236 
ACTrNTOPTEEYGII. 
Paired fins small; one dorsal fin-ray 
mucli 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 fins large; 
dorsal and anal fins short-based and 
acuminate ; caudal fin with long 
slender lobes . 
As Oinsthopte7'yXj but teeth rather 
large and in spaced series. 
C. 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. 
Premaxillae and mandible scarcely ex¬ 
tending further forwards than the 
ethmoid... 
Premaxillae and mandible produced into 
a long rostrum... . 
Nematonotus (p. 249). 
Micrococlia (p. 252). 
Opisthopteryx (p. 253). 
Scopeloides (p. 254). 
Pat'ascopelus (p. 256). 
Anapterus (p. 257). 
Apateodiis (p. 258). 
RJiinelhis (p. 265). 
Genus SARDINIOIDES, W. von der March. 
[Zeitschr. deutsch. geol. Ges. vol. x. 1858, p. 245.] 
Syn. Dermatoptyclms, W. von der March, Palaeontogr. vol. xv. 1868, 
p. 287. 
Head large, and the maximum depth of the trunh at the origin 
of the dorsal fin. Mandibular suspensorium nearly vertical; jaws 
moderately stout, and maxilla expanded behind; teeth very minute; 
cheeh scaly. Branchiostegal rays about 9 in number. Vertebrae 
between 30 and 40 in number, about half being caudal; the centra 
longitudinally striated and not longer than deep; ribs delicate. No 
fin-rays elongated, but two or three in front of the median fins 
undivided and spinous. Pectoral fins very delicate and small, well 
above the ventral border; pelvic fins well developed, with about 
7 rays, opposed to the dorsal fin, which is nearly median a'nd 
comprises from 10 to 18 rays; anal fin behind the dorsal, at least 
