EUGNATHIDJE. 
359 
fins unknown]. Scales thick, with a narrow overlapped border not 
produced at the angles, and the peg-and-socket articulation feeble 
or wanting; superficial ganoine more or less striated or pitted; 
numerous series of narrow ventral scales. 
One group of remains mentioned below, and another similarly 
fragmentary group in the Brighton Museum, exhibit ring-vertebrae 
which probably belong to this fish. 
Lophiostomus dixoni, Egerton. 
1852. Lophiostomus dixoni , Sir P. Egerton, loc. cit. no. 10, pis. x., x*. 
1888. Lophiostomus dixoni, A. S. Woodward, Proc. Geol. Assoc, vol. x. 
p. 303. 
Type. Head with part of abdominal region ; British Museum. 
The type species, with head attaining a length of 0'06. External 
bones and fin-rays ornamented with closely-arranged short rugae 
and tubercles of ganoine. Maximum width of cranial roof exceed¬ 
ing two-thirds of its length; the paired frontal prominences narrow 
and laterally compressed but much elevated, the height of each 
exceeding half the distance between them. Marginal teeth in one 
regular series, some exhibiting feeble vertical wrinkles in their 
apical portion ; mandibular ramus about three and a half times as 
long as its maximum depth. Branchiostegal rays about 12 in 
number, nearly all ornamented; gular plate as long as the denti¬ 
gerous portion of the mandible, and at least two-thirds as broad as 
long. Ornament of tin-rays consisting chiefly of oblique wrinkles. 
Hinder border of scales with coarse, long, acuminate pectinations, 
continued on the outer face of the principal scales as oblique 
wrinkles or elongated pits. 
Form. Sf’ Loc. Senonian ; Sussex and Kent. 
23023. The type specimen, described and figured by Egerton, loc. 
cit. ; Alfriston, Sussex. The comparatively smooth plate 
named “ scapula,” is evidently one of the postclavicular 
series. Presented by Capt. J. L. BecJcford , R.N. 
P. 1116. Scales and an associated bone-fragment; Alfriston. 
Egerton Coll. 
P. 5409. Portion of fin-ray and two imperfect scales ; Sussex. 
Presented by P. E. Coornbe, Esq., 1888. 
39121. Group of scales and remains of fin-rays ; Maidstone. 
Bowerbanlc Coll. 
P. 4263. Scales apparently with imperfect ring-vertebrae; Lewes. 
Enniskillen Coll. 
