XII 
CONTENTS. 
Order IV. Pliysostomi or Malacoptcri—Continued. 
Gila .. 284 
1. Gila robusta_ 285 
2. Gila elegans .......... 286 
3. Gila gracilis....... 287 
Tigoma. 288 
1. Tigoma conformis_ 289 
2. Tigoma bicolor_ 289 
3. Tigoma obesa.......__ 290 
4. Tigoma humboldti._.... 291 
5. Tigoma egregia..__._ 291 
6. Tigoma lineata_......._ 292 
7. Tigoma gracilis__ 293 
8. Tigoma crassa_ 293 
Cheonda.. 294 
1. Cheonda cooperi_ 294 
2. Cheonda coerulea___ 295 
• Siboma_ 296 
1. Siboma crassicauda_ 296 
2. Siboma atraria_ 297 
Ptychocheilus___ 298 
1. PtychocLeilus oregonensis __ 298 
2. PtychocLeilus grandis_ 299 
3. Ptychocheilus rapax___...._ 300 
4. Ptychocheilus vorax_ 301 
Clinostomus_ 302 
Family Cyprinodontidae_ 302 
Fundulus. 303 
Fundulus parvipinnis_ 303 
Family Esocidae_ 304 
Family Salmonidae_ 304 
Salmo_ 305 
1. Salmo scouleri_ 305 
2. Salmo quinnat_ 306 
3. Salmo spectabilis_..........._......._ 307 
Fario_ 308 
1. Fario aurora_ 308 
2. Fario tsuppitch_ 310 
3. Fario argyreus_ 312 
4. Fario gairdneri_ 313 
5. Fario clarkii_ 314 
6. Fario stellatus_ 316 
Salar_ 318 
1. Salar lewisi____ — -..... 318 
2. Salar virgiualis_ 320 
3. Salar iridea___..._...-- 321 
Osmerus___ 323 
Osmerus pretiosus_ 324 
Thaleichthys_....._______ 325 
Thaleichthys stevensi_ 325 
Coregonus_ 326 
Coregonus vvilliamsoni_- — -..... 326 
Family Scopelidae_____......._ 328 
Saurus (Laurida) lucioceps_ 328 
Family Clupeidae___ 328 
