356 ADDENDA. 



keel -like crest; (posterior vomerine tcetli sometimes 

 deciduous) ; species of various habit, black-spotted, the last 

 rays of the dorsal and anal somewhat elongate. Salmo, 2. 



ff Vomer somewhat boat-shaped, the shaft depressed and the 

 teeth placed not directly on the sliaftbutou a raised crest, 

 which is posteriorly free; a band of stout recurved 

 teeth on the hyoid bone; scales small; caudal well 

 forked; dorsal and anal not elevated behind; species of 

 large size, gray-spotted^ not anadromous, inliabitiug 

 American lakes Cristivomek, 3, 



Iff Vomer somewhat boat-shaped ; the shaft depressed and 

 entirely toothless; scales very small, in 225 — 250 rows; 

 dorsal and anal not elevated behind ; species of rather 

 small size, crimson-spotted, the lower fins with marginal 

 bands of black and pale ; not anadromous, but some- 

 times descending to the sea, in salt water losing all 

 markings and becoming nearly plain silvery. 



Salvelinus, 4. 



In the following" account, I include all the species thus 

 far known from the waters of the United States, as the 

 general interest felt in this group of lishes seems to 

 render this arrano^ement desirable. 



/. ONCORHYNCHUS, 'Buckley. Hooked -Jaav Salmons. 



* Body not greatly compressed; upper jaw the longer; sexual 

 peculiarities excessively developed; size large. {Oncorhyn- 

 chus.) 



. 0. gorbuscba, (Walbaum) Gill & Jordan. Hump- 

 Back Sal:mon. Scales very small, in more than 200 

 transverse rows. N. W. Coast. (aS'. proteus^ Pallas. 

 S. gibber^ Bloch.) 



2. 0. keia, (Walb.) G. & J. Ekeavax. Scales 

 medium, in 170 (155 — 180) rows; B. 10. N. W. Coast. 

 (S. scoule7% Rich., S. lagocephalus^ Pall., aS'. confluetitus^ 

 Suckl.) 



