356 ADDENDA. 



keel -like crest; (posterior vomerine teeth sometimes 

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

 rays of the dorsal and anal somewhat elongate. Sai,mo, 3. 



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

 teeth placed not directly on the shaft but on 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, inhabiting 

 American lakes Cristivomek, 3. 



fff 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. 



SALVBLrmJS, 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 fishes seems to 

 render this arrangement desirable. 



1. ONCORHYNCHUS, Suckley. Hooked -Jaw Saimoits. 



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

 peculiarities excessively developed; size large, (fincorliyn- 

 chus.) 



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

 Back Salmon. Scales very small, in more than 200 

 transverse rows. N. W. Coast. {S. protetis, Pallas. 

 S. gibber, Bloch.) 



2. 0. keta, (Walb.) G. & J. Ekewak. Scales 

 medium, in 170 (155—180) rows; B. 16. N. W. Coast. 

 {S. scouleri, Rich., S. lagocephalits. Pall., S. confluertius, 

 Suckl.y 



