400 CALIFORNIA ACADEMY OF SCIENCES. 28 
28. Netuma platypogon (Giinther). 
Very common at Mazatlan; several specimens taken in 
Astillero, where it is scarcely less abundant than Ga/ezch- 
thys gilbert. Also recorded by Dr. Gilbert from Mazat- 
lan, Libertad and Punta Arenas; by Giinther from San 
José; 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 
gilbert?. 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). BacGre CoLorapo. 
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. Eigenmann in referring the short de- 
scription of Sczades troscheli Gill to the species called 
Arius brandtii 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 ¢rvoschelz had the large 
