120 BULLETIN OF THE BUREAU OF FISHERIES. 
Locan DistripuTion. 
Locality. Stream or lake. Collector. Name as reported. | Authority. 
eso ees recs Ayres..................| Petromyzon ciliatus.........| Ayres, 1854-1857. 
San Francisco Bay.|----- fa oS eno sneeenses ast done apaeeee ee eee Girard, 1858. 
Sullaway Creek....- Rutter & Chamberlain -| Entosphenus tridentatus. - .. 
Ghoccsinniee jHenshaw...--..---.-- .---| Lampetra sp... ----)--.-__-. Jorden & Henshaw. 
_ “>> ~>"7>")\ Rutter & Chamberlain .| Entosphenus tridentatus - - - - 3 
South Fork post- | South Fork Pitt |..... (Opes oeeresoesesran-||scn a9 dO esos -5ce see ee ee 
office. River. 
Fort Redding....... Cow Creek Petromyzon tridentatus. --.- Girard, 1858. 
Lace doseees -| Entosphenus epihexodon ...-.) Gill. 
Clear Lake -| Entosphenus tridentatus..... Jordan & Gilbert, 1894. 
Parrot Ferry....-.-- Stanislaus..........] Rutter & Atkinson.....|..... (0 Wee eore case tuaos sees 
2. Lampetra cibaria (Girard). Western Brook Lamprey. 
Petromyzon plumbeus Ayres, Proc. Cal. Ac. Nat. Sci. 1854, p. 28, San Francisco. 
Ammocetes cibarius Girard, Pac. Ry. Survey, p. 383, 1859, larva, Puget Sound. 
Lampetra cibaria, Jordan & Evermann, Fishes of North and Middle America, pt. 1, p. 13, 1896. 
Diameter of buccal disk 3.3 in head in front of first gill opening. Supraoral lamina with a tooth 
at each end, none in middle; middle denticle of lingual tooth enlarged; infraoral lamina crescent 
shaped with 7 teeth, the 2 outer bicuspid; 3 teeth on each side of mouth, the middle one of each 
series tricuspid, the others bicuspid; several inicuspid teeth above mouth; diameter of eye 1.5 in dis- 
tance from eye to first gill opening; head in front of first gill opening 8.5 in body; dorsal fins sepa- 
rated by one-seventh the length of the anterior fin; a broad notch in second dorsal near posterior end; 
‘ greatest depth equal to length of snout. 
Loca DIstTRIBUTION. 
| 
Stream. Basin avicion!| Collector. Name as reported. | Authority. 
be 
fo} 
f) 
& || 
es 
= 
| Petromyzon plumbeus, Ayres, 1854-1857. 
San Francisco-......- | San Francisco Bay.) Sacramento -- n plu 
Lampetra cibaria ..--- 
At mouth of Feather | Sacramento River..|..... Once fac20 | 
River. | | | berlain. | 
| 
3. Pantosteus lahontan Rutter. 
Pantosteus lahontan Rutter, Bul. U. S. Fish Comin. for 1902 (March 31, 1903), p. 146, Suisun River (type no. 50587, U.S.N.M.) 
Coll. Rutter & Chamberlain. 
Taken only in the headwaters of North Fork of Feather River—Warner Creek at Johnsons, and 
North Fork of Feather River at Big Meadows, by Rutter and Chamberlain. Largest specimen 3.7 inches 
long. 5 
4. Catostomus microps Rutter, new species. 
Head 4.5 in length; depth 4.7; eye 6.5 in head (6-inch specimen), 2.2 to 2.3 in interorbital space, 
which equals snout; dorsal 11; anal 7; scales 17-81 to 87-14, lateral line complete; body heavy; head 
small, conical; snout blunt; interorbital space rounded, cross section of head being nearly circular; 
eye small, in middle of head; mouth small, lips thick, 2 rows of papillee on upper; lower lip deeply 
incised, 1 row of papillze across symphysis, 5 cross rows on lobes; cartilaginous sheaths well devel- 
oped in both jaws; fontanelle almost obsolete in specimens 6 inches long; origin of dorsal in middle of 
body, its height 1.5 in head, its margin slightly rounded anteriorly; anal reaching rudimentary caudal 
rays; ventrals about 1.5 in head; pectorals 1.2; caudal 1 to 1.2, deeply emarginate or slightly forked; 
depth of caudal peduncle 2.7 in head; peritoneum dusky. 
Differs from the related species, occidentalis, found in the same region and from snyderi from the 
Klamath region in the very small eye, small conical head, and small scales, and in the nearly closed 
fontanelle. The lips are not notched at the corner, as in Pantosteus. 
