Index 



parallelum, 431. 

 paulseni, 433. 

 pellucidum, 429. 



var. acutum, 429. 

 pentagonum, 431. 

 perrieri, 433. 

 punctulatum, 431. 

 pusillum, 432. 

 quadridens, 432, 441. 

 quarnerense, 430. 

 rectum, 413, 429. 

 roseum, 430. 

 spiiiosum, 429. 

 steinii, 410, 430, 445. 

 subinermis, 431. 

 tabulatuni, 431, 443. 

 tenuissimum, 410. 

 thorianum, 403, 432. 

 tristylum, 429. 

 trochoideum, 432. 

 typus, 431. 

 umbonatum, 432. 



var. elpatiewskyi, 433. 

 westii, 431. 

 wiesneri, 430. 

 willei, 431. 

 Placoides tenuisculptus, 303, 320, 321. 

 Phalacroma, genus, 405. 

 Pholadidea penita, 308, 312. 

 Pholas pacificus, 303, 320. 

 Phvsopsis africana, 488. 

 Phytoplankton, 200. 

 "Plankton concept," 240, 290; valid- 

 ity of, 281-287. 

 Planorbis bahiensis, 488, 489. 

 boissiyi, 488. 

 guadelupensis, 488. 

 olivaceus, 488, 489. 

 Plasmotomy in Giardia microti, 17. 

 Polinices lewisi, 314. 

 Polychaeta, 62. 

 Polymastix, 382. 



Polynoe californica, 177, 213, 218. 

 complanata, 47. 

 filamentosa, 177, 183. 

 fragilis, 177, 213, 220; figures 



showing, 236, 238. 

 lordi, 177, 213, 224; figures show- 

 ing, 236, 238. 

 ocellata, 218. 



pulchra, 220, 224, 225, 226. 

 remigata, 177. 



scolopendrina, 221, 226, 227. 

 Polyrioidae, attributes of, 46; resem- 

 blance to Aphroditidae, 46 ; de- 

 scription, 46; definition of, 174; 

 division of based on distribution, 

 174; modes of self defense, 211, 

 228; changes in, 217; power of 

 regeneration, 217; muscular adap- 

 blanee to Aphroditidae, 46; de- 

 vantage of commensal habits, 

 219; adaptive coloration, 220, 



225; abyssal species, 222; ecto- 

 parasitic, 224. 

 Distribution of, 46; tables show- 

 ing, 176, 178, 184-190; bathy- 

 metrical, 179, 180, 181, 183; fac- 

 tors in, 191: temperature, 200, 

 206, ocean currents, 206, winds, 

 208, chemical composition of 

 water, 209, plasticity (variabil- 

 ity), 213; role of food in, 211. 

 Food habits, 47, 210, 211; influence 



of, on mode of life, 211-213. 

 Species of, number, 174; cosmo- 

 politan, 174; littoral, 182; deep 

 water, 183; commensal forms, 

 213, 215; influence on, of environ- 

 ment, 215, of depth, 215. 



Polynoidae from the Coast of Cali- 

 fornia, Description of Some New 

 Species of, 45. 



Polynoidae of the Pacific Coast of 

 North America, Factors Control- 

 ling the Distribution of, 171. 



"Porcupine" expedition, 172. 



Port Erin Marine Biological Station, 

 Isle of Man, 282, 400. 



Pottschapel, Saxony, 401. 



Pouchet, G., 96. 



Pouchetia, genus, 405. 

 cochlea, 96, 97. 

 cornuta, 96, 97. 



Prorocentrum, genus, 404. 



Protoeeratium, genus, 416. 



Protojieridinium, genus, 411. 



Protozoan Cysts in Mammalian 

 Faeces, A Rapid Method for the 

 Detection of, 145; description of, 

 147; value of, 148. 



Prowazek, S. von, cited, 1, 256, 358, 

 378. 



Prowazekella. See Prowazekia. 



Prowazekia lacertae, 345. 



Psephdia ovalis, 303, 320, 321. 



Pyrocystis, genus, 405. 



Pyrophacus, genus, 416, 420, 427. 



Quatrefage, cited, 62. 



Raia erinacea, 152, 157. 



Ramsay, L. N. G., cited, 207. 



Rankin, E. P., cited, 330. 



Reed, A. C., cited, 489. 



Retzius, G., cited, 129. 



Ritter, W. E., acknowledgment, 241. 



Robson, G. A., cited, 487. 



Rodenwaldt, E., cited, 5, 21. 



Row, R. W. H., cited, 145, 148. 



Sacramento-San Joaquin river sys- 

 tem, 32; tables showing dis- 

 charges of, 32, 33. 



Sagitta bipunctata, 202. 



Salinity of San Pablo Bay, 33, 35, 39, 

 42. See also Teredo diegensis. 



Salpa cabotti, 258, 259, 271. 



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