236 
ACTINOPTERTGII. 
Paired fins small ; one dorsal fin-ray 
mucfi elongated and closely articu- 
lated ; anal fin -very small ; scales 
cycloid 
B. Normal forms with dorsal fin not 
completely in advance of anal fin. 
Teeth minute ; pectoral fins small ; 
dorsal and anal fins extended .... 
Teeth minute ; pectoral tins large ; 
dorsal and anal fins short-based and 
acuminate ; caudal fin with long 
slender lobes 
As Opisthopteryx, but teeth rather 
large and in spaced series 
! ■ Much elongated forms with anal fin 
completely behind dorsal fin. 
Pectoral fins large ; pelvic fins small 
and far forwards ; dorsal fin short- 
based and median ; anal fin some- 
what extended. 
Paired fins small ; dorsal fin short- 
based and remote ; anal fin much 
extended 
II. Premaxilla very stout. 
Premaxillas and mandible scarcely ex- 
tending further forwards than the 
ethmoid 
Premaxill® and mandible produced into 
a long rostrum 
Nematonotus (P- 
Microcoeliu (p. 
») ')'i ) 
Opisthopteryx (p- 1 
Scopeloides (P- 2-3-H- 
Parascopelus (p* 
Anapterus (p- ' 
Apateodus (p- - 58 ' 1 ' 
Rltinellus (p- 2651- 
Genus SARDINIOIDES, W. von der March. 
[Zeitschr. deutsch. geol. Ges. vol. x. 1858, p. 215.] 
6 , 1868 . 
byn. Dermatoptychus, W. von der March, Palaeontogr. vol. 
p. 287. 
Head large, and the maximum depth of the trunh at 1^ .^ g 
of the dorsal fin. Mandibular suspensorium nearly vertica ’ 
moderately stout, and maxilla expanded behind ; teeth verj m 
cheek scaly. Branchiostegal rays about 9 in number. er ^, tra 
between 30 and 40 in number, about half being caudal ; the c ' ^ 
longitudinally Btriated and not longer than deep; ribs delica e 
fin-rays elongated, but two or three in front of the 1J ^, e |[ 
undivided and spinous. Pectoral fins very delicate and snia 
above the ventral border; pelvic fins well developed, wit 
7 rays, opposed to the dorsal fin,- which is nearly roe >- ^ 
comprises from 10 to 18 rays; anal fin behind the dorsal, at 
