1889 - 90 .] Dr Traquair on Fossil Dipnoi and Ganoidei. 393 
the Carboniferous Limestone Series are specifically distinct both 
from Wardi and sulcatus, but unfortunately they are not sufficiently 
perfect to warrant the application of a new name. 
Sagenodus . — At the suggestion of Mr Smith Woodward, I adopt 
the term Sagenodus , Owen, for Ctenodont fishes of the type of 
obliquus, Atthey, and quinquecostatus , Traq.,in place of Hemictenodus, 
Jaeckel. Sagenodus inequalis seems pretty certainly to have been 
founded by Sir K. Owen on a microscopic section of a young speci- 
men of Gtenodus obliquus , Atthey {Trans. Odontolo. Soc., vol. v., 
1867, p. 395, pi. xii.), while on the other hand one cannot feel sure 
that Jaeckel was correct in referring Atthey ’s species to his genus 
Hemictenodus. 
Phaneropleuron . — I include Phaneropleuron with Gtenodus and 
its allies in the family Ctenodontidse, because the recent observations 
of Whiteaves, Jaeckel, and myself on specimens of Ph. curtum , 
Whiteaves, from the Upper Devonian of Scaumenac Bay, Canada, 
clearly show what I had long suspected in the case of Ph. Andefsoni , 
Huxley, that the configuration of the palatal bones and palatal 
dentition was essentially the same as in Gtenodus and Dipterus. 
Marginal teeth have, it is true, been also described by Huxley in Ph. 
Andersoni and by Whiteaves in Ph. curtum , but I do not consider 
that this character excludes it from the family. The name Cteno- 
dontidse is, I think, preferable to Pander’s “ Ctenododipterinse,” as 
Dipterus is the only member of the family known to us in which 
the dorsal fin is differentiated into two. 
Uronemidce. — Notwithstanding the great external resemblance of 
Uronemus to Phaneropleuron , I am constrained to put the former 
in a distinct family, owing to the fact that the dentition does not 
assume the form of “ctenodont” plates, and the shape of the 
palatal bones is quite different. In Uronemus these bones are 
broad plates, with only a row of teeth along the outer margin, the 
surface internal to which is simply granulated. Details as to the 
structure of Uronemus will be given in a subsequent memoir. 
Strepsodus minor , n. sp. — Scales about -J inch in length by J inch 
in breadth ; usually more or less quadrate or rectangular in aspect, 
the upper and lower borders being straight and parallel, the posterior 
border gently convex. Covered surface showing fine concentric striae, 
exposed area with radiating raised lines or feeble ridges, indicative 
