THE TIDE-POOL FISHES OF CALIFORNIA. 
13 
Comparative measurements of five specimens of Oxycottus embryum. 
Measurements. 
Starks, Neah 
Bay, Wash- 
ington (type), 
L. S. Jr. 
U.M. (3128). 
Starks, Neah 
Bay, Wash- 
ington, L. S. 
Jr. U. M. 
(3128). 
Snyder, 
I’oiut Lobos, 
L. S. Jr. 
TT.M. (3428). 
Greeley & 
Cowles, 
Point Lobos, 
March, 1898. 
Greeley, j 
Point Lobos, 
June, 1898. 1 
Extreme length in millimeters 
55 
51 
49 
36 
41 
Greatest height of body 
24 
23 
23 
22 
23 
Least height of caudal peduncle 
8 
8 
8 
8 
8 
Length of caudal peduncle 
18 
19 
19 
18 
18 
Length of head 
28 
27 
29 
28 
29 
Width of head 
21 
21 
21 
20 
21 
Width of interorbital space 
6 
6 
5 
6 
6 
Height of pupil 
14 
14 
14 
14 
14 
Length of snout 
8 
8 
8 
9 
8 
Diameter of orbit 
6 
7 
6 
7 
7 
Distance from snout to spinous dorsal 
24 
25 
25 
26 
25 
Length of spinous dorsal at hase 
31 
30 
28 
25 
27 
Greatest height of spinous dorsal 
10 
10 
11 
12 
10 
Length of soft dorsal at base 
37 
37 
35 
36 
37 
Height of longest ray of soft dorsal 
14 
14 
14 
14 
15 
Distance fr om snout to anal 
52 
51 
52 
58 
50 
Height of longest anal ray 
14 
15 
14 
14 
15 
Length of caudal 
20 
20 
19 
19 
20 
Distance from snout to pectoral 
29 
28 
30 
31 
29 
Length of pectoral 
35 
36 
37 
36 
31 
Distance from snout to ventral 
30 
30 
34 
37 
30 
Length of ventral 
22 
23 
23 
23 
22 
Number of dorsal spines 
9 
9 
9 
9 
9 
Number of dorsal rays 
16 
16 
15 
15 
15 
Number of anal rays 
11 
11 
10 
10 
10 
Number of pectoral rays 
14 
14 
14 
14 
14 
Fig. 3 . — Rusciculus rimemis Greeley, type. 
RUSCICTJLUS Greeley, new genus. 
This genus is allied to Oxycottus, differing in the presence of minute prickly scales, which cover 
dorsal half of body. Preopercular spine simple, sharp. No slit behind the last gill. 
Rusciculus rimensis Greeley, new species. Fig. 3. 
Head 34; eye 4 in head; snout 34 in head; D. ix, 17 or 18; A. 14; P. 14; V. i, 3. 
Body compressed, very slender, caudal peduncle especially so; head depressed, flat; snout 
pointed; iuterorbital space § eye, grooved; top of head flat and slightly concave ; nasal spines large 
and blunt, snout abruptly decurved below them. Dorsal half of body covered with minute, imbed- 
ded, prickly scales partially arranged in obscure oblique rows, none below lateral line. Minute 
pointed teeth on jaws, vomer, and palatines; jaws subequal, mouth horizontal, maxillary reaching a 
vertical below anterior edge of pupil. Margin of preopercle armed with one sharp spine curved 
upward, below which are one aud sometimes two very short blunt processes; margin of opercle ending 
dorsally in a pointed flap Branchiostegals 6, the membranes broadly united, free from isthmus; no 
slit behind last gill. Dorsal tins scarcely joined, soft dorsal very large ; first dorsal beginning slightly 
in advance of opercular flap, upper edge much rounded, fifth spine longest; origin of soft dorsal just 
in front of origin of anal in female, directly above it in male, fin very long; pectorals large, reaching 
a vertical below ninth ray of soft dorsal ; origin of ventrals i>osterior to a point midway between anal 
