﻿I'nANEROPLKUlUD.K 247 



Genus PHANEROPLEURON, Huxley. 

 [In Anderson's Dura Don, 1859, p. 67.] 



Body laterally compressed, covered with very thin scales of mode- 

 rate size ; snout acute. Marginal teeth conical ; dental plates with 

 ridges of well-separated conical tubercles. Paired tins acutely 

 lobate ; dorsal tin single, arising in advance of the pelvic pair and 

 continuous with the caudal ; anal fin small, separate. 



Phaneropleuron andersoni, Huxley. 



1859. Phaneropleuron andersoni, T. H. Huxley, in J. Anderson's Dura 



Den, p. G7, pis. v., vi. 

 1861. Phaneropleuron andersoni, T. H. Huxley, Figs. & Descrips. Brit. 



Organic Remains (Mem. Geol. Surv.), dec. x. p. 47, pi. iii. 

 18G2. Phaneropleuron, J. Powrie, Quart. Journ. Geol. Soc. vol. xviii. 



p. 434. 

 1872. Phaneropleuron andersoni, R. H. Traquair, Journ. Roy. Geol. Soc 



Ireland, n. s. vol. iii. p. 44, woodc. 



Type. Nearly complete fish ; British Museum. 



The type species, attaining a length of at least 0-35. Trunk 

 narrow and elongated, more than four times as long as the head 

 with the opercular apparatus ; tail produced and acutely pointed. 

 Marginal teeth high and conical. Scales very thin, marked with 

 delicate, granulated, radiating striae. 



Form, fy Loc. Upper Old Red Sandstone : Dura Den, Fifeshire, 



Fig. 39. 



Phaneropleuron andersoni, Huxl. — Eestored outline, by R. H. Traqwair. 



26120. A slab of yellow sandstone with remains of several indi- 

 viduals of Holoplycliius flemingi and Phaneroplevron 

 andersoni, including the type specimen of the latter, de- 

 scribed and figured in Anderson's ' Dura Den,' pi. vi. fig. 2, 

 and in the Mem. Geol. Surv. dec. x. pi. iii. fig. 1. One 

 fish exhibits the conical marginal teeth, another apparently 



