PROTELOPS. 137 



Description of Specimen.— The only satisfactory specimen of this species 

 hitherto discovered is the type (PI. XXVIII, fig. 5). It is an imperfect head, 

 broken in the rostral region, but sufficiently well preserved to exhibit its generic 

 and specific characters. The typical constitution of the hinder part of the cranial 

 roof is clearly seen, and there is the usual longitudinally-extended median 

 depression. The comparatively short and deep postorbital cheek-plates (po.) are 

 three in number; and above them there appears to have been another plate (;».) 

 which extended forwards enough to meet the deep and narrow antorbital (ao.) 

 above the large orbit. There is a single suborbital (so.) below the eye. A trace 

 of an ossified sclerotic (sc.) is also seen. The premaxilla (pmx.) is a smooth 

 narrow bar, with a prominence rising from its middle ; its straight oral border 

 bears very slender conical teeth, which are larger than the other upper and lower 

 teeth. The maxilla (mx.) is also a smooth narrow bar, scarcely widening behind. 

 Its teeth are comparatively short and stout, the hindmost slightly inclined 

 forwards. The dentary bone (d.) is traversed on its outer face by a smooth, 

 rounded, longitudinal ridge, as in some species of Pachyrhizodus. Remains of its 

 conical teeth show that they had a large pulp-cavity. The remarkably short and 

 deep opercular apparatus is nearly smooth, but most of the operculum (op.) is 

 flaked away in the fossil. The expansion of the angle of the preoperculum (pop.) 

 seems to have been less, and the relative depth of the suboperculum (sop.) greater 

 than in the type species, T. salmoneus. In the pectoral arch the clavicle is 

 imperfect ; but the supraclavicle (scl.) and post-temporal (ptt.) are shown as 

 expanded plates, nearly smooth, but feebly marked with radiating furrows and 

 traversed by the usual slime-canal. The postclavicular scale (pel.) and a few 

 anterior scales are also ornamented with feeble radiating furrows. 



Horizon and Locality. — Probably zone of Holaster subglobosns : near Lewes, 

 Sussex. 



Genus PROTELOPS, Laube. 



Protelops, G-. C. Laube, Denkschr. k. Akad. Wiss., math.-naturw. CI., vol. 1, 1885, p. 286. 



Generic Characters. — Teeth consisting of a long and slender hollow base tipped 



by a relatively small enamelled crown ; of moderate size, more or less uniform, 



and not in sockets, but fused with the supporting bone ; arranged in two or more 



series on the border of the mouth and on the pterygopalatine arcade. 



Type Species. — Protelops geinitzi (Laube, loc. cit., p. 286, pi. i, fig. 1) from the 

 Turonian of Prague, Bohemia. 



1. Protelops anglicus, A. S. Woodward. Plate XXIX, figs. 1, 2. 



1888. Stratodus anglicus, A. S. Woodward, Proc. Geol. Assoc, vol. x, p. 314, pi. i, figs. 3, 4. 

 1901. Protelops anglicus, A. S. Woodward, Catal. Foss. Fishes B. M., pt. iv, p. 57. 



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