICHTIIYS CANOBIENSIS. 133 



Edge Coal Series : in shale accompanying an ironstone near the " North " Coal 

 worked at Niddrie, near Edinburgh ; Borough Lee Ironstone, Loanhead j Waliyford, 

 near Musselburgh. 



3. Rhadinichthys canobiensis, Traquair. 



EuADiNicHTHXS Geikiet, Traquair. Trans. Roy. Soc. Edinb., vol. xxx, 1881, p. 25, 



pi. i, figs. 13 — 18 (non Proe. Koy. Soc. 

 Edinb., vol. ix, 1877, p. 438). 



— — var. ELEGA>'TULU8, Traquaiv. Ibid., p. 27, pi. ii, 



figs. 1 — 5. 



— DELiCATULUS, Traquair. Ibid., p. 29, pi. ii, figs. 6 — 9. 



— EiiEOAHxuLUs, Traquair. Ami. and Mag. Nat. Hist. [6], 



vol. vi, 1890, p. 492. 



— — with variety delicatulus, Traquair. Proc. Roy. 



Soc. Edinb., vol. xviii, 1890, p. 398. 



— — A. S. Woodward. Cat. Foss. Fishes Brit. Mus., 



pt. ii, 1891, p. 464. 



History. — In my original essay on the Eskdale Ganoids, I identified the common 

 Hhadinicldhys of the Glencartliolm fish-beds with the little Redhall fish, to which I had in 

 1877 given the name of "^//. Geikiei," including, as a "variety," a form which I 

 named " elegmdidm^^ while I accorded the rank of a species to another closely allied 

 fish, namely JRh. delicatulus. 



Afterwards, in 1890, I published my conviction that " Geihiei" was only a synonym 

 oi " carinatus,^^ and therefore proposed to adopt '■'■ eleyuididus''^ as the name of the 

 Eskdale species including "delicatulus" as a variety. In this adjustment of the 

 nomenclature Dr. Smith Woodward, in the second part of his Catalogue, acquiesced. 



Since that time it lias, however, struck me that tiie name " eleyantulus^'' liaving been 

 originally proposed to designate a variety, must ren)ain confined to that variety, which 

 may indeed be elevated into a species by some future investigator, who may take up the 

 special study of these forms. According to this view a name is now wanting for the 

 species as a whole, and for that I beg to suggest the term " canohiensis.'^ 



General Characters of the Species. — Fishes resembling Eh. carinatus in general form 

 and dimensions, but having the denticulations of the posterior margins of the scales 

 fewer and coarser. 



A. The 'J'ypical Form. Plate XXX, figs. 1—6. 



Description. — Perfect specimens usually measure from 4 to 4^ inches in length ; a 

 somewhat larger size is, however, sometiuies indicated by examples of a more fragmen- 

 tary description. The shape is elegantly fusiform and j'alher slender; the length of the 



