170 FOSSIL FISHES OF THE ENGLISH CHALK. 
Suborder CHONDROSTET. 
Family PoLvopontipa. 
Genus PHOLIDURUS, A. 8S. Woodward. 
Pholidurus, A. 8. Woodward, Proc. Geol. Assoc., vol. x1, 1889, p. 31. 
Generic Characters.—Not satisfactorily known. Caudal fuleral scales much 
resembling those of Psephurus, but broader and flatter, less pomted, and evidently 
indicating a stout, depressed fish. Caudal fin-rays coated with ganoine. 
1. Pholidurus disjectus, A. 8. Woodward. Text-figure 48. 
1889. Pholidurus disjectus, A. S. Woodward, loc. cit., p. 31, pl. i, figs. 4, 5. 
1895. Pholidurus disjectus, A. S. Woodward, Catal. Foss. Fishes B. M., pt. ii, p. 47. 
Type.—Fragment of tail; British Museum. 
Specific Characters.—The type species. Caudal fuleral scales very flat, with 
rounded and obtuse apex; their exposed surface ornamented with thick ganoine in 
irregular dots and short wavy lines, more or less clustered, especially near the 
margin. Caudal fin-rays very stout, the superficial ganoine thick and rugose, not 
always completely covering the exposed faces of the successive joints. 
Description of Specimen.—The type specimen is still the only known fragment 
Fra. 48. Pholidwrus disjectus, A. 8. Woodward; caudal fulcral scale (a) and base of some caudal 
fin-rays (B), nat. size—Chalk; Gravesend. (B. M. nos. 33221-24.) 
of this species, and comprises merely a few fuleral scales and portions of the stout 
rays of a caudal fin. One of the fulcral scales is shown of the natural size in Text- 
