APATEODUS. 37 



The most striking features of the cranium are the shortness of the otic region 

 and the narrowness of the interorbital region, due to the enormous size of the eye. 

 The articular end of the quadrate is seen on the right side of the fossil (fig. 3 a, qu.)y 

 and the mandibular suspensorium is proved to have been nearly vertical. The 

 maxilla {nix.) is clearly expanded behind. Each mandibular ramus is a thin 

 lamina, contracting to a point at the symphysis, as well represented in Agassiz's 

 fig. 4, loc. cit. The dentary is conspicuously ornamented with fine grooves radiat- 

 ing from the symphysis, and its oral border bears clustered minute teeth. The 

 angular is similarly ornamented. The opercular apparatus seems to have been 

 rather narrow and nearly smooth ; and on the left side of the fossil there are traces 

 of very long and slender branchiostegal rays. 



The base of the left pectoral fin is preserved (fig. 3, 7>c^.), comprising 12 delicate 

 rays, inserted distinctly above the ventral border. Traces of the much stouter 

 rays of the pelvic fins are also seen (fig. 3 a, plv.), situated far forwards. The 

 anteriorly placed dorsal fin (r/.) is represented only by the bases of 11 rays, most of 

 them rather stout, exposed in cross-section. The remote and small anal fin (a.) is 

 still more fragmentary. 



The scales in the type specimen are displaced and crushed over each other, so 

 that their exposed area is not so extensive as it must have been originally. They 

 are large and moderately thick, and apparently quite smooth. When their hinder 

 border is well preserved, it appears to form a gentle curve without any serrations. 

 There is a small triangular eminence on each scale traversed by the lateral line. 



Horizon and Localities. — Probably from a Turonian zone : neighbourhood of 

 Lewes. Undetermined horizon at Shalford, near Guildford. 



Familij Enchodontld/e. 



A family of Cretaceous fishes closely related to the existing Scopelida3, Odonto- 

 stomid?e (Text-fig. 8), and Alepisauridge, but distinguished from all of these by 

 having the margin of the upper jaw formed partly by the maxilla. The teeth are 

 firmly fused with the supporting bone, not implanted in sockets. 



Genus APATEODUS, A. S. Woodward. 



Apateodus, A. S. Woodward, Catal. Foss. Fishes B. M., pt. iv, 1901, p. 258. 



Generic Characters. — Head elongate and acutely pointed, and the flattened 

 cranial roof destitute of ornamentation. Premaxilla and maxilla extremely delicate, 

 the former being a vertical lamina with a uniform series of very small teeth : 



