AULOLBPIS. 85 



face is smooth or only marked by the very delicate concentric lines of growth. 

 Their covered area exhibits feeble traces of a few grooves radiating backwards 

 from the middle of the scale (PI. XVIII, fig - . 8). The lateral line traverses the 

 fourth scale of each series above the bent ventral scale. It is strongly marked, as 

 in C. radiant, but its short ridges are nearly always quite smooth. 



Horizons and Localities. — Zones of Holaster subglobosus to Terebratulina gracilis: 

 neighbourhood of Lewes, Sussex. Zone of Holaster subglobosus : Grlynde, Clayton, 

 and Arundel, Sussex; Reigate, Surrey; Hailing and Burhani, Kent. 



Genus AULOLEPIS, Agassiz. 



Aidolepis, L. Agassiz, Poiss. Foss., vol. v, pt. ii, 1844, p. 109. 



Generic Characters. — Head large ; trunk fusiform and laterally compressed, 

 with lower face of abdominal region flattened. Maxilla robust and arched, with two 

 supramaxillae ; mandible a little prominent, and gape extending to the back of the 

 large orbit ; teeth very small and conical. Anal fin small ; caudal fin deeply 

 forked. Scales smooth and not pectinated, large and regularly arranged, none 

 enlarged or thickened ; lateral line conspicuous. 



Type Species. — Aidolepis typus, from the English Chalk. 



Remarks. — -This genus is still known only by the type species. It differs 

 essentially from Otenothrissa in the non-pectination of the scales. The number of 

 the vertebras is uncertain ; and the dorsal fin is known merely by unsatisfactory 

 fragments. 



1. Aulolepis typus, Agassiz. Plate XIX, figs. 3, I. 



1837-44. Aidolepis typus, L. Agassiz, Poiss. Foss., vol. v, pt. i, p. 14 ; pt. ii, p. 109, pi. lx a, figs. 5—8 

 1888. Aidolepis typus, A. S. Woodward, Proc. G-eol. Assoc, vol. x, p. 324. 



1895. Aidolepis typus, A. S. Woodward, Proc. Zool. Sou., 1894, p. 660 (iu part), pi. xliii, figs. 4, 6 

 (non figs. 2, 3, 5). 



1900. Aidolepis typus, A. S. Woodward, Ann. Mag. Nat. Hist. [7], vol. v, p. 324, pi. ix, fig. 2. 



1901. Aulolepis typus, A. S. Woodward, Catal. Foss. Fishes B. M., pt. iv, p. 127. 



Type. — Imperfect fish from one of the Turonian zones ; British Museum. 



Specific Characters. — The type species, attaining a length of aboul 20 em. 

 Length of head with opercular apparatus somewhat exceeding half that of the 

 trunk from the pectoral arch to the base of the caudal tin. Anal tin nearer to the 

 caudal than to the pelvic pair. Lateral line extending along the fifth or sixth 



