296 Mr. G. A. Boulenger on Fishes 



Siluridaa . 



20. Pimelodus maculatus, Lac^p. 



21. Pimelodus ornatus, Kner. 



22. Pimelodus Muelleri^ Gthr. P. 



23. Pimelodus altipinnis, Stdr. M. 



24. Platystoma Vaillanti, C. & V. M. 



25. Piratinga Rousseauicii^ Cast. P. 



26. Arius Herzbergii^ Bl. M., P., S. 



27. Arius proops, C. & V. M. 



28. Arius luniscutisj G. & V. M. 



29. Arius rugispinis, C & V. M., P., S. 



30. Arius nuchalis, Gthr. M. 



31. Arius pleurops, sp. n. M. 



Palatine teeth villiform, in two widely separated transverse 

 patches which are narrower than the prffimaxillarj band. 

 Depth of body 4§ times in total length, length of head 3^. 

 Width of head | its length ; upper surface granular poste- 

 riorly ; fontanelle extending from the internarial region to 

 the base of the occipital process, which is keeled, nearly as 

 long as broad, and in contact with a very small crescentic 

 bone at the base of tiie dorsal ; naked parts of head with 

 reticulating or arborescent canals ; eye perfectly lateral, just 

 behind and on a level with the angle of the mouth, its 

 diameter 5 times in length of head, 1| in length of snout, 2^ 

 in interorbital width ; barbels short, not reaching gill-clett. 

 Dorsal I 6 ; spine nearly | length of head, granular in front, 

 with antrorse serration behind. Adipose fin small, its base ^ 

 that of dorsal. Pectoral spine slightly shorter than dorsal, 

 likewise granular in front and serrated behind. Anal 20, its 

 longest rays | length of head. Caudal deeply forked. 

 Brown above, silvery beneath. 



Total length 170 millim. 



The single specimen sheltered in its mouth eighteen eggs, 

 8 millim. in diameter, with embryos in an advanced state of 

 development. 



32. ^lurichthys Gronovii, C. & V. M. 



33. Auchenipterus striatulus, Stdr. 



34. Auchenipterus ?iodosus, Bl. M. 



Differs from the typical form in having the dorsal and 



