292 REPORT OF NEW JERSEY STATE MUSEUM. 
Genus ALBACcoRA Jordan. 
The Great Tunnies. 
Albacora thynnus (Linnezus). 
Horse Mackerel. 
Flead 312 ; depth 344; D: XV—11\ 12, 8; A. 11, Il, 7; depthya: 
head 1% in its length; width of head 134; mandible 2% ; first 
dorsal spine 15%; first branched dorsal ray 34%; first branched 
anal ray 314; upper caudal lobe 134; pectoral 124; ventral 2 7/,; 
greatest width of caudal peduncle 5%2; snout 3% in head 
measured from tip of upper jaw; eye 644; maxillary 234; inter- 
orbital space 3. Body fusiform, robust, especially anteriorly. 
Caudal peduncle greatly depressed, slender, and with a broad 
keel on each side. A small keel above and below this at base of 
each caudal lobe. Head large, broadly convex above, and more 
or less conic. Snout a little broader than long. Eye with slight 
adipose eyelid so that its exposure is deeper than long, and near 
first third of head. Mouth curved, mandible projecting a little, 
and maxillary reaching first 34 of eye, its distal expansion about 
equal to diameter of large pupil. A series of small conic teeth 
in jaws, best developed along sides of mandible. Teeth on 
vomer and palatines very minute, scarcely evident. Tongue with 
a keel on each side, rounded and free in front. Anterior nostril 
near last third in length of snout. Posterior nostril a vertical 
slit near front of eye, and about equal to vertical diameter of 
pupil. Interorbital space evenly convex. Gill-rakers 10+27, 
compressed, longest about half of filaments, which are equal to 
snout. Pseudobranchize about equal to horizontal eye. Scales 
on pectoral region forming a corselet, a little large just above 
basal region of pectoral, and very narrowly imbricated. Corse- 
let extending a little beyond tip of pectoral. Very minute scales 
in lateral line to caudal peduncle keel, and others out on base 
of caudal. Origin of spinous dorsal midway between that of 
rayed dorsal and tip of mandible, graduated down from first or 
