342 REPORT OF THE COMMISSIONER OF FISHERIES. 



with the orie^inal description of Leuciscus caurljius and without doubt 

 belongs to that species, an example of which has not previously been 

 seen by any observer since llichardson's time. Superficiallv, L. cau- 

 rimis resembles Ptychocheilus oregonensis^ as was pointed out b}^ Rich- 

 ardson, and as if to confirm that observation ih<i 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 in 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- 

 jmgeal 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; scales in series above lateral line 21, between dorsal and occiput 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 concave; 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 Avidth 0.085; depth of head 0.16; length of base of 

 dorsal 0.13; 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. 



