84 
ACTINOPTERYGII. 
Lepidotus elvensis (Blainville). 
1818. Cyprinus elvensis , H. D. de Blainville, Nouv. Diet. d’Hist. Nat. 
vol. xxvii. p. 394. 
1830. “ Fossil fish,” G. Baker, Hist. Northampton, vol. i. p. 440, with 
plate. 
1832. Lepidotes gigas, L. Agassiz, Neues Jahrb. p. 145. 
1833-37. Lepidotus gigcis, L. Agassiz, Poiss. Foss. vol. ii. pt. i. pp. 8,235, 
pis. xxviii., xxix. [Head, etc.; Stuttgart Museum.] 
1843. Lepidotus elvensis, F. A. Quenstedt, Flozgeb. Wiirttemb. p. 228. 
1847. Lepidotus elvensis, F. A. Quenstedt, Ueber Lepidotus im Lias e, 
with plates. 
1886. Lepidotus gigas, B. Thompson, Journ. Northampton. Nat. Hist. 
Soc. vol. iv. p. 27, with plate. 
Type. Nearly complete fish; Paris Museum of Natural History. 
The type species, attaining a length of about 0*75. Head with 
opercular apparatus occupying about one-quarter of the total length ; 
maximum depth of trunk contained not much more than three times 
in the total length. External bones nearly smooth, but in part 
with sparsely-arranged coarse tuberculations ; parietal bones much 
less than half as long as the frontals, which are nearly three times 
as long as their maximum width, narrow in front, and united by a 
slightly wavy median suture; mandibular symphysis comparatively 
narrow. Marginal teeth acuminate, not less than three times as 
deep as broad. Operculum two-thirds as broad as deep, and its 
maximum breadth equalling somewhat less than one-half the length 
of the head. Fin-fulcra moderately developed; dorsal and anal 
fins deeper than long. Scales smooth, the principal flank-scales 
slightly deeper than broad, with a few coarse serrations upon the 
inferior half of the hinder border. 
Form. Sf Loe. Upper Lias: Bavaria, Wurtemberg, and N. France ; 
Somersetshire and Northamptonshire, % 
P. 7406. Fish, wanting all the fins and the external surface of most 
of the scales and head-bones; probably from Wurtemberg. 
The cranial roof and all the facial bones of the right side, 
except those bordering the mouth, are well displayed ; 
and there are recognizable remains of the opercular 
apparatus and pectoral arch. 
19662. Remains of head and trunk, displaying the circumorbitals, 
suborbitals, preoperculum, and interoperculum of the right 
side, with portions of the anal and caudal fins ; Boll, 
Wiirtemberg. Purchased , 1845. 
P. 7407. Imperfectly preserved fish, wanting the anterior portion 
of the head and all the fins, except fragments of the 
