342 REPORT OF THE COMMISSIONER OF FISHERIES. 
with the original description of Leuciscus caurinus and without doubt 
belongs to that species, an example of which has not previously been 
seen by any observer since Richardson’s time. Superficially, Z. cau- 
rinus resembles Ptychocheilus oregonensis, as was pointed out by Rich- 
ardson, and as if to confirm that observation the specimen in hand was 
taken along with many individuals of the latter species, its identity 
not being discovered in the field. The specimen is here described in 
detail. 
Head 4 in length to base of caudal; depth 4.6; depth of caudal peduncle 3 in head; 
length of snout 2.9; maxillary 3.1; diameter of eye 5.6; width of interorbital space 
2.9; dorsal rays 10; anal 9; scales m lateral line 86. 
Body elongate, the width contained about 1.5 times in the depth; head long, the 
snout prominent; mouth large, end of maxillary reaching a vertical passing midway 
between anterior edge of orbit and pupil, upper lip without frenum; lower jaw 
included, its edge being posterior to tip of snout a distance equal to three-fourths the 
diameter of pupil; maxillary without barbel; distance between nostril and eye equal 
to half the diameter of eye; eye located nearer tip of snout than edge of opercle, a 
distance equal to its diameter; gillrakers on first arch 9 or 10, short, pointed; phar- 
yngeal teeth in two series, 2+-4 on the right arch, 1+-5 on the left; the lesser teeth 
slender and round, their tips curved away from the others; greater teeth consider- 
ably flattened, hooked at their tips, with a narrow though distinct grinding surface 
which is more pronounced on the middle teeth than on the outer ones. Peritoneum 
dusky. Exposed edges of scales semicircular; scales of breast and throat minute, 
those on back anterior to dorsal fin small, becoming minute and closely crowded 
on the nape; seales in series above lateral line 21, between dorsal and oeciput about 
59; lateral line complete, decurved in the region above pectoral fin; origin of dorsal 
fin midway between anterior edge of pupil and base of caudal, second fully developed 
ray longest, the last ray reaching slightly beyond it when the fin is depressed; free 
edge of fin slightly concave; origin of anal slightly behind base of last dorsal ray, 
first and last rays reaching an equal distance posteriorly when fin is depressed; pos- 
terior edge of fin slightly concaye; caudal deeply notched; origin of ventrals about a 
pupil’s diameter in advance of dorsal; tips of fins just reaching anal opening; pec- 
torals obtusely pointed. Color plain, dusky above, light below. 
The following measurements are expressed in hundredths of the length to base of 
caudal, which is 227 millimeters: Head 0.25; depth 0.22; snout to dorsal 0.56; snout 
to ventrals 0.525; depth of caudal peduncle 0.08; length of snout 0.09; maxillary 0.085; 
diameter of eye 0.045; interorbital width 0.085; depth of head 0.16; length of base of 
dorsal 0.18; longest dorsal ray 0.175; base of anal 0.11; anal ray 0.155; length of 
pectoral 0.18; ventral 0.155; caudal 0.27. 
