46 
(N. 13 ° 33 ' 36 " E. 123 ° 49 ') 
Length 195 mm. 
In 550 fathoms. June 19, 1909. 
Genus XENOGNATHUS Gilbert 
■A.enogna ^hus GILBERT, Proc. U.S. Hat. Mus., vol* 48, 1915, p.311. Tvpe Xen— 
c n ognathus 'profundorum GILBERT, orthotvnic. 
p4 f_ 
Body compressed, elongate, head deeper than wide. Snout depressed 
ax tip, bounded anteriorly by strong, sharp, osseous crest on basal part of 
premaxillaries. Eye rather small, anterior. Premaxillary greatly expanded, 
f oi*ms plate extending nearly horizontally backward and completely receives 
deep mandible within. Teeth slender, cardiform, present on premaxillaries, 
mandible and front of palatines. Opercular flap voluminous. Gill membranes 
separate. Branchiostegals 6. Scales very small, cycloid, pores in lateral 
larger or about 62. Dorsal shorter than anal, origin behind anal origin. 
Caudal forked. 
One species in the Eastern Pacific. 
Xenognathus profund orum Gilbert 
Xenognathu s profundorum GILBERT, Proc. U.S, Nat. Mus 
pi.14, fig.2. -N. 33 0 2 » 15 " W. 120 0 42 ‘, 
., vol.48, 1915, p.311, 
1350 to 2182 fathoms, off 
Catalina Island* 
Depth 4 l/s; head 3, width 2 l/2* Snout to eye 3 in head; orbit 4; 
eye 6 1/3, 2 in snout to eye, 2 in interorbital, 1 3/5 in bony interorbital; 
maxillary reaches opposite hind eye edge, expansion 1 4/5 in eye, length 2 l/4 
in head; interorbital 3 l/5, bony interorbital 4 l/5, with broad convex ridge 
ao6ve each eye, separated by broad median depression extending back to become 
deeper and larger just before occiput* Gill rakers 4-^. 14, lanceolate, 1 3/4 
