284 
ACXINOPTEEYGII. 
Type. Imperfect fish ; Academy of Munster. 
The type species of Megistopus, attaining a length of about 0*12, 
and of slender proportions. Length of head with opercular 
apparatus equalling twice the maximum depth of the trunk, and 
slightly exceeding one third of its length from the pectoral arch to 
the base of the caudal fin. Pectoral fins apparently as in the type 
species; but the pelvic fins more remote, with about 13 rays, of 
which the longest scarcely reaches beyond the origin of the anal fin 
when adpressed to the trunk. 
Form. Log. Upper Cretaceous : Baumberg, 'Westphalia. 
Not represented in the Collection. 
Genus TEILEPHOLIS, W. von der Marck. 
[Palseontogr. vol. xv. 1868, p. 276.] 
Head relatively large and jaws apparently toothless. Yertebr£e 
between 40 and 50 in number, about half being caudal. Fin-rays 
mostly divided as well as articulated distally. Pectoral fins arising 
near the ventral border, delicate but larger than the pelvic pair, 
which comprise about 8 rays and are supported by much expanded 
pelvic bones; dorsal fin arising opposite or somewhat in advance of 
the pelvic pair, and occupying less than half the back; caudal fin 
slightly forked. The dorsal region protected with a covering of 
small, thin, rounded or polygonal dermal scutes, each bearing a 
median tubercle. 
One of the original specimens of the type species in the Academy 
of Miinster (noticed by W. von der Marck, Palseontogr. vol. xxxi. 
p. 248) clearly exhibits the ujpper jaw. The slender toothless 
premaxilla is shown to form the upper border of the mouth, 
excluding the maxilla, which has a triangular expansion behind. 
Telepholis acrocephalus, W. von der Marck. 
1868. Telepholis acrocephalus, W. von der Marck, Palseontogr. vol. xv. 
p. 277, pi. xliii. figs. 6, 7. 
1873. Telepholis acrocephalus^ W. von der Marck, ihid. vol. xxii. p. 57, 
pi. ii. fig. 2 a. 
1885. Telepholis acrocephalus^ W. von der Marck, ihid. vol. xxxi. p. 248. 
Type. Imperfect fish; Academy of Munster. 
The type species, attaining a length of about 0-18. Length of 
head with opercular apparatus somewhat less than twice as great as 
the maximum depth of the trunk, which is contained between four 
and five times in its length from the pectoral arch to the base of 
