PROTOSPHYILENA. 



145 



The scales of the type specimen are exhibited partly from within, partly in 

 impression of the outer face (PI. XXX, fig. 6). Those traversed by the lateral 

 line are smooth, with only the slightest trace of the usual vertical ridge and feeble 

 marks of concentric growth-lines at the upper end. They are about four times as 

 deep as wide in the part of the trunk preserved. The scales below this series 

 appear to have been not deeper than wide, but the ventral scales are unfortunately 

 crushed upon them. Here again there are only marks of concentric growth-lines. 

 The rhombic dorsal scales, seen in another fragment (fig. 7), possibly even the 

 upper ends of the flank-scales themselves, are ornamented with a few discontinuous 

 ridges which run outwards from a low, smooth keel. 



Horizons and Localities. — Turonian zones : neighbourhood of Lewes and Brighton, 

 Sussex; Whyteleafe, Surrey; Folkestone, Kent. Zone of Holaster subglobosus : 

 Burham and Dover, Kent. 



Sub-order PROTOSPONDYLI. 



Family Pachycormidj?. 

 Genus PROTOSPHYRJENA, Leidy. 



Protosplnjriena, J. Leidy, Trans. Airier. Phil. Soc, vol. xi, 1857, p. 95. 



ErisicMhe, E. T>. Cope, Proc. Acad. Nat. Sci. Philad., 1872, p. 280. 



Pelecopterus, E. D. Cope, Vert. Cret. Form. West (Eep. U.S. Geol. Surv. Territ., vol. ii (1875), p. 244c. 



Generic Characters. — An imperfectly definable genus known only by the head. 



Fig. 42. Hypsocormus insignis, Wagner; restoration (without scales), about one fifth nat. size. — 

 Upper Jurassic (Lithographic Stone) ; Bavaria. From Catal. Foss. Fishes B. M., pt. iii, 1895. 



pectoral arch, and pectoral fins, which are closely similar to the corresponding- 

 parts of the Upper Jurassic genus Hypsocormus (Text-fig. 42). Rostrum ordinarily 

 much produced ; premaxilla large and triangular in shape. Dentition powerful, 



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