CARADOCIAN CYSTIDEA FROM GIRVAN. 



527 



Ottawa Museum, 406, 412, 424, 430. 

 outline of theca, Pleurocystis, 394. 

 Oxford Univ. Mus., 446, 447, 449. 



Pagan, A., 449. 



Pakenham, Ont., 405. 



parabola, PhiUipsinella, 6. 



paradoxica, Dendrocystis, 42, 43, 155, 562, 576, 

 tf. 13. 



paradoxicus, Syrinfjocrinus, 42, 155, 576. 



Paradoxides, 572 ; hypostome, 247. 



Paradoxidian, 589. 



paradoxus, see paradoxicus. 



parietal pore, Pleurocystis, 379 ; see also gonopore. 



parietal septum, Pleurocystis, 384. 



Pascal, B., 383. 



Pawlowsk, 288. 



Peach, B. N., 4, 6, 8, 392, 567, 615. 



pectinirhombs, reduction, 335, 347 ; relation to 

 gut, 606, tf. 45 ; Gheirocrinus, 298, tf . 46 ; C. 

 constrictus, 319 ; C. interruptus, 345, 346 ; in 

 Pleurocystis, 375, their number, 398, reduction 

 of, 555, compared with Cheirocrinus, 556, 557, 

 558, shape, 399 ; P. anglica, 476 ; P. foriolus, 

 542 ; P. gibba, 527 ; P. procera, 493 ; P. 

 quadrata, 508, 518 ; P. rugeri, 453. 



pectinirhomb 11-12, Cheirocrinus, 602. 



Pelmatozoa, Jabkel's classification, 15. 



penniger, Cheirocrinus, 288, 293, 307, 308, tf. 40, 

 40 bis, 41. 



Cyathocrinitis, 288. 



pennigera, Glyptoeystis, 359. 



Pentacrinoidea, 15. 



periproct, enlargement in Cheirocrinidae, 596-606 ; 

 enlargement and position, Cheirocrintis, 598- 

 604 ; C. constrictus, 321 ; Pleurocystis, 37 1, 380, 

 401, 553 ; extension of, 383 ; P. anglica, 479 ; 

 P. foriolus, 545 ; P. gibba, 530 ; P. quadrata, 

 512; P. rugeri, 456. 



periproctals, Cheirocrinus constrictus, 322 ; Pleuro- 

 cystis, 380, 400, 554; P. anglica, 458, 479; 

 P. foriolus, 546; P. gibba, 531; P. quadrata, 

 513, 518; P. rugeri, 457. 



Perner, J., 12, 74, 92, 93, 110. 



perneri, Ceratocystis, 255-260, tf. 33-35. 



perturbatus, Bellerophon, 6. 



Petersburg, 288, 339. 



Academy, 35, 338. 



pharyngeal clefts, 241. 



PhiUipsinella parabola, 6. 



Pilocystites, stem, 589 : priraitius. 



Piroeystis, 72, 588 ; stem, 589. 



Placocystif, 23, 25, 26, 245. 



plate 5, Pleurocystis, 552. 



plate 13, Pleurocystis, 370, 371. 



TRANS. ROY. SOC. EDIN., VOL. XLIX. PART II 



plate 23, Pleurocystis, 370. 



plates, Cothurnocystis elizae, 192, 193; Dendrocystis, 



50 ; D. barrandei, 97 ; Z). scotica, 133 ; D. sedg- 



wicki, 114; Pleurocystis, 366, 540; P. anglica, 



471, 484; P. gibba, 525; P. procera, 491 ; P. 



quadrata, 506, 518. 

 Platycystites, 37, 562, 576 : faberi. 

 Plectambonites : sericea. 

 Pleurocystida, 363. 

 Pleurocystidae, 269, 362, 365. 

 Pleurocystid^es, 360. 

 Pleurocystiden, 358. 

 Pleurocystinae, 285. 

 Pleurocystis, 10, 269, 276, 278, 281, 348, 3^9, 559, 



560, 565, 575, 577, 596; affinities, 352-365; 



analysis, 366-374, tf. 60, 61; habit, 376; 



history, 351 ; relation to sea-floor, 608, 609 ; 



species, British and American compared, 553 ; 



distribution, 390; key, 551: anglica, anti- 



costensis, elegans, exornata, filitexta, foriolus, 



gibba, mercerensis, procera, quadrata, robusta, 



rugeri, squamosa. 

 Pleurocystis sp., 8. 



podia, possible, in Cothurnocystis, 229, 230. 

 polymerism of stem, 584. 

 Pomeroy, 466. 

 pore-rhombs, distribution in Glyptocystidea, tf. 



45. 

 primitius, Pi/ocystites, 589. 

 "proboscis," Dendrocystis, 69. 

 procera, Pleurocystis, 377, 390, J^86, 534, 551, 552, 



577, PL V. f. 63, tf. 72. 

 Protocystites sp., 8 (footnote). 

 Prunoctjstis, 269, 281, 357. 

 Pseudocrinus, 269, 275, 281 ; relation to sea-floor, 



595 : quadrifasciatUs. 

 Pulkowa, 288. 

 pyramidal is, Anomalocystites, 26, 28. 



quadrata, Pleurocystis, 378, 380, 382, 383, 390, 

 499, 501, 534, 550, 551, 552, 553, 577, 609, 

 PI vi. ff. 69-74, tf. 73, 79. 



quadrifasciatus, Pseudocrinus, 275. 



Quarrel Hill beds, 467. 



Quebec, 42, 156. 



" radiate ridges," 402. 



radiatus, Cheirocrinus, 294, 295, 296, 299, 307, 



308, tf. 42. 

 Rafinesquina : siluriana. 

 Eamsay, a. C, 615. 

 " ratio plate 5," Pleurocystis, 397. 

 ratio, thecal, Pleurocystis, 396, 552. 

 Raymond, P. E., 406. 

 (NO. 6). 69 



