342 
ACIINOPTERYGII. 
Caturus latipennis (Egerton). 
1844. Pachycormus latipennis, L. Agassiz, Poiss. Foss. vol. ii. pt. ii. 
p. 114 (undefined). 
1858. Pachycormus latipennis, Sir P. Egerton, Figs. & Descript. Brit. 
Organic Remains, dec. ix. (Mem. Greol. Surv.), no. 3, pi. iii. 
Type. Head, with pectoral fin and scales ; British Museum. 
An imperfectly definable species closely similar to C. heterurus . 
External head-bones and opercular bones ornamented only in part 
with feeble rugae and tuberculations, the supratemporals and post¬ 
temporals closely tuberculated ; maxillary teeth small, slender, an d 
in close series, and those of the dentary hone large, stout, well¬ 
spaced. Hypocentra and pleurocentra distinct, robust. Scales of 
moderate size, smooth. 
The anterior pectoral fin-rays of this species seem to be some¬ 
what broader and more arcuated than in C. heterurus. 
Form. 6f Loc. Lower Lias : Dorsetshire. 
P. 568. The type specimen, described and figured by Egerton, 
loc. cit.; Lyme Regis. Enniskillen Coll. 
38527. Similar specimen exposed from the left side; Lyme Regis. 
The pectoral fin is well-preserved, but there are only 
slight traces of slender fulcra. Purchased, 1864. 
Caturus agassizi (Egerton). 
1858. Endactis agassizi, Sir P. Egerton, Figs. & Descript. Brit. Organic 
Remains, dec. ix. (Mem. Geol. Surv.), no. 4, pi. iv. 
Type. Fragmentary head and trunk; British Museum. 
The type species of the so-called genus Endactis, attaining a length 
of about 0*3. The proportions being apparently similar to those of 
C. heterurus, it remains doubtful whether the fish is not merely the 
young of the latter species ; but in the specimens mentioned below 
the scales seem to be relatively smaller and more conspicuously 
crimped, while ossifications in the notochordal sheath are very 
feeble or absent. The crimpings on the scales sometimes radiate 
more or less. 
Form. Sf Loc. Lower Lias : Dorsetshire. 
P. 567. The type specimen, very fragmentary, showing the greater 
part of the squamation of the right side from within ; 
Lyme Regis, There are distinct indications of large 
