BERTCIDJE. 
407 
The pelvic fins being incompletely known, the systematic position 
of this fish is somewhat uncertain. The arrangement of the median 
fins exhibits considerable resemblance to that observed in the 
existing Teuthis. 
Dinopteryx spinosus (Davis). 
1887. Iloplopteryx spinosus, J. W. Davis, Trans. Roy. Dublin Soc. 
[2] vol. iii. p. 516, pi. xxviii. fig. 1. 
Type. Imperfect fish ; British Museum. 
The type species, attaining a length of about 0’15. Length of 
head with opercular apparatus exceeding the maximum depth of tho 
trunk and contained about one and a quarter times in the length 
from the pectoral arch to the base of the caudal fin. The stout fin- 
spines ornamented with conspicuous longitudinal ridges. Dorsal 
fin arising over the hinder border of the operculum, its anterior 
portion of 14 spines three times as much extended as its hinder 
portion of about 9 articulated and divided rays ; the foremost five 
or six spines slightly bent, the others quite straight. Anal fin 
arising opposite the last dorsal spine, its anterior portion of 7 spines 
as much extended as its hinder portion of about 9 articulated and 
divided rays ; the foremost anal spines rather shorter and more 
curved than the following spines. Caudal pedicle very short and 
slender. 
Form, <$/■ Loc. Upper Cretaceous : Sahel Alma, Mt. Lebanon. 
P- 4761. Type specimen described and figured by Davis, loc. cit. 
p. 516, pi. xxviii. fig. 1. Lewis Coll. 
48128. Second specimen noticed by Davis, loc. cit. p. 518. The 
characteristic toothless maxilla is conspicuous, and there 
are traces of minute teeth in the mandible. The large 
pelvic fin-spine is shown in impression ; and some of the 
scales are well preserved. Lewis Coll. 
46536. Another characteristic specimen, showing impression of 
ridged pelvic fin-spine and traces of the succeeding articu- 
lated rays. Lewis CoU - 
Genus HOMONOTUS, Dixon. 
[Geol. Sussex, 1850, p. 372.] 
An imperfectly known genus, with the trunk much deepened and 
laterally compressed. Dorsal fin much extended, its anterior 
portion comprising at least 12 long and slender spines, which are 
