CHIEOTHRICID^. 
279 
are distinctly supported by broad transverse processes. 
Some of the characteristic long and slender intermuscular 
bones are seen beneath the dorsal fin. All the fins are 
imperfectly preserved. The squamation is shown to 
extend over the cranium. Egerton Coll. 
P. 4322. Imperfect vertically crushed fish, showing the ribs 
supported by transverse processes and the squamation 
extending over the head ; Mombach. Enniskillen Coll. 
48041 X. Fragmentary distorted specimen; Mombach. 
John Broivn Coll. 
Presented hy Sir Richard Owen, K.C.B., 1860. 
P. 1820 a. Crushed remains of head and anterior vertebrae, labelled 
Cohitis longiceps by Agassiz; Mombach. The com¬ 
paratively short mandible is shown articulating with the 
quadrate, and the dentary displays the usual great 
ascending process. Some of the upper branchiostegal 
rays are preserved, and the suboperculum exhibits five 
clefts. The anterior vertebrae are provided with transverse 
processes. Egerton Coll. 
P. 1820 h. Another fragmentary specimen ; Mombach. 
Egerton Coll. 
P. 3858, P. 3869. Four fragmentary specimens, displaying several 
characteristic features in the osteology of the fish; 
ATombach. Enniskillen Coll. 
Family CHIROTHHICID^. 
Trunk fusiform or elongated. Mandibular suspensorium inclined 
forwards, and gape of mouth small; premaxilla delicate and styli- 
form, completely excluding the maxilla from the upper border of 
the mouth; jaws with feeble dentition or toothless. Opercular 
apparatus complete, with a few large branchiostegal rays. Ver¬ 
tebral centra with robust transverse processes in the abdominal 
region ; ribs short and slender; expanded haemal arches scarcely 
fused at the base of the tail. Intermuscular bones present. Paired 
fins much enlarged, and the pelvic pair far forwards; a single large 
dorsal fin in the anterior half of the trunk, with stont triangular 
supports ; anal fin small and remote; caudal fin separate. 
An extinct family of pelagic fishes. 
