Index 



Pipilo maculatus, feathers, 381; fig- 

 ures of barljules, opp. 438, of 

 down barbules, opp. 446. 



Piranga rubra, color modifications, 

 383. 



Pista sp.(?), 208. 

 alata, 208. 

 elongata, 208. 

 typha, 208. 



Placoid scales of Ectcrodontus fran- 

 cisci, 149 ; preparation for study, 

 149; ventral type, 150, modifica- 

 tions, 151, 152, 158; dorsal type, 

 150, modifications, 154, 155, com- 

 plexity, 156, 157; dorso-ventral 

 transitional areas, 158; vari- 

 ations in size: embryonic spin- 

 ules, secondary scales, 160; cor- 

 related with function, 161 ; modi- 

 fied by function, 161. See also 

 Heterodontus francisci. 



Planesticus migratorius, filoplumes, 

 261, 262. 



Plataleidae, feathers, 320. 



Plate (vexillum), definition, 251. 



Plegadis guarana, feathers, 319; fig- 

 urges of barbules, 412. 



Pleurobrachia, seasonal variation in 

 abundance, 25; tables of num- 

 bers obtained, 25, 228-231; size 

 of specimens, 26; Pacific Coast 

 Pleurobrachia probably a variety 

 of P. pilens of the Atlantic 

 Coast, 29; effects of tempera- 

 ture and salinity on distribution, 

 32, 33 ; occurrence below surface, 

 35. 



Pleurobranchia bachei, collected in 

 surface hauls, 21. 



Plotinae, feathers, 309. 



Plotus, systematic position, 388. 

 anhinga, lack of filoplumes, 262; 

 silvery straw color, 276; figures 

 of barbules, opp. 408, of down 

 barbules, opp. 440. 



Plumules (down feathers), definition, 

 250; taxonomic value of distri- 

 bution, 386; unspecialized: evo- 

 lution from Ratitae, 255; morph- 

 ology, 255; nestling feathers, 

 259 ; occurrence and distribution, 

 255, 256, 258; oil gland feathers, 

 259; powder down, 258; struc- 

 ture, 257. 



Pocket Gopher, California, Anatom- 

 ical Adaptations in the Thoracic 

 Limb of, 447. 



Pocket gopher. See Gopher, pocket. 



Podargus. down, 375. 



strigoides, 372; figures of barb- 

 ules, opp. 436. 



Podarke, sp.(?), 177. 

 pugettensis, 177. 



Podilymbus podiceps, feathers, 300. 



Polyborus, feathers, 336. 



cheriway, feathers, 336; figures of 

 ljar))ul('H, o]ip. 418. 



Polychaetous Annelids of the Pacific 

 Coast in the Collections of the 

 Zoological Museum of the Uni- 

 versity of California, 175; bib- 

 ]iogra]ihy, "I2H. 



Polycirrus californicus, 208. 



Polydora caUfornica, 203. 



Polynoe fragilis, 181. 



Polynoidae, 179. 



Polyopthalamus australis, 216. 



Potamilla acuminata, 221. 



Prionotelus temnurus, feathers, 372; 

 figures of barbules, opp. 434. 



Procellariiformes, flexules, 272; 

 feathers, 302; down, 305; rela- 

 tionships, 306; epiphyology, sum- 

 mary, 306; systematic position, 

 388; figures of barbules, opp. 

 406. 



Progne subis, color modifications, 

 383. 



Prongs of barbules, definition, 254. 



Protula atypha, 226. 



Pseudomma, ge;nus, 15. 



Pseudomma, species, figures of, opp. 

 18. 20. 



Pseudopotamilla brevibranchiata, 224. 

 debelis, 225. 

 occelata, 224. 



Psittaci, powder-down, 258; refran- 

 gent surfaces in feathers, 278; 

 feathers, 365; down, 365; color 

 modifications, 366. 



Psophia, relationships, 353. 



viridis, feathers, 352; figures of 

 barbules, opp. 426. 



Psophiidae, feathers, 352; relation- 

 ships, 354. 



Pterochidae, feathers, 360. 



Pteroclis, down, 361. 



arenarius, feathers, 360; figures of 

 barbules, opp. 430. 



Pteroclo-columbae, feathers, 358; 

 down, 361, relationships, 362; 

 epiphyology, summary, 362; sys- 

 tematic position, 389; figure of 

 barbules, opp. 430. 



Puflfinus, down, 305. 



griseus, feathers, 304; figures of 

 barbules, opp. 406; down barb- 

 ules, opp. 440. 



Pycnonotidae, filoplumes, 262. 



Pvcraft, W. P., cited on filopumes, 

 261. 



Pvrocephalus, color modifications, 

 383. 



Querquedula, feathers, 328. 



Quill (scapus), definition, 250; taxo- 

 nomic value, 386. 

 Rabbit. See Jack rabbit. 

 Radius, definition, 252. 



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