HALEC. 49 



by fragments (a.). The caudal fin ('•.) seems to liave been forked, but only the 

 l)ases of its stout rays remain. There are no traces of scales, but the Ijody is shown 

 to have borne longitudinal series of honj scutes. In front of the dorsal fin, there 

 is a chain of four or five large ovoid or rhomboidal scutes exposed from the inner 

 aspect. These (i) are very slightly saddle-shaped, and only overlap to quite a 

 small degree. Where their substance is broken away, the impression of an external 

 ornament of radiating, tuberculated ridges is observable. They have, indeed^ the 

 appearance of median dorsal ridge-scutes, like those occurring in the American 

 species of GimoUchthys (see ' Catal. Foss. Fishes B. M.,' pt. iv, 1901, p. 224, fig. 8). 

 Immediately below the dorsal fin there are the partially displaced remains of a 

 series of small scutes, more distinctly rhomboidal in shape, exposed from the outer 

 aspect (ii). Remains of other scutes of this series are also seen scattered at various 

 points behind the dorsal fin. The exposed portion of each of these scutes is longer 

 than deep, with a sharp median longitudinal ridge, from which finer ridges and rows 

 of tul^ercles radiate to the periphery. The series may have been disposed along the 

 course of the lateral line, but none of the scutes display any distinct traces of the 

 slime-canal. Another paired series of scutes (iii) is well seen at the distorted 

 ventral liorder of the trunk between the paired fins, with traces of its continuation 

 further backwards. These scutes are exposed from the outer face on the right, but 

 from the inner face on the left side of the fish ; and they are very similar to those 

 of series no. ii just described. All of them are imperfect, but one marked x 

 in PI. XII, fig. 5, is more satisfactorily preserved than the majority, and is repre- 

 sented of twice the natural size in fig. 5 a. The anterior, smooth, overlapped 

 portion is narrow and extended ; and some of the radiating ridges on the exposed, 

 portion are more prominent than the others. The scute at the base of the pelvic 

 fin is much enlarged, with the hinder margin notched to adapt it to its situation. 



Horizons and Localities. — Zones of Holaster suhglohosus to Terehratulina 

 gracilis : neighbourhood of Lewes, Sussex ; Burham, Kent. Zone of Holaster 

 snhglohosus : Hailing, Folkestone, and Dover, Kent ; Glynde, Sussex. Zone of 

 Terehratulima gracilis : Warlingham, Surrey. Zone of Micraster corangninuvi : 

 South Croydon, Surrey ; Thanet, Kent. Also teeth in higher zones prol)al)ly of 

 this species. 



Genus HALEC, Agassiz. 



Halec, L. Aj^assiz, Verhaudl. Ges. vaterl. Mus. Bohnicu, 1834, p. 67. 

 Pomo(piathvs, F. Dixon, Geol. Sussex, 1850, p. 367. 

 ArcliKogadus, W. von der Marck, Pal«ontogr., vol. xv, 1868, p. 291. 

 Phylactocejihalus, J. W. Davis, Trans. Eoy. Diil)lin Soc. [2], vol. iii, 1887, p. 605. 



