PHILIPPINE MACROUROID FISHES—GILBERT AND HUBBS. 425 
ANALYTICAL KEY TO THE SUBGENBERA AND SPECIES OF CORLORHYNCHUS.? 
A*, Teeth in the lower jaw biserial or nearly so, at least on the sides; scales 
little strengthened on the weak ridges of the head; subopercle angulated 
at posteroventral angle, but without a distinct flap. 
B*, Teeth biserial in both jaws; anus remote from anal, and preceded by a 
single large naked fossa covering a glandular body not supported by a 
rod of cartilage; scales well imbricate, armed with spinules on strong 
divergent carinae; anterior portion of eyeball scaled; one Japanese 
STDECI CS 2 See tee oe See vat rE NOM nie Rt Ce ee |5 JS ABYSSICOLA 
macrochir. 
B*. Teeth in a ecardiform band in upper jaw; anus posterior in position, im- 
mediately in advance of anal; anus preceded by a long cylindrical 
organ with a dilation immediately before the anus, and another, before 
the ventral fins, supported by an arched rod of cartilage connected 
with the pubic bone;:scales poorly imbricate, armed with spinules 
arranged in quincunx order; eyeball wholly naked; three East- 
BURT CHEATS TOC 1G SB Ah I oe I eh ee ee QUINCUNCIA. 
. Underside of head naked; five or six series of scales between lateral 
line and origin of second dorsal; distance from anus to base of 
ventral in head, 1.8 to 2.3; distance from anus to isthmus in head, 
ALE yes Leach eee coi eee sei ee 2 pale ain ey ae eee BED heen) argentatus. 
a”, Underside of head scaled; four series of scales between lateral line and 
and origin of second dorsal; distance from anus to base of ventral 
in head, 2.4 to 3.5. 
b*. Rami of mandibles sealed; front of premaxillaries below middle of 
: nasal fossa; distance from anus to isthmus in head, 1.32 to 1.6; 
numerous proportions of fins and of parts of head generally like 
those of C. argentatus (see p. 445)_______ i fs 1 Sa quincunciatus. 
b* Rami of mandibles nearly scaleless; front of premaxillaries below 
posterior nostril; distance from anus to isthmus if head, 1.6 to 
2.0; numerous proportions of fins and of parts of head different 
from those of C. argentatus and C. quincunciatus (see p. 445) 
thompsoni. 
A*. Teeth of both jaws in villiform bands (sometimes reduced in the lower jaw 
to scarcely more than three series in the subgenus Oxrygadus). 
B*. Subopercle with posteroventral angle rounded; snout little produced; 
physiognomy much as in Quincuncia, the ridges of head weakly 
armed; anus never in advance of normal position just before anal fin; 
height of first dorsal fin less than postrostral length of head; a closely 
related group of six species known only from the Atlantic Ocean and 
GhHeSH aS tenna Pa Citi Ce aes ee See ede COELORHYNCHUS. 
a*. Spinules on scales arranged in quincunx order, without a median 
Series; no prominent median occipital scaly ridge; species of the 
North Atlantie. 
b*. Median scale of terminal rostral tubercles not so strong as the lateral 
pair; scaleless ventral fossa elongate, one-third as wide as long. 
c. Seales with smaller spinules; no prominent spot on first dorsal; no 
dark barks on body; a species of the eastern Atlantic___________ 
coelorhynchus. 
1 We include all of the known species with the exception of ©. labiatus (Koehler), the 
original description of which is not available to us. 
