528 



DR F. A. BATHER. 



rectal lobe, Pleurocystis, 383, 394 ; P. anglica, 475 ; 



P. foriolus, 541 ; P. gihha, 526 ; P. procera, 



492 ; P. quadrata, 507 ; P. rugeri, 451. 

 reduction of pectinirhombs, Pleurocystis, 375, 



377. 

 Reed, F. R. C, 6, 12, 309, 560, 615. 

 Regularia, 264, 265, 269, 577. 

 respiration, 227, 605 ; Pleurocystis, 556, 558 ; anal, 



in Gotlmrnocystis, 238, in Dendrocystis, 590. 

 Reval, 288. 

 Rbtnolds, S. H., 449. 

 Rhipidocystidae, 16, 26, 34, 576. 

 Rhipidocijstis, 26, 31, 32, 34, 35, 36, 562, 569, 



576 ; bionomics and morphology, 586 : gigas, 



haltica. 

 Rhiwlas, 447, 454, 559. 



Limestone, 7. 



"rhomb-folds," 402. 



Rhombifera, 10, 19, 261, 577. 



rhomhoidalis, Leptaena, 467. 



"rhomb-ridges," 402. 



Richmondian, 565. 



ridged plates, Dendrocystis, 52. 



"right," 22, 23, 24, 25. 



Riksmuseuni, Stockholm, 468. 



Ringerike, 7. 



rohusta, Pleurocystis squamosa var., 350, 390, 408, 



409, 425, 577, tf. 66. 

 roots, Cheirocrinus, 305. 

 root-sacks, RMpidocystis, 586. 

 rossica, Dendrocystis, 42, 43, 82, 150, 159, 561, 



576, 587, tf. 10-12. 

 rotation of Cothurnocystis, 240. 

 rugeri, Pleurocystis, 377, 378, 380, 383, 390, 392, 



444, 44^, 464, 468, 470, 471, 472, 475, 476, 



477, 485, 500, 534, 551, 552, 553, 577, 609, 



PL V. ff. 57-59, tf. 69. 

 Russia, 7 ; see Baltic Provinces. 



sagittal plane, 22, 593. 



Saint Clair Limestone, 566. 



Salter, J. W., 444, 447, 448, 451, 454, 458, 461, 



477, 615. 

 Sambre-et-Meuse, 559. 

 sand, influence on Cystids, 559 ; on pectinirhombs, 



558; on Pleurocystis, 611. 

 sanitary principles in Pelmatozoa, 232, 583, 



591. 

 Saugh Hill group, 4, 5. 

 Schistes quartzeux, 559. 

 Schizocystis, 269, 281, 595. 

 Schmidt, F., 286, 288, 615. 

 ScHUCHERT, C, 565, 566, 615. 

 Scoliocystidae, 269, 272. 

 Scoliocystis, 269, 272, 281. 



scotica, Dendrocystis, 42, 43, 45, 46, 47, 48, 53, 58, 

 59, 63, 73, 79, 80, 82, 127, 561, 570, 576, 593, 

 PL ii. ff. 10-25, tf. 9. 



Scotland, 466. 



sculptus, Cheirocrinus, 307, 308, 598. 



Glyptocystites, 307. 



Scyphocrinus, 586. 



sedgiuicki, Cystidea, 41, 92. 



Dendrocystis, 41, 43, 47, 49, 52, 53, 58, 59, 



61, 63, 66, 74, 87, 107, 108, 149, 561, 576, 593, 

 PI. i. ff. 5-9, tf. 8. 



Sedgwick Mus., Cambridge, 446, 447, 449. 



sericea, Plecfambonites, 6, 467. 



Shalloch Mill, 4. 



shallow- water modifications, 613. 



Sholeshook Limestone, 7, 467, 559. 



"shoulder-angle," 395; Pleurocystis, 552. 



Silurian Cystidea, relations to Ordovician, 614. 



siluriana, Rafinesquina, 467. 



Smith, B., 7, 467, 615. 



Smith, W. R., 405, 416, 422. 



SoLLAS, W. J., 12, 227. 



Soluta, 26, 31. 



"spannleisten," 402. 



specialisation in shallow waters, 613. 



Spencer, W. K., 8, 565. 



" Sperrauten," 301. 



Sphaerocystis, 269, 274, 281. 



Sphaeronis, 559. 



Springer, F., 155, 405, 615. 



squamosa, Pleurocystis, 350, 369, 371, 380, 382, 

 385, 390, 403, 404, 437, 443, 551, 552, 553, 

 577, tf. 63-65. 



Starfish bed, 6, 7, 8, 9, 129, 172, 210, 312, 340, 

 467, 488, 503, 522, 537; bionomic conditions, 

 580 ; Cystid fauna, 559. 



Staurocephalus : glohiceps. 



Staurocystinae, 269, 275. 



Staurocystis, 269, 275, 281. 



stem, evolution of, 589 ; rudder-action in Cothurno- 

 cystis, 240 ; Ceratocystis, 257 ; Cheirocrinus, 

 304, tf. 47 ; C. constrictus, 328-332 ; Cothurno- 

 cystis, 166 ; C. curvata, 216, 220 ; C. elizae, 

 200-206 ; Dendrocystis, 81-88, 584 ; D. bar- 

 randei, 103-10& ; D. paradoxica, 159; D. rossica, 

 154 ; D. scotica, 145-148 ; D. sedgwicki, 121- 

 125 ; Pleurocystis, 385-389 ; P. anglica, 482 ; 

 P. foriolus, 548 ; P. gihha, 533; P. procera, 497 ; 

 P. quadrata, 516 ; P. rugeri, 462 ; P. squamosa, 

 tf. 63, 64. 



stereom, Cothurnocystis elizae, 194; Dendrocystis, 

 53 ; D. scotica, 134. 



Stewart, J., 422. 



Stockholm, Vetenskapsakademi, Riksmuseum, 468. 



striatus, Cheii'ocrinus, 307, 308. 



