APPENDIX. 
Description of an additional Neic Species of Fish from the 
Finl'e and Barcoo Fivers. 
By A. ZIETZ, F.L.S., 
Assistant Director of the South Australian Musenni, Adelaide. 
(Fig. 7, Plate 16 ). 
Plotosus apgenteus, n. sp. 
D. 1/4. C.+A. about 120. P. 1/7. V. 11. 
Body very compressed ; its height, wliich is equal to the length of the head, is 
contained a little more than five times in the total length ; the diameter of the 
eye is contained six times in the length of the head. Head convex above, width of 
interorbital space equal to the distance measured from the tip of the snout to the 
posterior margin of the eye. Eight barbels, the upper pair more than half the 
length of the head; the next pair, which are situated one on each side of the mouth, 
ai’e of about the same length. Of those situated on the lower jaw the outer pair 
are the longest, and nearly equal in length to the head. Body scaleless. 
Teeth in the upper jaw pointed; the outer series of teeth in lower jaw are 
likewise pointed, but the inner series are molar-like, like those on the vomer^ which 
form a triangular disk. A short dorsal with a simple spine and four rays is 
situated at the first quarter of the total length ; the spine of the dorsal and those 
of the pectorals are of about equal length. The ventrals are only about half the 
length of the pectorals, and have twelve rays. The caudal is united with the anal 
fin, and tei'ininates in an acute point. I counted about 120 fin-rays, of which the 
first are very minute. The lateral line is well marked and continuous. The colour 
of this specimen is yellowish, with a silvery tinge on the sides of the body. The 
whole fish, excepting the under surface, is minutely pitted with black. 
