111. 



WEALDEN AND PURBECK FOSSIL FISHES. 



slime-canal on the deepened flank-scales of the caudal region (Geol. Mag. [5], 

 vol. vi, 1909, p. 311), and there are similar traces in Plenropholis serrata described 



below (p. 121). 



Pleuropholis occurs chiefly in the Lithographic Stone (Lower Kimmeridgian) 

 of Bavaria and France, bul is also known by fragments in the Wealden of Belgium 

 (R. H. Traquair, " Les Poissons Wealdiens de Bernissart," Mem. Mus. Roy. Hist. 

 Xat. Belg., vol. v, 1911, p. 45, pi. ix, figs. 1—3). 



A. 



.-- — T"~ : v ' 



B. 



Fio. 35. — a. Pleuropholis attenuata, Egerton; type specimen, about twice nat. size. — Middle Purbeck 

 Beds : Apsel Lane, Sutton Mandeville, Wiltshire, b. Pleuropholis longicauda, Egerton; type specimen, 

 nut. size. — Middle Purbeck Beds; Swanage, Dorset, c, d. Pleuropholis serrat a, Egerton ; portions of 

 flank-scales, outer (c) and inner (d) views, enlarged. — Pm-beck Beds ; Hartwell, near Aylesbury, 

 Buckinghamshire. After Egerton. 



1. Pleuropholis attenuata, Egerton. Text-figure 35a. 



1854. Pleuropholw attenuatua, J. Morris {ex Egerton, MS.), Catal. Brit. Foss., ed. 2, p. 3:39 (name 



only). 

 1858. Pleuropholis attenuatus, P. XT. G. Egerton, Figs, and Descripts. Brit. Organic Remains (Mem. 



Geol. Surv.), dec. ix, no. 7, p. 1, pi. vii. fig. 1. 

 1895. Pleuropholis attenuata, A. S. Woodward, Catal. Foss. Fishes, Brit. Mus., pt, iii, p. 483. 



Type. — Imperfect fish ; apparently lost. 



I 'haracters. — The type species [known only by one specimen 5 cm. in 



length]. Length of head with opercular apparatus somewhat exceeding maximum 



nk and contained about five times in total length of fish; caudal 



slender, about half as deep as deepest flank-scale. Opercular bones 



