862 



CAMBRIAN BRACIIIOPODA. 



Protorihis, described 738 



cardinal process discussed 306 



classification of 321, 325 



compared with Protorthis (^Loperia) dugaldensis 744, 745 



dental plates discussed 311 



evolution discussed 320 



evolution of 317 



general geographic and stratigraphic distribution ot 



the species referred to 107 



general stratigraphic distribution and number of Cam- 

 brian species and varieties of Ill 



muscle scars discussed 313 



number of species of, in different types of sediment. . . 160 



presence at Hastings Cove, mentioned 779 



reference to, of Nisusia (Jamesella) spencei discussed . 737 



reference to, of Protorthis hunnehergensis discussed 741 



reference to, of Protorthis latourensis discussed 742 



spondylium discussed 307 



stratigraphic position mentioned 320 



Ulrich on spondylium in 308 



vascular markings not preserved 311 



billingsi, described 739 



compared with Protorthis latourensii 742 



Protorthis quacoensis 743 



Protorthis wingi 743 



general geographic and stratigraphic distribution tabu- 

 lated 107 



type specimen not figured. 



helerta, described 740 



general geographic and stratigraphic distribution tabu- 

 lated 107 



type specimen figured PI- XCIX, fig. 4 



? hunnebcrgensis, described 740 



general geographic and stratigraphic distribution tabu- 

 lated 107 



type specimen figured PI- XCV, fig. 5a 



Ise^is, described 741 



general geographic and stratigraphic distribution tabu- 

 lated 107 



type specimen figured PI- XCIX, figs. 6, 6a^b 



latourensis, described 741 



compared with Protorthis helem 740 



general geographic and stratigraphic distribution tabu- 

 lated 107 



type specimen not figured. 



, described 742 



compared with Protorihis sp. undt 744 



general geographic and stratigraphic distribution tabu- 

 lated 107 



muscle scars discussed 313 



type specimen fig\ired PI- XCIX, fig. 2b 



wingi, described 743 



general geographic and stratigraphic distribution tabu- 

 lated 107 



type specimen figured PI- XCIII, fig. 5a 



sp. undt., described 743 



general geographic and stratigrapliic distribution tabu- 

 lated 107 



type specimen not figured. 



Protorthis (,Loperia), described 744 



classification of 321, 325 



evolution of 317 



general geographic and stratigraphic distribution of 



the species referred to 107 



general stratigraphic distribution and number of Cam- 

 brian species and varieties of Ill 



number of species of, in diflerent types of sediment . . 160 



stratigraphic position mentioned 320 



type species Protorthis (Loperia) dugaldensis 744 



dugaldensis, described 744 



compared with Dinorthis 320 



general geographic and stratigraphic distribution 



tabulated 107 



type of Protorthis (^Loperia) 744 



type specimen figured PI. XCIX, fig. 5 



Protosiphon, discussed 616, 619, 620 



Protractor muscles, defined 295 



Protremata, articulating processes discussed 307 



cardinal area discussed 305 



Pro tremata— Continued . 



classification of 321,325 



defined 295 



dental plates discussed 310-311 



distribution in Cambrian strata 316 



evolution of genera of, discussed 319-320 



holoperipheral growth of deltidimn in 306 



muscle scars discussed 313 



pedicle opening absent in all Cambrian genera except Bil- 



lingsclla 315 



pedicle tube discussed 315 



pseudospondylium in 307-308 



spondylium discussed 307-308 



surface ornamentation discussed 302 



vascular markings discussed 311-312 



Protremata (Ordovician) shell structure compared with that of 



Cambrian eoorthoids and BillingsellidEe 300 



Provo, Utah, locality near 7w 



Prussia, Cambrian species ot, listed 120-121 



See also East and West Prussia. 



Prussian Holland , East Prussia, locali ty near 386a- 



Pseudo-area, defined 295 



Pseudochilidium, defined 295 



discussed 306- 



Pseudocruralium, defined 295 



Pseudodeltidium, compared with deltidium 306 



defined 295 



discussed 303-305 



Pseudopedicle groove, defined 295 



Pseudospondylium, defined 295 



Pskow, Russia, locality in 336p 



Ptychoparia, association mentioned 349 



mentioned 501 



kingi, association mentioned 658 



minuta, association mentioned 527 



robbi, association mentioned 498 



variolaris, association mentioned 49S 



pulchra, see Botsfordia. 



Pulkowa, near St. Petersburg, Russia, locaUties at 336e, 396 1 



Pulkowa Brook, near St. Petersburg, Russia, locality on 395y 



Pulpit Rock,Nahant, Massachusetts, locality at 326c 



pumila, see Lingulella (Lingulepis). 



Pumpelly, Raphael, species named for 761 



pumpellyi, see Billingsella, 

 punctata, see Lingulella. 



Punta Pintau, Sardinia, locaUties at 354b, 354o, 354f 



pusilla, see Micromitra. 

 Putalova, see Podolova. 

 putcis, see Acrothele avia. 



Puxley Park Lane, Atherstone, England, locaUty on 304] 



pygmsea, see Lingulella (Lingidepis). 

 pyxidicula, see Acrotretu. 

 quacoensis, see Protorthis. 

 quadrilateralis, see Lingulella. 

 quadrilincata, see Acrothele. 



Quebec, Cambrian species of, listed 114-119 



localities near 66a, 56b, 319c, 319h, 3191, 



Quebec (Province), Canada, locaUties in .. . 2n-p, 2r, 220a, 319, 319a-d, 

 319i, 319ll-pl, 319t, 319u, 392?, 392g-j, 392m, 392n? 



note on stratigraphic position o£ localities in 143 



" Quebec group " (Lower Ordowian), locaUties in 314d, 392] 



mentioned 517 



See also Division P of BiUmgs. 



Quebecia, described - 609 



cardinal area discussed 305 



classification of 321, 324 



compared with Acroireta 611 



Obolclla 611 



Yorlia 611 



evolution discussed 319 



evolution of 317 



general geographic and stratigraphic distribution of 



the species referred to 104 



general stratigraphic distribution and number ot Cam- 

 brian species and varieties ot HO 



number of species of, in different types of sediment ... 160 



shell substance 297 



stratigraphic position mentioned 31S 



type species " Obolella circe" 610 •- 



