BBRYCOPSIH. 1 1 



due to the effect of some solvent on theii" outer face during fossilisation. Xo 

 thickened or specially enlarged scales liave been observed ; and there are probably 

 about 80 scales in each transverse series in the abdominal region. Their extension 

 over the operculum and cheek has already been described. Small scales cover the 

 muscular portion over the occipital and parietal region of the skull. There are 

 also traces of them enveloping the base of the rays of the dorsal fin in the original 

 of PI. T, fig. 1, and in B. M. no. P. 05:3-5. The lateral line is distinguishal)le, Imt 

 only feebly marked. 



Hori-:niis and L()calltk\s. — Zone of Holaster snhijJohosiifi : Clayton, Sussex; 

 Burhani, Kent. Probably zone of Rhijnchondla Ciunori : Lewes, Sussex. Zone of 

 Holader i)lanu>i or Terehratnliiia fjracUis : Cuxton, Kent; Leaves. 



2. Berycopsis major, sp. nov. Plate II, fig. 2. 



Tijpe. — Imperfect head and trunk ; British Museum. 



Specijic Characters. — An hnperfectly known species attaining a length of about 

 30 cm. Ornament of head and opercular bones more prominent than in the type 

 species, extending over the hinder expanded "portion of the frontals and the 

 thickened front l)order of the supraoccipital crest. Antorbital cheek-plate not 

 deeper than broad and less deep than the orbit. Scales with a regular ornament 

 of delicate pectinations at the hinder border, which is gently and regularly curved ; 

 much larger and fewer than in the type species, there being less than 20 scales in 

 each transverse series in the abdominal region. 



Description of Specimen. — The unique specimen of this species is shown of the 

 natural size in PI. II, figs. 2, 2 a. It has been much broken, 1jut displays many of 

 the essential characters of the fish. The general proportions of the cranium do 

 not differ much from those of the type species, l)ut it is much more extensively 

 ornamented and the median ethmoid is less exposed. The large triangular supra- 

 occipital crest is only strengthened on its side by a slight ridge ; but its anterior 

 margin is thickened and was probal)ly exposed, l)eing marked with a fine longi- 

 tudinal ridged ornament. The frontal region (fr.) is produced on each side into an 

 overhanging supraorbital flange ; and the rugose ornamentation is not confined to 

 this, but extends in a radiating manner over nearly the whole of the hinder half of 

 each frontal bone. The actual hinder limit of the frontals seems to be a straight, 

 transverse line ; while the small ornamented triangular area beyond this at each 

 postero-lateral angle is doubtless to be regarded as belonging to the parietal (pa.). 

 The small mesethmoid (fig. 2 a, <'tli.) has the same form as in B. clegans, but is 

 more extensively covered by the frontals than in the latter species. The large, 

 deep, antero-posteriorly compressed prefrontal or ectethmoid {prf.) is well shown, 

 and is clearly articulated with the enlarged foremost plate of the circumorbital 



