80 GANOID FISHES OF THE CARBONIFEROUS FORMATION. 



is visible, the posterior scales seem to differ slightly from those of the typical English 

 specimens, in the ridges having a somewliat greater tendency to bifurcation and 

 intercalation. Detached maxillge occurring in the same bed agree in form and sculpture 

 with that represented in PL XVII, fig. 4. 



Geological Position and Localities. — A fish of the lower part of the Upper Carbo- 

 niferous formation, unless the " Culm " at Instow, Devonshire, from whicli the 

 doubtful specimen referred to above was derived, belongs to a still lower horizon. 

 Millstone Grit Shales, Danebridge (Mr. J. Ward). Lower Coal Measures, Ciiviger 

 and Burnley, Lancashire; Halifax and Littleborough, Yorkshire (Wellburn) ; Cheadle 

 Coal-field, Staffordshire ; Dalemoor Rake Ironstone, Stanton, Derbyshire; " Four Foot "^ 

 Coal, Niddrie, near Edinburgh. Also in the Coal Measures at Crosshouse, Kilmarnock 

 (collection of Mr. Robert Dunlop). 



12. Elonichthys EGEiiT0>fr, Egerton, sp. Plate XVIII, figs. 1 — 3. 



PaLjEOKiscus Egeetoni, Agassiz. Poiss. Foss., vol. ii, pt. 1, 1844, p. 302 (name 



only). 



— — Eijerton. Quart. Journ. Geol. Soc, vol. vi, 1850, p. 5, pi. i, 



fig. 2, and Dec. Geol. Sun-., vi, 2, 1852. pi. ii. 



— — Hancock and Atthey. Ann. and Mag. Nat". Hist. (4), 



vol. i, 1868, p. 358, pi. xv, 

 figs. 3—5 ; pi. xvi, Cg3. 1, 2. 

 Elonichthys Egeetoni, Traq^uair. Quart. Journ. Geol. Soc, vol. xiiii, 1877, p. 553, 



and present v\ork, p. 22, pi. ii, fig. 8, 1877. 



— — Ward. Trans. N. Staff, Inst. Mining Engin., vol. x, 



1890, p. 171, pi. iv, figs. 1, 2. 



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



1891, pp. 494, 495. 



Specific Characters. — Attaining a length of four inches ; scales of moderate size, 

 nearly equilateral on the flank, highly ornate all over the fish, the ornament consisting 

 of very fine, yet sharp, closely set ridges, which frequently bifurcate, or are intercalated, 

 and are only slightly oblique on the anterior scales, though more so on those behind. 

 Paired fins rather small; dorsal and anal moderate; caudal large; anterior rays of 

 pectoral fins articulated for about a third of their length ; joints of median fins longer 

 than they are broad, relatively coarse, and striated. Laniary teeth stout in pro- 

 portion to the small size of the fish. 



Description. — The shape of this very pretty little fish is elegantly fusiform, the 

 length of tlie head, which is equal to the greatest depth of the body, being contained 

 rather more than four times in the total. The cranial roof bones are minutely 

 tuberculated, l)ut I have not succeeded in obtaining a good view of the sculpture ot 



