260 



INDEX 



decipiens (Isorthis), 150 

 decussata (Virgiana), 185 

 deflecta (Valcourea), 7, 97 

 deflexa (Anastrophia), 170 

 deformatus (Porambonites), 102, 103 

 deformis (Stricklandia), 187 

 Deltarium, 7 



Deltatreta, 17, 21, 22, 23, 24, 38, 107, 108 

 Deltatretida:, 48, 107 

 Delthyrial cavity, 7 

 Delthyrium, 7, 21, 163 

 Deltidial cover, 163 

 plates, 7, 163 



Deltidium, 7, 21 



demissa (Nicolella), 77 



Dental plates, 7, 2 5, 42 

 sockets, 8, 34, 35* 



dentata (Platystrophia), 66, 68 



Denticles, 8, 34, 35* 



Derby, O. A., 39, 145 



deshayesi (Mystrophora), 131 



desmopleura (? Eoorthis), 51 



desmopleura nympha, see nympha 



diablo (? Eoorthis), 51 



dice (Deltatreta), 108, 109 



DiCTYONELLA, 102 



Diductor muscles, 8, 30, 31, 32, 33,* 40 

 dieneri (Parenteletes), 147, 148 

 Dietrich, W. O., 67 

 dimera (Bilobites), 130 

 diminutiva (Rhipidomella), 133 

 Dinorthida, 35, 37,44,93 

 DiNORTHis, 10, 18, 21, 31, 35, 36, 93, 94 

 carletona, see Pionorthis 

 carleyi insolens, see Retrorsirostra 

 Columbia, see PL-esiomys 

 deflecta, see Valcourea 

 iphigenia, see Plaesiomys 

 loricula, see Valcourea 

 meedsi, see Plaesiomys 



arctica, see Plaesiomys 

 germana, see Plssiomys 

 platys, see Multicostella 

 recta, see Valcourea 

 retrorsa, see Retrorsirostra 

 retrostriata, see Heterorthis 

 rockymontana, see Plaesiomys 

 subquadrata, see Plaesiomys 

 tioga, see Cariniferella 

 transversa, see Plaesiomys 

 ulrichi, see Plaesiomys 

 discus (Rhipidomella), 133 

 disparilis (Hesperorthis), 86 

 divergens Foerste (Pentamerus), 178 

 divergens Hall and Clarke (Parastrophinella), 169 

 diversa (Vellamo), 114 

 dixoni (Orthostrophia), 71 

 DoLERoiDEs, 17, 36, 58, 63 



DOLERORTHIS, 40, 74, 88 



dolomitica (Orthotropia), 152 



dorsata (Platystrophia), 66 



dorsoplicata (Fascicostella), 130 



dougaldensis (Loperia), 47 



dubiaHall 1860 (Pentamerella), 176 



dubia Hall 1858 (Perditocardina), 83, 13S 



dudleyensis (Gypidula), 174 

 dumblei (Enteletes), 146 

 dumonti (Cariniferella), 122 



edgelliana (Idiorthis), 128 

 edgewoodensis (Wattsella), 125 

 Eichwald, E., 103 

 eifelensis (Aulacella), 122 

 electra (Archseorthis) , 80, 81, 109 

 Ixvis (Archseorthis), 81 

 major (Archsorthis), 81 

 elegans (Enteletes), 146 

 elegantula Butts (Paurorthis), 80, 109 

 elegantula Dalman (Parmorthis), 128, 130 

 elegantula McEwan (Platystrophia), 65 

 amplisulcata (Platystrophia), 65 

 triplicata (Platystrophia), 65 

 elegantula Walcott (Eostrophomena), 85 

 elkhornensis (Platystrophia), 65 

 EUes, Gertrude, 1 3 

 ellipsoides (Heterorthina), 124 

 ellsworthi (Rhipidomella), 133 

 elmira (Cariniferella), 122 

 elongata Willard (Multicostella), 98 

 emacerata (Dalmanella), 32, 120, 121 

 emarginata Belanski (Sieberella), 175 

 emarginata Hall (Rhipidomella), 133, 134 

 emarginata Pahlen (Vellamo) ,114 

 eminens (Orthis), 76 

 eminens (Productorthis), 83 

 Encuclodema, see Cycloccelia 

 Endopunctse, 10, 42 

 Enteletella, 145, 146, 148, 162 

 Enteletes, 19, 30, 38, 140, 146, 149, 162 

 acutiplicata, see Enteletina 

 choristites, see lamarcki 

 dieneri, see Parenteletes 

 ferruginea, see Enteletina 

 globosa, see Enteletina 

 infracarbonica, see Aulacophoria 

 latesinuata, see Enteletina 

 pentameroides, see Enteletina 

 sublxvis, see Enteletina 

 uralica, see Aulacophoria 

 Enteletina, 146, 148 

 Enteletina, 31, 140, 141, 145 

 Enteletoides, 146, 147, 148 

 Eoorthids, 44, 50, 74 

 Eoorthis, 27, 37, 50, 51 



bavarica, see Archxorthis 

 christianiae, see Archsorthis 

 daunus, see Archaeorthis 

 desmopleura nympha, see nympha 

 hastingsensis, see Protorthis 

 johannensis, see Orusia 

 newtonensis, see Finkelnburgia 

 putillus, see Archaeorthis 

 remnicha sulcata, see sulcata 

 texana, see texana 

 winfieldensis, see winfieldensis 

 tuUbergi, see Archsorthis 

 wimani, see Archseorthis 

 Eostrophomena, 85 

 Epidermis, 41 

 erecta (? Nisusia), 45 



