;;o 



MOLLUSCA BRACHIOPODA 



tective coloration, 69 ; variation, 90 ; 



egg-capsules, 124 ; time of breeding, 



129 ; distribution, 363 n. 

 Purpuroidea, 4^3 

 Pusionella, 436 

 Pygocardia, 451 

 I'Uaope, 497 

 PyramkleUa, 432 

 Pyramidellidae, 262 

 Pyrazus, 50, 4^6 

 Pyrgina, 330 

 Pyrgida, 4^5 

 Pyrochilus, 44^ 

 Pyrolofusiis, 423 

 Pijnda ( = Pirula), 419, 420 ; spawn, 125 ; 



operculum, 269 

 Pythina, 453 



QUEXSTEDTIA, 4o6 



Quoyia, 260, ^17 



Rachiglossa, 220, 422 ; eggs, 124 



Bac/iis, 329-335, 441, 442 



RadioUtes, 4^6 



Radius, 419 



Radsia, 403 



Radula, 213 f. ; of Littorina, 20 ; of 



Vycloj}horus, 21 ; of jDarasitic Mollusca, 



79 

 Rueta, 434 

 Rnnella, 256, 420 

 Range of distriljution, 362 f. 

 Rangia, 15, 453 

 Ranularia, 420 

 Rapa, 423 

 Rapidia, 423 

 Raplunilus, 305, 309 

 Rathouisia, 316, 440 

 Rats devouring Mollusca, 57 

 Realia, 316, 327, 414 

 Reduzia, 4II 

 Rectum, 241 

 Registoma, 414 



Relationship of Mollusca to other groups, 5 

 RenssocUaria, 512 

 Reproductive activity of oyster, 112 ; 



system in Mollusca, 123, 134 f. 

 Requienia, 269, 455, 4.55 

 Respiration, 150 f. 

 Retzia, 508 

 Revoilia, 331, 4^4 

 Rcymondia, 332 

 Rhfdidoccms, 398 

 Rhugada, 311, 324 

 Rhenea, 325, 44O 

 Rhinoholus, 504 

 Rhiostoma, 247, 266, 309, 414 

 Rhipidoglossa, 225, 405 

 R/iizochdus, 75, 423 

 Rhodea, 356, 441 

 Rhodina, 307, 310, 442 

 Rhynchonella, 466, 470, 471, 472, 474, 



483, 4S7 ; distribution, 487 ; fossil, 492, 

 497, 499, 505 ; stratigraphical distribu- 

 tion, 506, 507, 508, 511 



Rhynclionellidae, 4S7, 501, 505 ; strati- 

 graphical distribution, 507, 508, 511 



PJn/sotf, 67, 310, 314, 316, 319, 44O 



Rhytida, 319-326, 333, 359, 440 ; habits, 

 54 ; radula, 232 



RUlya, 442 



Rimella, 4IS 



Rimula, 265, 4O6 



Ringicula, 430 ; radula, 230 



Pdsella, 413 



Rissoa, 415 



Rissoina, 415 



RohUhrrdia, 77 



RocJu'bninia, 331. 414 



Rock-boriug snails, 49 



Rolleia, 349 



Rossia, 3S9 



Rostellaria, 4IS 



Rudistae, 45f) 



Rumina, 260, 442 



Runcinu, 431 ; i)rotective coloration, 73 



Sabatia, 430 



Sactdceras, 394 



Sagda, 348-351, 44I 



.Sageceras, 398 



Salasiella, 353, 44O 



Salivary glands, 237 



Sandford, on strength of Helix, 45 



Sandwich islanders, use of shells, 99 



Saiiguinnlaria, 456 



Sarepita, 44"^ 



Sannatirns, 409 



Satsumn, 314, 316, 441 



Saxicuva, 447, 457 



Saxidonnis arata, money made from, 97 



Sccdaria, 247, 263, 4II ; radula, 224 



Scaldia, 452 



Smlenostomo , 422 



Smliola, 415 



Sccqjhauder, 428, 429, 430 ; radula, 231 ; 

 gizzard, 238 



Sea ph iff a, 399, 399 



Scaphopoda, 444 ', defined, 6 ; breatliing 

 organs, 160 ; nervous system, 205 ; 

 radula, 236 



Saiphida, 14, 305, 448 



Scarohus, 18, 278, 439, 439 



Scharft", R., on food of slugs, 31 ; on pro- 

 tective coloration in slugs, 70 



SchasicheMa, 347, 351, 354, 4IO 



Schismojje, 266, 407 



ScMzochiton, 187, 402, 403 



Schizodus, 44s 



Schizoglossa, 325, 440 



Schizoplax, 403 



Schizostoma, 413 



Schloenhacia, 398 



Scintilla, 175, 453 



