156 DEEP SEA FISHES. 
body is compressed and slender; its greatest depth is about one tenth of 
the total length; the length of the body cavity is contained three and one 
half times in the total. Head one seventh of the entire length; width of 
the parietal section equal to the rostrorbital length; arched across the 
crown and forehead, and flattened some above the orbits; cephalic spines 
short, opercular spine with a keel; angles low. Snout broad, blunt, broadly 
rounded in front, as seen from above, length equal to the width across the 
eyes, or to one and one half times the length of the orbit. Mouth large, 
cleft nearly half the length of the head; maxillary extending one half the 
orbital length backward of the orbit, greatest width three fourths of the 
length of the orbit, upper, lower, and hinder margins concave. Teeth very 
small, in villiform bands on jaws, palatines, and on the V-shaped end of the 
vomer. Eye moderately large, two thirds of either rostral length or width 
of interorbital space, less than one fifth as long as the head. Bones of the 
skull thin, mucous cavities greatly developed. The two series of preopercu- 
lar spines are quite small and short; the other spines of the head are lo- 
cated as in P. longiceps, but are so small as to be found more readily by the 
touch than by the sight. Dorsal origin but little backward of the axil of 
the pectorals. Anal origin below the twenty-third ray of the dorsal fin. 
Pectorals small, narrow, four sevenths as long as the head. Ventrals of 
two filamentary rays, separate nearly to their bases; longest ray as long as 
the pectoral fins. Caudal region slender, fin thread-like. Lateral lines 
three, more distinct anteriorly, uppermost short. 
Sides of the head, from the nostrils, maxillary and operculum, and chin, 
belly, and fins black; top of head to suborbital tract white ; muscular tracts 
light reddish brown. There are indications of a red or purple cast over the 
muscles and the bases of the fins in life. 
Station. Latitude. Longitude. Depth. Temperature. Bottom. 
34385 26° 48’ N. 110° 45’ 20” W.- 859 fathoms Sino Br. M. bk. Sp. 
3436 Die s4aN 110° 53/ 40” W. 905 : Sipoe iy xe ae 
MonoMITopUvs. 
Monomitopris Alcock, 1890, Ann. Mag. N. H., VI., 297. 
Body and head compressed, covered with scales. Head short and deep ; 
skull with median keels. Lateral line near the dorsal fin, distinct anteriorly. 
Mouth anterior, wide, oblique. Teeth small, numerous, in villiform bands 
on jaws, vomer, and palatines. Eight branchiostegal rays. Pseudobranchiz 
