EUGXATHIDiE. 
303 
P. 508. Imperfect squamation and other fragments, specifically 
indeterminable, but marked as the type specimen of 
Eugnathus fasciculatus, Agassiz, Poiss. Poss. vol. ii. pt. ii. 
1844, p. 105 (name only); Upper Lias, Whitby. 
Egerton Coll. 
P. 873, P. 4468. Small fish in counterpart, wanting the bead, and 
labelled Eugnathus fasciculatus by Agassiz. The pectoral 
fin is relatively large, with about 15 rays; the dorsal fin 
arises opposite a point midway between the pectoral and 
anal fins ; the latter is only about half as large as the 
dorsal. Egerton Sf Enniskillen Colls. 
28855a. Fragmentary small trunk in counterpart; Upper Lias, 
Cheltenham. Purchased, 1854. 
32450. Head and greater portion of trunk of a small fish, with 
highly ornamented scales which are serrated even in the 
hinder portion of the caudal region ; Upper Lias, Caen, 
Normandy. The mandibular teeth are only moderately 
robust, and the operculum is considerably deeper than 
broad. Tesson Coll. 
P. 7563. Portion of abdominal region displaying some of the 
anterior flank-scales ; Lower Lias, Lyme Regis. 
Presented by Edward Charlesworth, Esq. 
P. 510. Imperfect left maxilla, shown from the outer aspect of the 
natural size in PI. IY. fig. 2, intended by Agassiz to be 
the type specimen of his undescribed species Eugnathus 
tenuidens (Poiss. Foss. vol. ii. pt. ii. 1844, p. 105) ; Lower 
Lias, Street, Somersetshire. Egerton Coll. 
P. 517. Imperfect fish about 0-15 in total length, intended by 
Agassiz to be the type specimen of his undescribed species 
Pholidophorus leptocephalus (Poiss. Foss. vol. ii. pt. i. 
1844, p. 288) ; Lower Lias, Street. The cranium is 
wanting, but the right opercular and facial bones are 
exhibited in impression. The characteristic maxilla and 
its dentition are distinctly observable; while the oper¬ 
culum is shown to be about as deep as broad. The fins 
are represented only by insignificant fragments, but the 
dorsal is proved to have been relatively large. The 
principal flank-scales are very delicately crimped and 
serrated on their hinder margin in the abdominal region, 
