PHILIPPINE MACROTJKOID FISHES — GILBERT AND HUBBS. 495 



Pyloric caeca 21 in two paratypes of medium size, 19 in the largest 

 specimen. 



The scales are relatively large, being in 4£ (to 5) rows from the 

 origin of the second dorsal fin to, but excluding, the lateral line 

 series, in 5^ series between the second dorsal and the end of the 

 anterior curve of the lateral line, which is located behind the opercu- 

 lar angle a distance two-thirds as long as the head ; behind this point 

 the number of scale rows dorsal to the lateral line again decreases. 

 The scales of the body are armed with from 4 to 6 (3 to 7) strongly 

 spinous carinae, the median one of which is strongest, being armed 

 by about 4 spinules (6 in the largest specimen). 



Examined under the microscope, the structure of the scale is seen 

 to be similar to that of other species in the genus. The small focus 



Fig. 20. — Coelorhtnchus smithi. 

 longitudinal section of 



Type. Upper left hand figure represents 

 scale, to show structure of spinules. 



is surronded by fine, close-set circuli, which soon give place to coarser 

 circuli, which are evenly spaced to the margin of the scale on 

 all fields; they are parallel with the scale margin on the lateral 

 fields, but may terminate on the basal margin at an obtuse angle, in 

 which case the basal field is divided by a line along which the circuli 

 of each side meet at an acute angle; the circuli on the apical field 

 are perpendicular to lines drawn midway between the carinae. The 

 structure of the spinules is indicated in the figures above. Their 

 anterior and lateral edges appear as ridges, while the surfaces between 

 these ridges are concave. In certain rather definite areas on the tail 

 of a large specimen there occur scales which differ in certain features 

 from normal ones ; they are notably thinner, bearing rows of spinules 

 which are more numerous and subparallel instead of divergent; 

 their striae (circuli) are absent except near their margins. These 

 scales are evidently abnormal and in all probability have been re- 

 119404—20 9 



