SEMIOXOTIDJS. 
115 
2401. Hinder portion of head, with some anterior scales and 
ring-vertebrse; Sussex. The supratemporal plates are 
not in symmetrical pairs, hut three on one side of the 
median line and two on the other. The operculum is 
coarsely tuberculated and the ascending process of the 
suboperculum is long and slender; hut the anterior 
margin of the former is strongly sinuous. Mantell Coll. 
P. 6566. Parasphenoid bone, imperfect at each extremity, hut 
showing the ascending lateral processes with superior 
bifurcation ; Hastings. Beckles Coll. 
2399. Left frontal ascribed by Agassiz {tom. cit. p. 264, pi. xxx. b. 
fig. 2) to L. mantelli ; Tilgate Forest. Mantell Coll. 
2528. Eight frontal ascribed by Agassiz {tom. cit. p. 264, pi. xxx. b. 
fig. 3) to the so-called L.fittoni ; Tilgate Forest. 
Mantell Coll. 
P. 7416-17. Left frontal and portion of right frontal; Hastings. 
Dawson Coll. 
2217. Imperfect left operculum ; Tilgate Forest. Mantell Coll. 
2219. Imperfect right suboperculum; Tilgate Forest. 
Mantell Coll. 
2209. Eight preoperculum, inner aspect; Tilgate Forest. 
Mantell Coll. 
P.7418. Eight preoperculum; Tilgate Forest. Enniskillen Coll. 
2711. Ceratohyal; Tilgate Forest. Mantell Coll. 
2326. Three portions of dentition figured by Agassiz, tom. cit. 
pi. xxx. a. figs. 4, 5, pi. xxx. c. figs. 2, 3; Tilgate Forest. 
The first figure represents the greater part of the right 
mandibular dentition with the comparatively small series 
of teeth on the dentary hone ; the second specimen is the 
middle portion of a vomer ; and the third specimen, shown 
in the two last-named figures, is the pterygo-palatine 
dentition apparently of the left side. Mantell Coll. 
28412. Associated vomer, left pterygo-palatine, and right mandibular 
ramus of a large individual; Sussex. The vomer shows 
the characteristically-arranged five posterior teeth, with 
the smaller anterior teeth iu four very irregular longitu¬ 
dinal series; the pterygo-palatine has a minute fourth 
outer series of teeth ; the bases of six small teeth of the 
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