1867.] 



DR. A, GUNTHER ON NEW FISHES. 



103 



vertical^ from tlie front margin of the eye. Vertical fins united, the 

 anal very low ; dorsal spines small, feeble, almost hidden in the skin. 

 Body much elongate, its greatest depth being one-half of the length 

 of the head (without rostral appendage), which is one-tenth of the 

 total. Brownish black ; posterior part of the tail finely and irre- 

 gularly punctulated with black. 



A single specimen, 9 inches long, was presented by Dr. J. A. Smith 

 with other fishes from the Camaroon country. The occurrence of 

 Indian forms on the West Coast of Africa, such as Perioplithalinus, 

 Psetfus, Mastacembelus, is of the highest interest, and an almost new 

 fact in our knowledge of the geographical distribution of fishes. 



Arius australis. 



To judge from the description, this species would appear to be 

 allied to A. surinamensis. 



D. 1/7. A. 16-17. P. 1/10. 



Arius ansfrafis. 



