SEMIOXOTIDiE. 
161 
P. 1594. A small fish wanting the caudal region, showing the 
position of the pelvic fins ; Dumbleton. Egerton Coll . 
P. 3624. Two specimens of the abdominal region, one also ex¬ 
hibiting the opercular apparatus and pectoral fin ; Dum¬ 
bleton. Enniskillen Coll. 
P. 7039. Fragment of abdominal squamation ; Dumbleton. 
Purchased , 1894. 
Tetragonolepis oldhami, Egerton. 
1878. Tetragonolepis oldhami, Sir P. Egerton, Palaeont. Indica, [4] 
vol. i. pt. ii. p. 3, pi. ii. fig. 1. 
Type. Fish wanting head and caudal region; Indian Museum. 
Calcutta. 
A species attaining a length of about 015, with trunk apparently 
less deepened than in the type; the greatest depth of that portion 
of the trunk below the vertebral axis equalling about twice that of 
the portion above the axis. Cranial roof closely tuberculated, facial 
and opercular bones apparently smooth. Ventral ridge-scales 
tuberculated and sharply serrated. 
Form, Loc. Lower Jurassic (Kota Group) : Deccan, India. 
Not represented in the Collection. 
Tetragonolepis drosera, Egerton. 
1852. Pleurolepis, spF. A. Quenstedt, Handb. Petrefakt. p. 215. 
1853. Tetragonolepis droserus , Sir P. Egerton, Quart. Journ. Geol. Soc. 
vol. ix. p. 278, pi. xi. fig. 4. 
1858. Tetragonolepis cinctus, F. A. Quenstedt, Der Jura, p. 230, 
pi. xxix. figs. 6, 7. [Nearly complete fish ; Tubingen University 
Museum.] 
1860. FLomceolenis drosera. A. Wagner, Gelehrte Anzeig - . k. bay. Akad. 
Wiss. vol. 1. p. 97. 
Type. Imperfect fish ; British Museum. 
A large species, attaining a length of about 0*3, and somewhat 
more elongated than the type. Head with opercular apparatus 
occupying about one-quarter of the total length; the external 
bones closely granulated. Scales ornamented with numerous gra¬ 
nulations, rarely fused into short rugae; the hinder border not 
serrated. 
This species is regarded by Wagner as the type of a distinct 
genus, Homceolepis , said to be separated from Tetragonolepis by the 
much less protuberant character of the ventral region, the relatively 
PART III. M 
