279 
? Arius argyropleuron Steindachner, Sitzber. Akad. Wien LVII. 1868, p. 1003. 
Tachysurus argyropleuron Fowler, Proc. Acad. Nat. Sci. Phil. (2) LVII. 1905, 
p- 462. 
Arius argyropleuron Seale, Philippine Journ. Science V. 1910, p. 266. 
Be Gotti. of 5) Asvroe=208 "P.. Tors Va. 6: 
Elongate, height 4°/,—5, head 3'/,, much broader than 
high, its width about 2/, 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. 109. Arius argyro- 
pleuron C.V. Teeth of upper 
jaw and palate X 21/4. 
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'/,—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 */, 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 
