BULLETIN OF THE BUREAU OF FISHERIES, 
VARIATIONS IN GASTEROSTEUS CATAPHRACTUS. 
Specimens with— 
a to 12 is 8 17 fm 
plates, plates, ull 
4 then an | then an platens | pated: Small 
Locality. 4to6 | 7or8 |9or10 RB LOS unpro- | posterior posterior e eae 
ected | tected | plates P' 
plates. | plates. | plates. space space One plates mens 
A followed | followed |_ small; eat 4t06 
| by a low | by a low | keel low. Kee! high.) plates. 
keel. keel. | | 
| 
ConniCreek= sess seee= 200 |. 
Napa River, Rutherford.. Gt) Remar as cased Mebane Sent cao se meee HES 
Napa River, Calistoga... aN sti Pimp egetes ec fiese: ~ mae ae ame a I Ra Done ges ame ee At 
Dry Creek, Healdsburg.........- SW ee scape aot |B Bibs | Noe A a | oe eee toaare Be ora areata 
Russian River, near Healdsburg 80 |. 
Russian River, Ukiah..........- 70 |. 
Roberts Creek, Ukiah........... Sale 
Wheatfield) Work iGualala River. Ses5- 0 See Ey 200 See Su ease Gee eS ee eh eee aaeeeties 
Junction Wheatfield Fork and Gualala River...|...- 
Junetion North Fork and Gualala River- Sale 
Garcia River, near mouth....... 
Garcia River, 5 miles from mouth. . 
Garcia River, 10 miles from mouth-~ 
Alder!Creekes! oo. edt eee ce caceee 
Navarro River, 4 miles above mouth. 
Navarro River, near Philo.........-- 
Navarro River, near Boonville 
Albion River, near Comptche.... 
Big River, 7 miles above mouth. 
South Fork of Big River...-.-- 
Noyo River......- 
Ten Mile River. 
Maple Creek... 
Usal Creek 
Mattole River, White 
Mattole River, Petrolia...... 
Bear River, Capetown. 
Van Duzen Creek.........-.- 
South Fork Eel River, Myers 
HIKARI G toe aee eee seyeee eel 
Mad River, near mouth..... 
Redwood Creek, near mouth 
Klamath River, near mouth. 
Smith River, near mouth.... 
Coquille River, near mouth. -. 
Deer Creek, Roseburg... ---- 
North Umpqua, Winchester... - 
Takenitch Creek, near mouth... 
Nehalem River, near mouth... 
McKenzie River, near Eugene. 
The Wakes WA banyiso-% sceo- sein ec eces soee ee sce 
34. Hysterocarpus traski Gibbons. 
Not known from the streams north of the Russian River. 
Russian and Napa rivers. 
35. Cottus asper Richardson. 
The extent of the prickly investment of the body is subject to considerable variation in this species. 
This variation often appears between specimens from different streams, but it is also common among 
individuals from the same stream. Usually the entire body, except the breast, abdomen, and caudal 
peduncle, is closely covered with rather coarse prickles. Often this armed area is reduced to a spot 
no larger than the pectoral fin, while occasionally it is much smaller. No entirely smooth examples 
In rare instances a loss of the palatine teeth accompanies a great reduction of the 
A third very small one sometimes appears 
have been seen. 
prickly area. Two preopercular spines are always present. 
below them. 
The species is commonly found in the lower courses of the streams, often being abundant in brackish 
or even salt water. It frequents deep, quiet pools, apparently being partial to a muddy bottom. 
Specimens were collected in nearly every river basin between the Columbia and Sacramento. 
