432 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



c 3 . Spinous ridges on scales, 7 to 9, usually 9. 



parallelus (Brauer, nee Giinther). 1 



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 spinifcr. 



a 2 Under surface of the head wholly devoid of scales. v 



d 1 . Lateral spinules on scales about three-fourths as large as those on 

 the median keel ; first dorsal fin black at base, becoming silvery 



distally aratrum. 



d'. 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 



scale doryssus. 



f. 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 scale occa. 



e 2 . Orbit larger, 1.5 to 1.8 in snout, about equal to postorbital length 

 of head talisman*.* 



Quincuncia, new subgenus. 



Type-species. — C oelorhynchus argentatus Smith and Radcliffe. 



This group includes, in addition to the type-species, two others de- 

 scribed in this report — G . quincunciatus 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. 



1 The validity and position of this form are open to question. 



2 Coelorhynchus vaillanti Roule (1916) is a synonym of G. talismani. 



