140 
BULLETIN OF THE UNITED STATES FISII COMMISSION. 
jaw and the smaller eye of C. crystallinum are at once distinguishing characters. Two specimens from 
the Guadalajara markets are shrunken, so that the orbit is larger and the teeth more evident than in 
those taken at Ocotlan. 
Measurements of six specimens of Chirostoma crytallinum. 
Measurements. 
Laguna de Chapala. 
Guadalajara 
market, 
Laguna de 
Chapala. 
Length of body, in millimeters 
206 
180 
186 
16b 
142 
170 
Depth of body expressed in hundredths of length 
22 
214 
21 
20 
20 
21 
Depth of caudal peduncle 
8.4 
9 
8 
9 
9 
84 
Length of head 
30j 
31 
31 
29 
31 
314 
Distance from snout to occiput 
22v 
22 
224 
22 
23 
23 
Tip of lower jaw to occiput 
244 
234 
25 
23 
25 
244 
Width of interorbital space 
64 
7 
7 
64 
6 
5 
Length of snout 
12 
12 
12 
114 
12 
12 
Diameter of orbit 
5 
5 
54 
54 
64 
6 
Distance from snout to spinous dorsal 
574 
554 
56 
55 
564 
564 
Insertion of spinous dorsal to soft dorsal 
11 
134 
12 
13 
12 
12 
Height of longest dorsal spines 
64 
8 
74 
Sh 
8 
8 
Height of longest dorsal rays 
13 
12 
13 
134 
15 
144 
Distance from snout to anal tin 
66 
65 
63 
61J 
65 
66 
Height of longest anal rays 
13 
14 
13 
14 
16 
16 
Distance from anal to caudal fin 
19 
18 
16 
19 
17 
174 
Length of caudal tin 
19 
18 
18 
20 
22 
21 
Length of pectoral tin 
17 
17 
17 
184 
20 
20 
Distance from snout to ventral fin 
50 
48 
49 
47 
50 
50 
Length of ventral tin 
11 
11 
11 
114 
114 
12 
Number of spines in first dorsal 
4 
5 
5 
5 
5 
5 
Number of rays in second dorsal 
11 
12 
13 
ii 
11 
11 
Number of rays in anal. 
18 
21 
24 
21 
22 
22 
Number of rays in pectoral - 
14 
14 
15 
14 
14 
14 
Number of scales in lateral series 
57 
57 
56 
60 
56 
56 
18 
19 
18 
17 
19 
Number of scales between dorsal fins 
9 
ii 
10 
11 
9 
8 
35 . Chirostoma ocotlane Jordan & Snyder, new species. 
Type No. 6160, L. S. Jr. Univ. Mus. Collected by J. O. Snyder, December 26, 1898, from Lago de 
Chapala, near Ocotlan, Jalisco, Mexico. 
Head 3.33 in length, depth 4.50; depth of caudal peduncle 3.25 in head; eye 4.33; snout 2.60; 
interorbital space 5; height of spinous dorsal 3.5; 
soft dorsal 2.16; anal 2; length of pectoral 1.60; 
ventral 2.50; caudal 1.50. D.v-12. A. 20. Scales 
in lateral series 54; transverse series 19; between 
. dorsals 11. 
Body long, rather slender, deepest part above 
ventrals. Head long, pointed, its dorsal contour 
straight from tip of snout to a point a little poste- 
rior to the eye, where it curves upward; interor- 
bital space flat; eye high up, nearer to tip of snout 
than to edge of opercle a distance about equal to 
diameter of pupil ; width of preorbitai space equal 
to diameter of pupil. Mouth oblique, cleft extend- 
ing downward to a point opposite lower edge of 
pupil; lips growing more fleshy posteriorly, the 
lower forming a fold across the. upper at their junc- 
tion; distal end of maxillary angular; extending 
almost to a vertical from anterior edge of orbit; 
lower jaw very long, projecting beyond upper a 
distance equal to diameter of pupil; viewed from 
above, both jaws are a little more pointed than are those of C, estor or C. humboldtianum. Teeth on 
jaws in hands, minute, projecting backward; no teeth on vomer or palatines. Gillrakers slender, 
close together; length of longest equal to diameter of pupil. Vertebra?, 44. 
A rather indefinite lateral line extending along body 10 scales below the first dorsal; the pores 
absent on many of the scales. Scales crenate, growing smaller dorsally, larger ventrally; those on 
posterior part of occiput, on nape, on region anterior to pectorals — above and below — and on base of 
Flo. 18.— Lateral and dorsal views of 
ocotlane. 
head ol' Chirostoma 
