HOPLOPTERYX. 13 



Type specimen obtained by Joseph Wood for Frederick Harford, Es([., who pre- 

 pared it. 



3. Berycopsis pulchella (Dixon). 



1850. Stetiostoma yiiJchella, F. Dix.m, Gfol. Sussex, p. 373, pi. xxxvi, fig. 2. 

 1888. Stetiostoma pvlchella, A. S. Woodward, Proc. Geol. Assoc, vol. x, p. 329. 

 1901. Berycopsis, sp., A. S. "Woodward, Catal. P'oss. Fishes B. M., pt. iv, p. 425. 



Tj/pc — Imperfect fish ; British Mnsenm. 



Specific Characters. — An imperfectly known very small species, resembling 

 B. major in the form of the antorbital and scales, but apparently with rather more 

 than 20 scales in a transverse series on the abdominal region, and snpramaxilla 

 feebly ornamented. 



Description, of Specimen. — The nnique type specimen of this species represents 

 a fish only abont 8'5 cm. in length, and is very nnsatisfactorily fignred l^y Dixon, 

 op. cit. The orbit is nnusnally large and snrronnded by the characteristic circum- 

 orbital plates, of which the antorbital is seen to resemble that of B. major in form 

 and proportions. The hinder expansion of the maxilla is qnite smooth ; while the 

 rather low, large snpramaxilla is only faintly rngose, and an impression on the 

 chalk seems to indicate that it was not trnncated but tapering behind. A fragment 

 of the outer face of the operculum displays the ridged ornament ; and scales are 

 observed to extend over both this bone and the cheek. Traces of the base of the 

 dorsal and caudal fins are seen. Most of the scales are preserved in undisturbed 

 series, and their pectinations terminate in a rather conspicuously serrated hinder 

 border. 



The relatively large size of the orljit, and the prominence of the scale-ornament 

 are characters suggesting the immaturity of the fish noAV described. 



Horizon and Locaiiti/.- — -Probably zone of Holaster subglohosus : Steyning, 

 Sussex. 



An undetermined species of Bemjcopsis from the Grey Chalk (zone of Holaster 

 suJifjlohosus) of Dover is also indicated by part of a small trunk in the British 

 Museum (no. 490()2). 



Fa mil 1 1 Bktjyctd.t:. 



Genus HOPLOPTERYX, Agassiz. 



HopJopteryx, L. Agassiz, Poiss. Foss., vol. iv, 1838, p. 4. 



Generic CJiararters. — Tnmk much deepened and laterally C()mj)ressed, with 

 lower face of abdominal regicMi flattened. Frontal region of skull deeply ridged 



