ETJGSTATHIDJE. 
299 
Eugnathns altus, sp. nov. 
[Plate VI. fig. 2.] 
Type. Imperfect fish ; British Museum. 
A species of moderate size, similar in proportions to E. serratus. 
All the marginal teeth slender and in close series, hut those of the 
dentary much exceeding those of the maxilla in size. Scales 
relatively smaller than in any of the foregoing species. 
Form. Sf Loc. Lower Lias: Dorsetshire. 
P. 2029. The type specimen shown of two-thirds the natural size 
in PI. VI. fig. 2; Lyme Regis. The bones of the head 
are displaced and scattered, but some are well shown. 
The dentary (d .), maxilla (mx .), and premaxilla (pmx .) 
exhibit long, slender teeth ; while portions of the inner 
bones of the mouth are covered with granular teeth. The 
form of the hyomandibular (Jim.) is also well shown, 
and the suboperculum ( s.op .) is seen to bear an ascending 
process at its antero-superior angle. Behind the opercular 
apparatus the clavicle (cl.) is displayed, showing vertical 
ribbing on the outer face; but only fragments of the 
pectoral, pelvic, dorsal, and caudal fins are preserved, 
while the anal fin is wanting. Some of the anterior flank- 
scales are deeper than broad, and the ornament does not 
entirely disappear until the series at the hinder end of 
the dorsal fin. Egerton Coll. 
Eugnathus hastingsise (Agassiz). 
[Plate VII. fig. 1.] 
1843-44. Pholidophoj'us hasting sice, L. Agassiz, Poiss. Foss. vol. ii. 
pt. i. p. 284, pi. xlii a. fig. 1. 
Type. Imperfect fish ; British Museum. 
A very small species, attaining a length of about 0*1. Length of 
head with opercular apparatus equalling about one-quarter, and 
maximum depth of trunk scarcely more than one-sixth of the total 
length of the fish; maximum width of caudal pedicle equalling 
half the maximum depth of the trunk. Head elongated, and 
the external bones almost or quite smooth; mandibular teeth few 
and stout, maxillary teeth closely arranged and slender ; operculum 
very slightly broader than deep. Fins as in the type species. 
Scales very feebly ornamented in the anterior abdominal region, 
smooth and not serrated in the caudal region. 
Form. Sf Loc. Lower Lias ; Leicestershire and Warwickshire. 
