350 



NORTH AMERICAN FAUNA 68 



reproduction — Cont. 



spermatogenesis, 247-248. 



sexual maturity: 

 age of, 229-230. 

 female, 245-246. 

 male, 247. 



summary of findings, 246-247. 



terms, definition of, 229. 



tracts, female, 225-228. 



twinning, 242. 



unimplanted period, 245. 

 research, biological, 3. 

 Reshetkin, V. V., 287, 293, 333. 

 Rice, D. W., iv, 339, 340. 

 Richardson, F., iii, 338. 

 Ritter, G., 250, 331. 

 Roosen-Runge, E. C, iii, 247-248. 

 Roppel, A. Y., iii, 261, 324, 326, 339. 

 running (see behavior). 



Sagen, L. V., iii. 



Sakhalin, U.S.S.R., 133. 



Samalga Island, Alaska, 170-171. 



Sanak Island, Alaska, 174-176. 



San Benito Islands, Mexico, 187. 



Sandman Reefs, Alaska, 174-176. 



Sand Point, Alaska, 176. 



San Francisco Bay, Calif., 281. 



San Juan Islands, Wash., 184. 



San Luis Obispo, Calif., 130. 



San Miguel Island, Calif., 186-187. 



San Simeon, Calif., 129. 



Santa Barbara Island, Calif., 186. 



Saxidomos (see clam). 



Scammon, C. M., 133, 187, 334. 



Scapino, R. P., iii, 42, 43, 334. 



scent glands, 4. 



Schaller, G. B., 108, 329. 



Scheffer, V. B., iii, iv, 2, 5, 21, 24, 28, 

 29, 31, 35, 37, 39, 44, 52, 53, 55, 157, 

 184, 238, 250, 299, 324, 326, 334, 338, 

 339. 



Schizothaerus (see clam). 

 Schneider, K., iv, 3, 53. 

 Schumacher, G. H., 42, 334. 

 Sczuck, E., iii. 

 Scott, D. B., iii, 50. 

 Scott, E. M., 111. 

 sea cow, Steller's, 239. 

 sea cucumber, 121. 

 sea lion, Steller, 103. 



sea urchin, 52, 128-129, 188. 



a starvation diet, 132. 



method of ingestion, 119, 121. 

 seal, fur, 34, 37, 39, 136, 324. 



mortality, 261. 



pregnancy, 230. 



twinning, 243. 

 seal, harbor, 102, 185. 

 Seattle Fur Exchange, 41. 

 Seguam, Island, Alaska, 168. 

 Semidi Islands, Alaska, 182. 

 Semisopochnoi Island, Alaska, 157- 

 158. 



Serripes (see clam). 



sex, identification of, 14-19. 



sex ratio, 241. 



Seymour, A. H., iii. 



shark predation, 278. 



shearwater, 131. 



shedding (see molt). 



sheep ranch, 170. 



Shelby, H., 186, 282. 



Shemya Island, Alaska, 147. 



Shidlovskaya, N. K., 119, 121, 287, 293, 



295, 334. 

 Shelter Cove, Calif., 130. 

 ship transport, 319. 

 Shumagin Islands, Alaska, 176-177, 



337, 339. 

 Siberia, 1. 

 sight, 55. 



in food finding, 107. 

 Simeonof Island, Alaska, 177. 

 Sinha, A. A., iii, 225, 228, 229, 232, 



236, 335. 

 sirenian, 4. 

 Sitka, Alaska, 183. 

 Skalkin, V. A., 65, 105, 204, 332. 

 skin: 



preparation, 42. 

 storage, 42. 

 Skripnikov, E. P., 188. 

 skull, study of, 42. 

 Slater, D. W., iv. 

 sleep (see behavior). 

 Slijper, E. J., 29, 239, 240, 335. 

 smell, 55. 



sense of, 286. 

 Smith, A. G., iii. 



Smith, T. A., iii, 273, 338, 339, 340. 

 smoking (of fur), 40-41. 



