INDEX. 



In this index black-face figures refer to locality numbers, light-face figures refer to pages. The main refer- 

 ence to each genus and species (the page reference "which is usually put in black-face type under the old scheme 

 of lumping all references together, or the page reference which will be used in the future synonymy of the genus or 

 species) is given first and is invariably preceded by the word "described," even if the genus or species is little more 

 than mentioned on the page given. 



References to the description of certain features of a species or to comparisons with other species are indexed only 

 if the description or comparison occurs on some other page than the one on which the species is described. 



The table of synonymic references, on pages 27-98, may be regarded as a completely cross-re'ferenced index to the 

 synonymy in the monograph, as each name in that table is there given in the form in which it appears in the sjmonymy 

 of the species to which it is now referred. This index therefore includes only those synonymic references that appear 

 in connection with the description of the genera and species, all synonyms being placed in quotation marks. 



This index gives the numbers of all the localities in any country, province, State, county, district, or place, as 

 "well as the numbers of all the localities identified from the different formations or other stratigraphic units. These 

 numbers are tabulated on pages 160-291, where full information is given as to species included, authority for 

 citation, correlation and comparison with other localities, and the stratigraphic section (pp. 123-159) in which the 

 locality is placed or with which it is coirelated. For these reasons this index includes no reference to the localities 

 given in connection with the description of the species. The names of species given under the heading "Locali- 

 ties," on pages 160-291, are not indexed as appearing on those pages, but the page on which each brachiopod there 

 named is described appears in the index, and on this page are given not only the numbers but detailed descriptions 

 of all localities from which the species has been identified. 



Geographic names that have been passed on by the United States Geographic Board are spelled in accordance 

 ■with that board's decisions, but a few variant familiar spellings have been inserted in the index with cross references. 



Abe Lincoln mine, near Pioche, Nevada, locality at 3 



Abington quadrangle, Massachusetts, locality in 321 



Ableman, "Wisconsin, locality at 321 



ahnormis , see Huendla. 



Abrigo limestone (Middle Cambrian)^ locality in 1 



Acadian, generalized section of,listing species and localities 132-1 



acadicus, see Obolus, 



Acerocare zone, in generalized section for Sweden, Denmark, Fin- 

 land, and Norway, listing species and localities 1 



locality in 30 



Acknowledgments 



(AcTiiis),see Oholus (Acritis). 



Acrothele, described 6 



cardinal area discussed 3 



classification of 321, 3 



compared with Acrothele (Redlichella) 662, 6 



Acrotreta 3 



Acrotrcta and Acrothyra 3 



Acrotreta definita 6 



Acrotreta gemmula € 



Botsfordia 601, 6 



Discinopsis gulielmi 7 



" Linnarssonia" 6 



Schizopholis 60S, 6 



Yorkia 6 



■development of 3 



distortion of shells of 6 



evolution discussed 3 



evolution of 3 



general geographic and stratigraphic distribution of the 



species referred to 1 



general stratigraphic distribution and number of Cam- 

 brian species and varieties of 1 



mentioned 656, 661, 6 



number of Ordovician species and varieties of 1 



number of species of, in the different types of sedi- 

 ment 1 



Acrothele— Contmned. 



pedicle tube discussed 314 



reference to, of Acrothele nitida discussed 651 



reference to, of Acrothele pretiosa discussed 705 



reference to, of Acrotreta inchoans discusGcd 690 



reference to, of Acrotrcta ? minima discussed 695 



species of, grouped under surface characters 632-633 



surface ornamentation discussed 301, 302 



type species Acrothele coriacea 632 



vascular markings discussed 311 



"abavia", discussed 635 



artemis, described 634 



general geographic and stratigraphic distribution tabu- 

 lated 105 



type specimen figured text fig. 54, 634 



avia, described 634 



compared with Acrothele avia puteis 636 



Acrothele proles 654, 655 



general geographic and stratigraphic distribution tabu- 

 lated 105 



in group based on surface characteristics 632 



surface ornamentation discussed 302 



type specimen figured PI. LXI, fig. 7a 



avia puteis, described 63S 



general geographic and stratigraphic distribution 



tabulated 105 



in group based on surface characteristics 632 



tyT)e specimen not figured. 



"barbata," described and discussed 640 



'.7ti, described 636 



compared with Botsfordia pulchra 633 



Micromitra (Tphidella) pannuli. 633 



general geographic and stratigraphic distribution 



tabulated 105 



stratigraphic position mentioned 318 



surface ornamentation discussed 302 



type specimen figured PI. LVII, fig. 3 



811 



