72 
BUI.LETIN OP THE BUREAU OF FISHERIES. 
Cottus asper Richardeon. Prickly bullhead. 
This species is a channel form, occurring in deep, quiet pools, and most often near the mouths of 
the rivers. It is easily caught with a baited hook. The following fin ray counts were made from speci- 
mens taken in the Pajaro River. 
Spines or rays 
Dorsal spines. 
Dorsal rays. 
Anal rays. 
Pectoral rays. 
7 
8 
9 
19 
20 
21 
i6 
37 
IS 
i6 
17 
I 
14 
lO 
8 
14 
3 
17 
8 
5 
i6 
4 
Cottus aleuticus Gilbert. Aleutian bullhead. 
Cottus aleuticus appears to be associated with C. asper, often being taken in the same seine haul 
with the latter. 
Cottus gulosus (Girard). Rifflefish. 
Cottus gulosus inhabits the upper courses of the creeks, apparently preferring the clear, cool water 
of the ripples, where specimens may often be seen lying on the bottom near large pebbles or bowlders. 
They approach food with short, jerky movements, always keeping close to the bottom. They are difficult 
to collect, as they usually dart under the lead line of the net if it passes over the least obstruction. 
Dorsal spines. 
Dorsal rays. 
Anal rays. 
Pectoral rays. 
Spines or rays 
7 
8 
9 
17 
18 
19 
13 
14 
IS 
14 
IS 
16 
Llagas Creek 
2 
i6 
2 
2 
12 
6 
I 
16 
3 
I 
18 
I 
