THE SEA OTTER IN THE EASTERN PACIFIC OCEAN 349 



parasites, 103, 271-274, 294, 295, 315. 

 Pavlov Islands, Alaska, 182. 

 Patch, C. A., 183, 333. 

 Peden, A. E., 339. 

 Pedersen, R. J., 185, 333. 

 pelt, in commerce (see also fur), 40-42, 

 185. 



pentobarbital, 315. 

 Perleshin, S. D., 187. 

 Peromyscus, 29. 

 Peterson, R. L., iii. 



Peterson, R. S., 55, 59, 240, 243, 328, 

 333. 



Pierce, C, 307. 

 pinnipeds, 4. 

 piperazine citrate, 314. 

 play (see also behavior), 109. 

 Pleistocene, 4. 

 Pliocene, 4. 

 Poland, H., 40, 333. 

 pollution, environmental, 281. 

 pool, Amchitka, 290. 

 porpoise, speed of, 63. 

 Port Moller, Alaska, 173-175. 

 Poulter, T. C, 187, 333. 

 population : 



barrier, behavioral, 195. 



barrier, geographic, 194-195. 



dense isolated, 196-197. 



dispersal, 196. 



optimum density, 193-194. 



pressure, 324-325. 



rate of increase, 191-193. 



remnant, 189. 



sparse isolated, 197. 



sparse local, 197. 



summary, 198-200. 



world, 189. 

 Prasil, R. G., iii, 186. 

 Preble, E. A., 135, 181, 333. 

 preservation : 



stomachs, 113-115. 



reproductive tracts, 228. 

 preservatives used, 228. 

 Pribilof Islands, Alaska, 2, 133, 181- 

 182, 337. 



Prince William Sound, Alaska, 133, 



179-181, 285. 

 processing, pelt, 40-41. 

 promazine hydrochloride, 312. 

 Promyshlenniki, 1. 

 protection. Federal, 1, 2. 



propiopromazine hydrochloride, 313. 

 prostration, heat, 6, 311, 317, 321. 

 Puget, P., 184. 



Queen Charlotte Islands, Canada, 183. 



Radovich, J., iii. 

 Rankin, J., iii. 

 rat, 103, 252. 



Rat Islands, Alaska, 149-158. 

 Rausch, R. L., iii, 2, 270, 271, 272, 333, 

 337. 



recruitment rate, 245. 



Reeder, W. G., 243, 333. 



Reeve Aleutian Airways, 170, 317. 



Refuge, Aleutian, 1. 



regulations. Federal (see protection). 



Repenning, C. A., iii, 4. 



reproduction : 



blastocyst, 244. 

 birth : 



interval, 240. 

 place, 239-240. 

 rate, 245. 

 season, 22, 230. 

 breeding season, 235, 236. 

 conceptus, 231-232. 

 copulation, 217-219. 

 courtship, 214-217, 247. 

 counts of mothers, young, 228- 



229, 234-235. 

 females : 



nonpregnant, 232-235. 

 pregnant, 230. 

 fetus, 239-240, 243-245. 

 gestation period, 236, 244. 

 implantation, location, 230. 

 lactation period, 244-245. 

 length of cycle, 245. 

 length of stages of, 243. 

 mating of mothers having young, 

 221. 



pair bond, breaking, 220. 

 phases of, in female, 235. 

 postcopulatory period, 219-220. 

 precopulatory period, 214-217. 

 pregnancy : 



implanted, 229. 



location, 230. 



unimplanted, 229-230. 

 pupping season, 238. 

 rate of, 241-242. 

 separation, 220. 



