POROGADUS LONGICEPS. 153 
Porogadus longiceps sp. n. 
Plate F, fig. 2; Plate LXXVTI. fig. 1, Lat, Syst. 
Br. r. 8; D. 183-184; A. 149-152; V. 2; P. 20; C. 6. 
The specimen described has a length of eighteen inches. Compressed, 
elongate, very slender in the caudal portion, depth three fourths of the 
head. Head one sixth of the total length; parietal region flattened, with 
a pronounced angle at each side; snout long, two and one half times the 
leneth of the eye, widened opposite the posterior nostrils, and rounded 
from this point forwards. In an upper view the head bears some resem- 
blance to that of Esox. The skull has a strong,median internarial ridge 
and backward of this on the interorbital space there are two short keels. 
The opercular spine is prominent and strong; the spines on the pre- 
opercular region, those at each side of the parietals, and the group imme- 
diately behind each posterior nostril are very small. On larger specimens 
the spines are more reduced; on smaller ones, again, they are com- 
paratively much more developed. Small individuals have two series of 
preopercular spines, an anterior of three and a posterior behind the 
mucous cavities of six smaller ones on the hind edge of the preoperculum, 
Seen from the side the head is pointed, the depth at the end of the snout 
being little. Mouth very wide; maxillary extending backward more 
than half the length of the head, one diameter of the orbit, farther than 
the eye, its width at the end equal the length of the orbit. Teeth small, 
equal, in villiform bands on jaws, vomer, palatines, basibranchials, and 
pharyngeals. Vomerine band narrow, V-shaped, with apex forward and 
arms curving outward. Tongue rudimentary. Eye small, two fifths as 
long as the snout, one half of the interorbital space, and about one 
eighth as long as the head. Gills four, a short slit behind the fourth; 
rakers slender, close together, four, three of which are rudiments, on 
the upper branch of the first arch, and eighteen, five or six being rudi- 
ments, on the lower. On the older specimens the rakers deteriorate 
and become club shaped or otherwise deformed. Pseudobranchi small. 
Pylorie ceca three, rudimentary. Vertical fins continuous around the 
tail; dorsal origin above the axil of the pectoral; anal origin to snout 
one third of the total length, first anal ray below the twenty-seventh 
ray of the dorsal; caudal very small, slender, longer than the orbit, 
pointed, extending beyond the ends of dorsal and anal rays. Pectoral 
