INDEX 



The majority of the species listed in this index are not discussed in the memoir, but merely cited in the species 

 lists to which the page number refers. Pages on which species or genera are discussed are in bold-face type. All 

 species are listed under the specific name ; in addition, species whose generic reference has been changed are listed 

 under the genus to which they were formerly referred. Synonyms are in italics. Asterisks signify illustrations. 



abnorinis (Hucnella), 159, 160* 

 abscissa (Panderina), 81 

 actonia: (Nicolella), 77, 78 

 aculeatus (Productorthis), 82 

 acuminata (Platystrophia), 65 

 acutilirata (Platystrophia), 65, 66 



prolongata (Platjstrophia), 65 

 acutilobus (Bilobites), 130 

 acutiplicata Reed (Porambonites), 102 

 acutiplicata Waagcn (Enteletina), 148 

 acutolobatus (Gypidula), 174 



procerula (Gypidula), 174 

 acutum (Cymbidium), 183, 184* 

 Adductor muscles, 6, 30, 31, 33,* 39, 40* 

 Adjuster muscles, 6, 30, 31, 33* 

 adscendens Davidson (V'ellamo), 114 

 adscendens Pander (Clitambonites), 26, 113 

 iqualis (Hemipronites), 116 

 xqualis (Orthis), 76 

 «equirostris (Porambonites), 102, 104 

 aKjuivalvis Hall (Plectorthis), 58 



latior (Plectorthis), 58 



pcrvagata (Plectorthis), 58 

 aquivdvis Shaler, see Mendacella uberis 

 agilera (Nicolella), 77 

 alaskensis (Brooksina), 183 

 alberta (Nisusia), 45 

 alsa (Rhipidomella), 133 

 altaica (Rhipidomella), 134 

 alternata (Heterorthis), 137 

 altirostris (Rhipidomella), 133 

 altissimus (Clitambonites), 114 

 altus (Clitambonites), 113 

 altus (Hemipronites), 116 

 altus (Porambonites), 102 

 alveata (Hebertella), 60 



richmondensis (Hebertella), 60 

 ambigua ("Camerella"), 168 

 americana (Vcllamo), 114 

 amii {'. Nisusia), 45 

 amocna (Plat}strophia), 65 



longicardinalis (Platj'strophia), 65 

 Anastrophia, 162, 164, 167, 169 

 ancillans (Clorinda), 172 

 andii (Enteletes), 146 

 angulata (Gypidula), 174 

 Ancusticardima, 69, 84 

 Angusticardiniina:, 74, 84 

 annamitica (Dinorlhis), 94 

 annieana (Platystrophia), 65 

 anomala Schlotheim (Clinambon), 115 



anomala Walcott (Wimanella), 50 



anthonensis (Skcnidioides), 72, 73 



anticosticnsis Billings (Stricklandia), 187 



anticosticnsis Shaler (Plaesiomys), 94 



anticosticnsis Twenhofel (Virgiana), 185 



antiquata (Swantonia), 159 



aperturata (Platystrophia), 66 



Apical plates, 6, 22 



apicalis Billings (Hesperorthis), 86 



apicalis Whitfield (Pohtoechia), 110 



Apomatella, 24, 107, 117 



appalachia (Billingsella), 49 



arachne (? Syntrophia), 188 



arata (Pentamerella), 176 



Arch.€;orthis, 21, 26, 74, 80 



arcticum (Conchidium), 181 



arcuaria (Isorthis), 150 



areola (Mystrophora), 22, 131, 132* 



arethusa (? Syntrophia), 188 



arisaigensis (Mendacella), 127 



arkansana (Rhipidomella), 133 



armanda (Finkelnburgia), 5 5 



armata (Clorinda), 171 



Articulation, 6, 24 



assimilis (Rhipidomella), 133 



asteroidca (Nicolella), 77 



atava (Orusia), 54 



atavoides (Dinorthis), 94 



Athyris (?) tumidula, see Clorinda 



Atr}-pa dorsata, see Platystrophia 



galeata, see Gypidula 



lens, see Stricklandia 



nucella, see Lycophoria 

 attenuata (Platystrophia), 65 

 AULACELLA, 19, 119, 122, 136 



AULACOPHORIA, 141, 145, 147 



aurora (Eostrophoniena), 8 5 



AUSTINELLA, 94, 99 



avelinei (Dalmanella), 120 

 avita (Idiorthis), 128 



Baker, F. C, 1 1 



balclatchiensis (Glyptorthis), 90 



balclatchiensis (Mctacamerella), 170 



Bancroft, B. B., 96, 138 



Barrande, J., 177 



barrandei Billings (Virgiana), 185, 186* 



barrandei Schuchcrt and Cooper (Heterorthis), 138 



Barrandei-la, 162, 163, 165, 166, 171, 173 



Barrandina, see Clorinda, 172 



basalis (Parmorthis), 129 



