72 BULLETIN OK THE BUREAU OP FISHERIES. 



Jordan, David Starr. 



1905. A guide to the study of fishes. New York. 

 Jordan, D. S., and Evermann, B. W. 



1896-1900. The fishes of North and Middle America. Parts I-IV. Bulletin, U. S. National 

 Museum, No. 47. Washington. 

 Maier, H. N. 



1906. Beitrage zur Altersbestimmung der Fische. I. Allgemeines. Die Altersbestimmung 



nach den Otolithen bei Scholle und Kabeljau. Wissenschaftliche Meeresuntersuchungen. 

 VIII Band. Abteilung Helgoland. Oldenburg. 



McMtTRRICH, J. PlAYPAIR. 



1912. The life cycles of the Pacific coast salmon belonging to the genus Oncorhynchus as revealed 

 by their otolith and scale markings. Transactions, Royal Society of Canada, Vol. VI, 

 Ottawa. 

 RuTTER, C1.0UDSLEY. 



1903. Natural history of the quinnat salmon. Bulletin, U. S. Fish Commission, Vol. XXII, for 

 igo2. Washington. 

 ScoFiELD, N. B. 



1900. A report on the planting of quinnat salmon fry in the short coastal streams of Marin County, 

 Calif. Appendix, Fifteenth Biennial Report, California State Board of Fish Commis- 

 sioners, 1897-1898. Sacramento. 

 1900a. Notes on an investigation of the movement and rate of growth of the quinnat salmon fry 

 in the Sacramento River. Idem. 



EXPLANATION OF PLATES. 



[The magnification of all photograplis is the same, X 35. Abbreviations: I indicates lateral line; c, primary check; ff, point distal 

 to which is intermediate growth; x, checii indicative of time of planting; isl yr., first year of growth; and 2d yr., second year 

 of growth.! 



Plate I. 



Fig. I. — Fry from Deer Island, Columbia River. April 13, 1916. Female, 51 mm. Part of skin 

 from near center of body, showing scales with from one to five rings. 



Fig. 2. — Isolated scale from the same specimen from which the skin shown in figiu^e i was taken. 



FiG. 3. — Fry from Point Ellice, Columbia River. June 12, 1916. Male, 68 mm. 



Fig. 4. — Fry from Point EUice, Columbia River. August 12, 1916. Female, 113 mm. Showing 

 a weakly differentiated intermediate band not preceded by a band of narrow rings. 



Fig. 5. — Fry from Crandall's seining ground, Grims Island, Columbia River. September 15, 1916. 

 Male, 76 mm. Showing winter rings at the margin of the scale. 



Fig. 6. — Fry from lake at Seufert, Greg. September 2, 1915. Male, 83 mm. Showing check at 

 X indicative of the time of planting. 



Fig. 7. — Fry from Clackamas River. August 30, 1915. Female, 114 mm. Showing primary 

 check and marginal winter rings. 



Fig. 8. — Fry from McKenzie River. November 3, 1915. Male, 107 mm. Showing primary check 

 and well-developed winter band at the margin. 



Fig. 9. — Fry reared at Clackamas hatchery, Oreg. December 15, 191 1. Male, 125 mm. A scale 

 with but slight differentiation, characteristic of hatchery fish. 



Plate II. 



Fig. I. — Fry from Point Ellice, Columbia River. October 16, 1915. Female, 116 mm. Typical 

 fall migrant, shomng marginal winter band. No primary check. 



Fig. 2. — Fry from same collection as figure i. Male, 117 mm. Showing primary check and mar- 

 ginal winter band. 



Fig. 3. — Fry from same collection as figure i. Female, no mm. The intermediate baud is pre- 

 ceded by a distinct band of narrow rings. No primary check. 



Fig. 4. — Frj' from same collection as figiure i. Female, 118 mm. Similar to figtire 3, except that 

 the primary check is present. 



