BULLETIN OF THE UNITED STATES FISH COMMISSION. 
16 
Hern described from a specimen taken at Pacific Grove, by Greeley & Maddren. (Type, No. 5846, 
L. S. Jr. Univ. Museum.) Five cotypes were taken at the same time. Specimens are at hand from 
Orescent City, Bolinas Bay, Half Moon Bay, Monterey Bay, and San Luis Obispo, Cal. Found in all 
kinds of pools from San Francisco to Monterey Bay, but nowhere common. Length, 60 mm. The most 
beautiful and active of the tide-pool fishes, extremely variable in color. 
Comparative measurements of eleven specimens of Dialarchus snyderi. 
Measurements. 
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Albatross, Monterey, 
L. S. Jr. IJ. M. (3642). 
Snyder, Pillar Point. 
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73 6 
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Greeley & Cowles, Pa- g. 
cifie Grove. £ 
Greeley & Cowles, Pa- ^ 
cific Grove. a 
Greeley & Maddren, 
Pac. Grove (type). § 
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© 
73 
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Greeley & Spaulding, 
Santa Cruz. 
Extreme length in millimeters 
58 
64 
59 
56 
61 
54 
60 
36 
65 
65 
62 
Greatest height ot' body 
26 
24 
24 
23 
25 
23 
24 
26 
28 
24 
25 
Least height of caudal peduncle 
8 
8 
8 
7 
8 
8 
7 
8 
8 
8 
8 
Length of caudal peduncle 
17 
17 
17 
17 
17 
15 
15 
18 
16 
18 
17 
Length of head 
33 
31 
31 
32 
31 
31 
32 
34 
31 
31 
30 
Width of head 
26 
24 
23 
24 
23 
24 
25 
26 
9 '2 
9.2 
25 
Width of interorbital space 
5 
5 
5 
6 
5 
6 
5 
6 
6 
5 
5 
Height of head at pupil 
14 
14 
14 
15 
15 
15 
15 
16 
15 
15 
15 
Length of snout 
9 
9 
9 
9 
8 
9 
9 
9 
9 
8 
9 
Diameter of orbit 
6 
6 
5 
6 
6 
6 
6 
6 
6 
6 
6 
Distance from snout to spinous dorsal 
30 
29 
27 
27 
26 
29 
29 
30 
28 
27 
28 
Length of spinous dorsal at base 
23 
25 
23 
21 
25 
22 
23 
21 
26 
24 
25 
Greatest height of spinous dorsal 
10 
10 
10 
10 
11 
10 
9 
9 
9 
9 
10 
Length of soft, dorsal at base 
44 
45 
44 
43 
44 
43 
43 
43 
44 
43 
42 
Height of longest ray of spinous dorsal 
12 
13 
13 
14 
13 
16 
13 
17 
12 
12 
14 
Distance from snout to anal 
43 
50 
44 
50 
48 
45 
50 
50 
45 
43 
47 
Height of longest anal ray 
14 
13 
13 
13 
13 
13 
12 
13 
13 
13 
13 
Length of caudal 
22 
21 
21 
21 
22 
21 
20 
22 
18 
20 
20 
I >istance from snout to pectoral 
32 
32 
30 
31 
29 
32 
32 
33 
29 
29 
29 
Length of pectoral 
34 
33 
31 
31 
31 
34 
32 
34 
32 
36 
35 
1 >i stance from snout to ventral 
32 
31 
32 
32 
29 
33 
33 
32 
27 
29 
29 
Length of ventral 
17 
17 
17 
17 
18 
37 
17 
17 
17 
17 
17 
8 
8 
8 
8 
8 
8 
8 
8 
8 
8 
8 
Number of dorsal rays 
19 
in 
19 
18 
18 
19 
19 
18 
19 
18 
19 
Number of anal rays 
14 
14 
15 
14 
13 
14 
14 
14 
15 
13 
14 
Number of pectoral rays 
14 
14 
14 
14 
13 
14 
14 
14 
14 
14 
15 
24 
22 
23 
23 
1 
Oligocottus maculosus (Girard). 
Oligocottus maculosus Girard, Proc. Ac. Nat. Sci. Phila. 1856, 153; Girard, U. S. Pac. R. R. Sur., x, 
Fishes, 56, 1858. 
Oligocottus borealis Jordan & Snyder, Proc. Cal. Ac. Sci., series 2, vol. vi, 1896, 225, Neali Bay (coll. 
E. C. Starks, type, No. 3396, L. S. Jr. Univ. Museum); Jordan & Evermann, Fishes of North 
and Middle America, n, 2014, 1898. 
This species was described by Girard in 1856, from specimens taken at Tomales Bay, but this 
account was erroneously associated with another fish, now recorded as Dialarchus snyderi. It was 
rediscovered and described as a new species, O. borealis, by Jordan & Snyder, from a large series of 
specimens taken at Puget Sound; hut Girard’s original name is now restored, as there is no doubt that 
this is Girard’s species. Inthisopinion Professors Jordan and Gilbert and Mr. Snyder fully concur. A 
series taken by Dr. Jordan at Sitka and a specimen collected by me at Prince William Sound extend the 
range northward to the latter point. It is the most common tide-pool fish at Crescent City, Del Norte 
County, Cal., and also at Half Moon Bay, where the shallow open tide-pools with little algae suit the 
species very well. South of Half Moon Bay it gradually becomes scarcer, but extends as far as Pigeon 
Point. None was taken at Santa Cruz or Pacific Grove. The absence of this species south of Pigeon Point 
is probably due to a change in the character of the tide-pools. Below Pigeon Point the coast is made 
up of great shelving ledges of very hard sandstone, with few pools. North of Pigeon Point the rocks 
are much softer and contain shallow jiools. Wherever found, this species inhabits all kinds of tide- 
pools, but especially those with dull surroundings, either bare rocks or rocks covered with Fueus, 
the brown seaweed. 
