58 
BUIvIvETIN OE THE BUREAU OF FISHERIES. 
Orthodon microlepidotus (Ayres). Blackfish. 
This is a channel fish frequenting the deep pools and never appearing in the smaller creeks. In 
the Pajaro Basin it does not seem to occur in large numbers. It has not been seen in the San Lorenzo 
and it has been taken but once in the Salinas, Dr. Gilbert and Dr. Stowell having collected specimens 
near San Miguel. 
The dorsal rays number from 9 to ii; the anal 8 or 9; scales in lateral line 94 to 102; below lateral 
line 12 or 13; above lateral line 23 to 25; between occiput and dorsal 49 to 54. 
The following measurements are from specimens collected at Watsonville. 
Measurements of Specimens of Orthodon microlepidotus. 
Length of body mm . . 
IS4 
190 
200 
195 
202 
18s 
189 
182 
Length head 
0. 25 
0. 26 
0. 27 
0. 26 
0. 26 
0. 26 
0- 25s 
0. 27 
Depth body 
• 245 
•235 
. 225 
. 22 
. 22 
• 24 
■23 
• 245 
Depth caudal peduncle 
.08 
.08 
. 085 
.08 
.08 
.08 
.08 
.09 
Length caudal peduncle 
. 21 
. 21 
• 19 
. 21 
. 20 
. 21 
. 22 
• 21 
Length snout 
.08 
.88s 
.09 
.09 
.09 
• 085 
.085 
.09 
Diameter eye 
.04 
•045 
.04 
.04 
.04 
•045 
.04 
•045 
Interorbital width 
. 10 
. II 
• IIS 
. II 
. II 
. 105 
. II 
. II 
Depth head 
• 17 
• 17 
.175 
. i6s 
. 16 
•17 
• 17 
•175 
Snout to occiput 
. 20 
• 19 
. 20 
. 20 
. 20 
. 21 
• 19 
• 21 
Snout to dorsal 
•52 
• SIS 
• 535 
• SIS 
•52 
•53 
•53 
•54 
Snout to ventral 
•52 
•S 35 
•535 
•545 
•54 
•53 
•535 
•54 
Length base of dorsal 
•IS 
•17 
• 155 
• 145 
•IS 
• IS 
• 14 
•135 
Length base of anal 
. II 
. II 
. 10 
• IIS 
. 10 
. 105 
. 10 
. 10 
Height dorsal 
• 19 
.i8s 
.215 
• 19 
• 175 
. 20 
• 19 
. 205 
Height anal 
• 16 
. 16 
. 16s 
•155 
• 15 
•17 
. 16 
• 17 
Length pectoral 
• 17 
.18 
• 17 
• 19 
. 16 
. 21 
.165 
• 175 
IfCngth ventral. 
. 18 
• 17 
.18 
. 18 
• 15s 
.185 
. 16 
• 17 
Length caudal 
. 26s 
. 26 
.28 
. 26 
•25 
.28 
•27 
• 27 
Dorsal rays 
10 
II 
10 
9 
10 
10 
10 
10 
Anal rays 
8 
8 
8 
8 
8 
8 
8 
8 
Scales lateral line 
94 
94 
100 
102 
101 
95 
100 
102 
Scales above lateral line 
25 
23 
25 
23 
25 
24 
23 
24 
Scales below lateral line 
13 
13 
13 
13 
13 
13 
13 
13 
Scales before dorsal 
52 
52 
51 
49 
54 
50 
49 
51 
Lavinia ardesiaca, new species. Silver minnow. 
Minnows of this type found in the Pajaro system differ from Lavinia exilicauda of the Sacramento 
River in having fewer dorsal and anal rays, a somewhat heavier and less compressed body, and in other 
peculiarities. 
In L. ardesiaca the dorsal rays are usually 9 or 10 in number, most often 10, while in L. exilicauda 
they number from ro to 12, most often 11. The anal rays of L. ardesiaca number from 8 to 13, the maxi- 
mum number of examples having 10; the same rays of L. exilicauda number from ii to 14 with 13 as 
the most usual. These differences are well illustrated in the tables of measurements annexed to the 
description of the species. 
Description of the type no. 74459, United States National Museum, from the Pajaro River near 
Watsonville, Cal. Length 287 millimeters. (Fig. i, text.) 
Head 4.7 in length to base of caudal; depth 4.4; depth caudal peduncle 2.7 in head; eye 5.4; inter- 
orbital space 2.5; snout 3.4; dorsal rays 10; anal rays ii; scales lateral line 59; between lateral line and 
middleof back 14; between lateral line and base of ventral 7; between occiput and insertion of dorsal 38. 
Body of symmetrical proportions, the head small and pointed, the caudal peduncle slender and 
round ; dorsal outline rising in a nearly even curve to middle of back and then sloping gently to caudal 
peduncle. Eye located considerably in advance of middle of head, but not entirely above a median 
lateral line. Angle of mouth not reaching a vertical through anterior edge of pupil. Gillrakers on first 
arch, 19; each being a long, triangular, sharply pointed flap, the posterior edge of which is denticulate. 
