358 
ACT 1X 0 i’ TE R Y GII. 
and the hinder margin is not serrated. That the scales do not 
pertain to Lepirlotus is shown not only by their form, but also by 
the non-production of the angles of the overlapped anterior border. 
Form. Lor. Turonian : Kent and Surrey. 
P. 4705. Group of associated scales, to be regarded as the type 
specimen ; Lower Chalk, Burham, Kent. 
Enniskillen Coll. 
P. 1106. Two smaller groups of imperfect scales, one labelled by 
Agassiz ; Barham. Egerton Coll. 
P. 6526. Group of six associated scales, three figured in Proc. Geol. 
Assoc, vol. x. pi. i. fig. 2; Blue Bell TIill, Burham. 
Presented by S. J. Hawkins y Esq., 1891. 
P. 7567. Abraded scale ; Lower Chalk, Dorking, Surrey. 
Purchased. 
An imperfect fish much resembling Neorhombolepis , but differing 
in its more powerful dentition and the subdivision of the gular 
plate into four pieces, is described as follows :— 
Otomitla speciosa, J. Felix, Palseontogr. vol. xxxvii. (1891), p. 189, 
pi. xxix. fig. 3, pi. xxx. figs. 3-5.—Keocomian ; Cerro 
de la Yirgen, Tlaxiaco, Oaxaca, Mexico. [Head with 
scattered scales and vertebrae; J. Felix Collection, 
Leipzig.] 
Genus LOPHIOSTOMUS, Eg erton. 
[Figs. & Descript. Brit. Organic Remains, dec. vi. (Mem. 
Geol. Sure. 1852), no. 10.] 
An imperfectly known genus with relatively large head, which 
appears to have been much depressed. External head-bones and 
the opercular bones robust, more or less ornamented with tubercles 
and rugae of enamel; the roof of the cranium raised into a promi¬ 
nent boss on each side immediately behind the orbit; jaws 
relatively very large, the maxilla with a straight or slightly 
concave dentigerous border, and the premaxillae fused with the 
ethmoid ; teeth in regular series, large and hollow on the margin 
of the jaw, minute on the inner bones, and those of the dentary 
larger than those of the maxilla; suboperculum nearly half as 
large as the operculum, which is quadrangular but truncated at the 
postero-superior angle ; gular plate very large. [Axial skeleton of 
trunk not certainly known .1 Fin-rays robust, externally ornamented; 
paired fins without fulcra, the pelvic pair relatively small; [median 
