144 BULLETIN OF THE BUREAU OF FISHERIES. 
22. Hysterocarpus traskii Gibbons. J/"resh-water Viviparous Perch. 
Hysterocarpus traskii, Gibbons, Proc. Ac. Nat. Sci. Phila., 1854, p. 105, lagoons of lower Sacramento River. Jordan & 
Evermann, Fishes N. & Mid. Amer., pt.1, p. 1496, 1898. 
Sargosomus fluviatilis Agassiz, MS., Alexander Agassiz, Proc. Bost. Soc. Nat. Hist., vol. vi, 1861, p. 1301, Sacramento 
River. 
Docentrus lucens, Jordan, Bul. U. S. Geol. Surv. vol. Iv, 1878, p. 667, Sacramento River, erroneously ascribed to Rio 
Grande. 
Body deep and compressed, back strongly arched; mouth small, terminal, jaws even, maxillary 
not extending to eye; dorsal with about xvm spines and 11 soft rays; anal with 3 spines and 23 soft 
rays. Scales cycloid. 
Not very abundant, found in sluggish water. Readily distinguished from the Sacramento perch 
or sunfish by the small mouth and cycloid scales. 
Loca DisrRiBurion. 
Stream or lake. Collector. | Name as reported. 
Loeality. | | | Authority. 
—— —— = zf 
San Francisco markets | Sacramento River...--..--.- RSME A Beye et dA 9m | lysterocarpus traskii | Jordan & Jouy. 
| | | | Eigenmanh & Ulrey. 
beeee Oe 222.2 Ss hace be 2s Hlee oe cee eee eee | Sargosomus  fluvia- | A. Agassiz. 
| tilis. 
Fresh-water lagoons. - | sere 002 3 aec= Sse teeee Trask & Morris. ...--- sires kisses eee Gibbons, 1854a, 1854b. 
Pittville-2s 25-42. Pitti Rivers sees eee oe Rutter & Chamber- |.-.-- (6 Re ee 
| lain. | 
Redding! .e0 eee Sacramento River-......--:]...-- (clo e eee ee orem eer 
Fort Redding ..| Cow Creek. _.- Newberry ella: eae 
Dose Beige Spel nee dots: Iienshaw - } Girard, 1857-58. 
cofield_ 
United States hatchery, Battle Creek. 
Red Bluff. i Sacramento River. 
fing: See ee as do-.. 
Rutter & 5 
do... 
Clear Lake--- _..| Jordan & Gilbert. __- & 
Marysvilles sos -sem- 2-5 Weather River-)- 2... 22-2... | Rutter & Chamber- |....- 
lain. 
Pollaskyre cer ece-eeeeee San Joaquin River....-.---. | Rutter & Atkinson. - | bee doz are. 
Centerville. - China Slough. -- do. 
Doles ee ncenee: Bi Kin gsuRivers oonse ese aces scleeeete 
Jordan & Gilbert. 
Fig. 3.—-Cottus asperrima, new species. Type. 
23. Cottus asperrima Rutter, new species. 
Head 3.2 to 3.33 in length; depth 5.5; eye 3.5 to 4 in head; snout a little longer than eye; dorsal vr 
ay 
(or vy), 18; anal 14; pectoral 14; ventral 1, 3; caudal (branched rays) 7. 
Body slender, but not par- 
ticularly compressed, width of caudal peduncle 1.25 to 1.33 in eye, its depth slightly greater than eye; 
maxillary 2.5 in head, extending to vertical through anterior edge of pupil; 
profile flat or concave back 
of eye; anterior nostrils with conspicuous tubes; upper preopercular spine slender, sharp, almost 
straight, directed slightly upward, partly covered by the skin; second much shorter, triangular, directed 
toward lower base of pectoral, sometimes rudimentary; third spine wanting; 
interorbital space 0.5 of eye; 
spinous dorsal low, its outline not so strongly arched as in tenwis, spines very weak, longest about equal 
to eye, only five in one specimen; longest soft ray of dorsal about 2 in head; origin of soft dorsal in or 
