432 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 
c. Spinous ridges on seales, 7 to 9, usually 9. 
parallelus (Brauer, nec Giinther).* 
b*. Orbit smaller, about half length of snout, equal to interorbital 
width; spinules on scales of head excessively rough, 1 to 3 only 
on each scute along the ridges; sides of snout convex____spinifer. 
@ Under surface of the head wholly devoid of scales. 
ad’. Lateral spinules on seales about three-fourths as large as those on 
the median keel; first dorsal fin black at base, becoming silvery 
LTS ea ys a a ae a Ee ES aratrum. 
dad, Lateral spinules on scales much smaller than those on the median 
keel; first dorsal fin uniformly colored. 
e*. Orbit smaller, 2.0 in snout, two-thirds postorbital length of head. 
f*. Spination of scales weaker, the lateral rows very weak, with 
many small spinules; total number of series, 3 to 13 on each 
SiCar ee ae Se 2 aa a EE ee ee doryssus. 
/?. Spination of scales much stronger than in C. doryssus, the 
lateral series especially with fewer and stronger spinules; 
total number of series, 3 to 5 on each seale_____________ occa, 
e*. Orbit larger, 1.5 to 1.8 in snout, about equal to postorbital length 
Of head aes ie Se ee ee a a ee eee talismani.? 
QUINCUNCIA, new subgenus. 
Ty pe-species.—C oelorhynchus argentatus Smith and Radcliffe. 
This group includes, in addition to the type-species, two others de- 
scribed in this report—C. guincunciatus and C. thompsoni. These 
three species belong to the fauna of the Philippine Islands and the 
adjacent region to the southward; they are closely related to each 
other, and may be readily distinguished from all other members 
of the genus by the arrangement of the spinules on the scales in 
quincunx order (;-:) (not rising as serrulations along parallel 
or divergent carinae). The cardiform teeth of the upper jaw form 
a narrow band; the mandibular teeth are in two series, irregular 
anteriorly, in the type species, while in the two other species the two 
series become so irregular toward the symphysis that they form a 
narrow band. The anus is located far behind the head, immediately 
before the anal fin, and is not preceded by a naked fossa. The 
gland-like organ in the abdominal body wall is dilated at both ends 
—posteriorly just in advance of the anus, anteriorly in advance of 
the ventrals; this anterior lobe is supported, in the cavity that sur- 
rounds it, by a slender rod of cartilage connected with the posterior 
arm of the pubic bone. 
The relationships of this natural group and of its species are indi- 
cated in the preceding analytical key. There now follows a detailed 
description of each form. | 
= —— tet — — 
1The validity and position of this form are open to question. 
2 Coelorhynchus vaillanti Roule (1916) is a synonym of O. talismani. 
: 
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