FISHES OF OREGON AND NORTHERN CALIFORNIA. 173 
MEASUREMENTS OF PrycHOCHEILUS UMPQU.® FROM CALLAPOOIA CREEK, OAKLAND, OREG. 
; “ 192 | 176) (176 175 203 192 188 
en ed Se Res: ee he ee 27 265 | .28 265 | .275 275 | .275 
Depth body..... Bes a0 2) |) 22 20) |) = 215 21 | .21 
Snout to dorsal. . 59 .575 | .59 ; 575 57 | «58 
Snout to ventral -5D .565 | .57 .565 | .55 565 | .55 
Length of snout. 095 095 | .10 10 | .09 | 10 - 10 
Length maxillary. Aaah eullit ll 115 115.105 < ibe | sap ht 
Diameter eye... ..- Z 05 05 05 05 -045 | .045 045 05 
Interorbital width. 075 07 - 08 -075 | .07 -07 0 75 07 
Height dorsal. . 16 | 16 17 pills) “oalith)) Geatit| BAR Se 16 17 
Height anal. ..... 15 15 15 145 15 . 145 145 145 16 
Length pectoral. -20 19 165 16 175 | .18 19 16 195 
Length ventral. . 15 14 135 13 -135 | .15 15 13 15 
Length caudal. 24 | 24 23 2¢ 24 = 23 23 23 24 
Dorsal rays. - 9 9 9 9 9 9 9 9 9 
Anal rays.....- 8 8 al 8 8 8 38 8 8 
Seales lateral line. . . : 75 80 75 75 77 78 | 76 75 77 
Seales before dorsal. .....- e 65 63 62 64 62 | 67 60 66 
Scales above lateral line......................---.--- 21 23} 21 23} 22) 22 21 21 22 
15. Leuciscus caurinus Richardson. 
The Mylocheilus caurinus of recent authors is the species described by Agassiz and Pickering as 
Mylocheilus lateralis, and should not be confused with Leuciseus caurinus> of Richardson. 
A specimen of Leuciseus caurinus taken in the Willamette River near Corvallis is here described. 
Fic. 3.—Leuciscus caurinus Richardson. 
Head 4 in length to base of caudal; depth 4.6; depth caudal peduncle 3 in head; length snout 
2.9; maxillary 3.1; diameter eye 5.6; width 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 foramen; 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 itsdiameter. Gillrakers on first arch 9 or 10, short, pointed. Pharyngeal 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 considerably 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 ante- 
rior to dorsal fin small, becoming minute and closely crowded on the nape; scales in series above lateral 
line 21, between dorsal and occiput about 50; 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 close behind base of last dorsal ray; first and last rays reaching 
a Agassiz, L., American Journal Science & Arts, vol. XIX. 1855, p. 231. 
» Richardson, John, Fauna Boreali-Americana, vol. 1, 1836, p. 304. 
