826 



CAMBRIAN BRACHIOPODA. 



Dicellomus — Continued. 



general stratigraphio distribution and number of Cam- 

 brian species and varieties of HO 



muscle sears discussed 312 



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



pedicle semitube discussed 314 



surface ornamentation discussed 302 



type species "Lingula polita" 572 



vascular markings discussed 311 



appalachia, described ^'-^ 



compared witli Dicellomus politus 577 



Dicellomus sp. undt 578 



general geographic and stratigraphic distribution tabu- 

 lated 103 



type specimen figured PI- LIII, fig.-la 



Tianus, described 57o 



compared with Dicellomus appalachia 572 



Dicellomus pectenoides 575 



Dicellomus politus 577 



general geographic and stratigraphic distribution tabu- 

 lated 103 



stratigraphic position of type specimen discussed 574 



type specimen figured PI- LUI, fig. 2 



parvus, described 574 



general geographic and stratigraphicdistribution tabu- 

 lated 103 



type specimen figured PI- LXXXIX, fig. lib 



5, described 575 



compared with Dicellomus politus -- 577 



general geographic and stratigraphic distribution tab- 

 ulated 103 



type specimen (?) figured PI- LII, fig.^6 



politus, described r 575 



compared with Curlicia elegantula 3G9, 370 



Dicellomus appalachia 572 



Dicellomus nanus 573 



Dicellomus parvus 574 



Dicellomus pectenoides 575 



Dicellomus proliftcus 578 



Lingulella phaov. 525 



Obolella chromatica 572 



Obolus sinoe "IIG 



Obolusf sp. undt. f 423 



Obolus (Fordinia) gilberti 429 



Obolus (IT'es(emia) aurora 452 



discussed 572 



general geographic and stratigraphic distribution tabu- 

 lated 103 



intermediate between Obolus and Obolella 314 



type specimen not figured. 



prolificus, described 578 



general geographic and stratigraphic distribution tabu- 

 lated 103 



type specimen figured PI- LXXXIX, fig. 10 



sp. undt., described 578 



general geographic and stratigraphic distribution tabu- 

 lated 1 03 



tjnpe specimen figured PI. LII, figs. 7 and 7a 



dichotoma, see Acrothele. 



Dickinson County, Michigan, locality in 330b 



Dictyograptus slate (Upper Cambrian), in generalized section for 



Eussia 143 



in generalized section for Sweden, Deiunark, Finland, and 



Norway, listing species and localities 145 



locaUties"in 309b,310t-v,321x,390g 



systemic reference discussed 98 



Dictyograptus flabclliformis zone (Upper Cambrian), locality in. . .. 309h 



Dictyograptus zone, mentioned 515 



Dictyonema zone, in generalized section for Cape Breton, listing 



included and correlated species and localities 131 



mentioned 4S7 



Diductor muscles, defined 293 



Didymograptus slate, in generalized section for Sweden, Denmark, 



Finland, and Norway 144 



Dikellocephalus [Olenus] fauna, mentioned 378 



Dlnobolus, classification 310 



Hall and Clarke on development of 309 



platform mentioned 309 



Dinorthis, classification of, by Uhich 308 



compared with Hebcrtella 320 



Protorthis ( Loperia) dugaldensis 3?0 



Dmorf/iis— Continued. 



cruralium mentioned 309 



muscle scars of, discussed by Ulrich 308 



no Cambrian representatives 320 



subquadrata, cardinal process discussed 306 



Discina, compared with Discinolepis 664 



mentioned 532 



reference to, of Orbiculoidea contraria discussed 722 



reference to, of Orbiculoidea variant discussed 723 



"csKrfaie.nsis," discussed 723 



"pileolus, ' ' discussed 647, 723 



Discinacea, classification of 321, 325 



distribution in Cambrian strata 316 



genera and species referred to, described 722-723 



Discinella, association mentioned 357 



Discinida?, classification of 321, 325 



distribution in Cambrian strata 316 



genera and species referred to, described 722-723 



general stratigraphic distribution and number of Cambrian 



genera and species of 112 



number of Cambrian genera and species of 112 



number of genera and species in monograph 113 



Discinisca, compared with Discinolepis 664 



Discinolepis, described 664 



cardinal area discussed 305 



classification of 321, 324 



evolution of 317 



general geographic and stratigraphic distribution of 



the species referred to 105 



general stratigraphic distribution and number of Cam- 

 brian species and varieties of Ill 



intermediate between Acrothele and A crotreta 314 



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



type species Discinolepis granulata 664 



gronulata, described 664 



general geographic and stratigraphic distribution 



tabulated 1 05 



type of Discinolepis 664 



type specimen figured PI. LXXXI, fig. 3 



Discinopsis, described 720 



classification of 321, 324 



compared with A crothyra 721 



Dearbornia 614 



Yorkia 611 



evolution discussed 319 



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 different tjTies of sediment 160 



reference to, of Discinopsis? sulcatus discussed 721 



type species Acrotrctaf guUelmi 720 



vascular markings discussed 311 



guliclmi, described 720 



compared vfithDiscinopsisf sulcata 721 



general geographic and strati.graphic distribution 



tabulated 107 



type specimen figured PI. LXXXII, fig. 5 



? sulcatus, described 721 



general geographic and stratigraphic distribution tab- 

 ulated 107 



type specimen figured PI. LXXXII, fig. 6 



discoidcus, see Obolus. 

 dimricator. see Lucinia. 



Division Clbl of Matthew (Middle Cambrian), in generalized sec- 

 tion for Cape Breton, listing included speoiesandlocalities. 133 



localitiesin - 2f, 2g, 3011, 308eT 



Division Clb2 of Matthew (Middle Cambrian), in generalized sec- 

 tion for Cape B reton .Listing included species and localities . 133 



locality in ^"^^ 



Division Clb3 of Matthew (Middle Cambrian), in generalized sec- 

 tion forCapeBreton,listingincludedspeciesandlocalities. 132 



localitiesin : 2i, 2k, 301a, 308d, SOSgT 



Division Clb4 of Matthew (Middle Cambrian), in generalized sec- 

 tion for Cape Breton, listing included species and localities . 132 



localiUesin 308d, 308g? 



Division Clb5 of Matthew (Middle Cambrian), in generalized sec- 

 tion forCape Breton, listingincludedspeciesand localities. 132 

 localitiesin 301b, 301d, 301f 



