279 



? Arius argyropleuron Steindachner, Sitzber. Akad. Wien LVII. 1868, p. 1003. 

 Tachys^^rus argyropleuron Fowler, Proc. Acad. Nat. Sci. Phil. (2) LVII. 1905, 



p. 462. 

 Aritis argyropleuron Scale, Philippine Journ. Science V. 1910, p. 266. 



B. 6; D. I. 7; A. 1920; P. I. ii; V. 6. 



Elongate, height 4 3 / 4 5, head 3 1 / a , much broader than 

 high, its width about 2 / 3 of its length. Headshields with 

 roughened and granulated lines. Occipital process carinate in 

 young specimens, longer than broad, its lateral margins straight, 

 twice or more than twice longer than broad in its middle, 

 touching the basal bone of the dorsal, which has winglike 



Fig. 1 08. Arius argyropleuron C. V. X l1 /4- 



Fig. 109. Arius argyro- 

 pleuron C.V. Teeth of upper 

 jaw and palate X 2l /4- 



extremities. Median fontanel beginning at snout and ending 

 before the occipital process, broadest in the middle. Dorsal 

 profile sloping down in an almost straight line to the bluntly 

 rounded conical, slightly prominent snout. Eyes with a free orbital 

 margin, 4 ! / 2 7, situated about in the middle of the head, about 2 

 times in snout. The maxillary barbels extend on the pectorals 

 or not quite so far, mandibulary barbels somewhat shorter, 

 mental ones reaching to gillmembrane. Height of dorsal more 

 than 2 / 3 of head, its spine rather weak, equal to head without 

 snout, slightly denticulated at the top of its frontborder and 

 along the whole of its hindborder. Adipose fin small, its base 



