ICHTHYODECTES. 



97 



the accompanying outline-restoration (Text-fig. 23). The upper jaw is not 

 identifiable with certainty, but the premaxilla shown of the natural size in PL XIX, 

 fig. G, probably belongs to I. minor. This bone is less than twice as deep as broad, 

 and bears a slight ridge down the middle of its outer face. Its oral margin is 

 gently convex and has five teeth, which are nearly equal in size. The three 

 middle teeth are well preserved and closely resemble the mandibular teeth of 

 I. minor in shape. The dental crown at each end of the series is broken away. 

 On the inner abraded face of the bone one successional tooth is seen adjoining the 

 base of its functional predecessor, not directly beneath it. 



Horizons and Localities. — Turonian zones : Sussex and Kent. Zone of Holaster 

 subglobosus : Dorking, Surrey; probably also neighbourhood of Burliam, Kent. 



2. Ichthyodectes elegans, Newton. 



Text-figure 24. 



1877. Ichthyodectes elegans, E. T. Newton, Quart. Journ. Greol. Soc, vol. xxxiii, p. 521, pi. xxii, fig. 15. 

 1901. Ichthyodectes elegans, A. S. Woodward, Catal. Foss. Fishes B. M., pt. iv, p. 103, pi. ix, figs. 4, 5. 



Type. — Imperfect dentary from zone of Holaster subglobosus ; British Museum. 



Specific Characters. — Slightly smaller than /. minor. Oral border of dentary 



bone somewhat concave, curved upwards to the beak-like symphysis ; its outer 



{ 



Fig. 24. Ichthyodectes elegans, Newton ; outlines of left maxilla, outer aspect (ma!.) and dentary, inner aspect (d.), 

 nat. size. — Zone of Holaster subglobosus ; Upper Hailing, Kent. Harford Collection (B. M. nos. P. 5644 — 45). 



face gently sinuous, not sharply bent or ridged ; its teeth very small at the sym- 

 physis, but of moderate size and in regular series beyond, the crowns slender, all 

 inclined a little forwards, with the apex slightly curved inwards ; total number of 

 tooth-sockets in dentary about 40. Maxilla scarcely deepened in front, and its 



13 



