400 CALIFORNIA ACADEMY OF SCIENCES. 



28. Netuma platypogon (Giinther). 



Very common at Mazatlan; several specimens taken in 

 Astillero, where it is scarcely less abundant than Galeich- 

 thys gilberti. Also recorded by Dr. Gilbert from Mazat- 

 lan, Libertad and Punta Arenas; by Giinther from San 

 Jose; and by Steindachner from Magdalena Bay and 

 Callao. To the southward it is very abundant. 



In some specimens, perhaps females, granulations are 

 visible on the occipital process only, the other bones be- 

 ing covered by smooth skin, as in the subgenus called 

 Galeichthys. This species much resembles Galeichthys 

 gilberti. It is, however, readily known by the short, 

 pale ventrals, as well as by the generic character of the 

 backward extension of the palatine bands of teeth. 



29. Netuma kessleri (Steindachner). 



Recorded by Steindachner from Altata; recorded from 

 Panama both by Gilbert and Steindachner. Not taken 

 by us. 



30. Sciadeichthys troscheli (Gill). Bagre Colorado. 

 Rather common in the Astillero at Mazatlan, reaching 



a considerable size. Also taken at Mazatlan by Gilbert, 

 at Altata by Steindachner; found by Gilbert and Steind- 

 achner at Panama, and by Gilbert at Punta Arenas. Its 

 general coloration is decidedly reddish or coppery. The 

 sculpture of the large dorsal shield and of the occipital 

 process is subject to considerable variation, and possibly 

 more than one species of this type exists. 



We follow Dr. Eis^enmann in referring- the short de- 

 scription of Sciades troscheli Gill to the species called 

 Arius hrandtii by Steindachner. Dr. Gill does not fully 

 describe the dorsal shield and the type of his description 

 is lost. In recalling the matter to his memory, he is, 

 however, positive that the type of troscheli had the large 



