CATALOG OF FOSSIL FISHES IN THE CARNEGIE MUSEUM 389 
Type.—Imperfect fish; Paris Museum of Natural History. 
Two examples of this rare and interesting species are recorded as belonging to 
the British Museum of Natural History, and one each is to be found in the Har- 
vard and Pittsburgh Museums, in this country. That belonging to the latter 
institution is a fair specimen, showing the characteristic squamation, and cata- 
loged under the number 4215. It is shown of twice the natural size in the accom- 
panying plate. 
Suborder PEDICULATI. 
This is a small, natural group, connected with the Acanthopterygi jugulares 
through the Batrachide, in which the elongate pterygials foreshadow the kind of 
“arm” or pseudobrachium which generally characterizes these highly aberrant 
Fishes. Dr. Theodore Gill has recently contributed a valuable paper on this 
group. 
Family ANTENNARIIDA. 
“Mouth large, vertical or very oblique, turned upwards, with cardiform teeth. 
Gill-opening in or behind lower axil of pectoral; no pseudobranchix. Pectoral 
fin forming an elbow-like angle, with three pterygials. Ventral with four or five 
rays. Spinous dorsal present. Skin naked or spinulose.” 
According to Dr. Boulenger, from whom we have taken the above family 
diagnosis, this group comprises about forty recent species, distributed among five 
genera: Plerophryne, Antennarius, Brachionichthys, Saccarius, and Chaunax, “The 
species of Antennarius,” says the same author, “live mostly in coral groves, where 
they lie in wait for prey, well-concealed by the protective coloration and the har- 
monizing aspect of their integument and appendages. To this genus also belongs 
the ‘Marbled Angler’ (A. marmoratus), carried about in mid-ocean among the 
Sargassum weed, to rest on which, from its peculiar arm-like pectoral fins, it is 
especially fitted; there it makes its wonderful nest of silk-like fibres probably 
secreted by the parent as in the Sticklebacks, with large bundles of eggs hanging 
like grape clusters.” 
Genus HistionotopHorus Eastman. 
(Syn. Histiocephalus Zigno.) 
This extinct genus, known only by the typical species, is one of the rarest 
of all the components of the Eocene fish-fauna of Monte Bolca. Its systematic 
relations have been discussed by Dr. Theodore Gill and the present writer, and 
attention has been called to it as a remarkable instance of a form of fish-life appear- 
ing suddenly in the Hocene, already highly modified, without any known prede- 
cessors nor any that can be plausibly conjectured, but which persists after its first 
