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INDEX. 



Orthoceras tenuicinctum 



tenuistriatum .. 



textile .. 



Thompsoni 



■ torquatum 



tracheale 



— truncatum 



tubicinella 



tumidum 



— undulatum 



undulocinctum . . 



undulosostriatum 



vagans . . 



vaginatum 



velatum . . 



ventricosum 



vertebrale 



virgatum 



xit 



Phillips 

 Phragmoceras 



arcuatum 



Brateri .. 



■ compressum 



■ externum 

 imbricatum 



■ incequiseptum 

 intermedium 

 nautilaceum 



■ obliquum .. 



■ prius 



■ pyriforme 



■ range of 



■ subexternum 



■ ventricosum 



Piloceras 



invaginatum . 



Portlock 

 Poterioceras . . 



approximatum 



ellipticum 



intortum 



range of 



Quenstedt's divisions of Nautilus 

 Orthoceras 



Padiati 



Begulares 



Kespiratory system of Nautilus 



PAGE 



. 119 

 . 128 

 . 125 

 . 158 

 . 148 

 97, 228 

 . 151 



85 

 . 123 



89 

 . 120 



83 

 . 140 

 . 164 



87 

 . 148 



98 

 . 106 



80 



71 



59 



170, 179, 204 

 . 170 

 77,216 

 . 206 

 . 202 

 . 170 

 . 179 

 181, 232 

 203 

 199 

 190, 192 

 59 

 . 204 

 . 200 

 54, 156 

 . 176 

 69 

 57, 186 

 . 186 

 . 190 

 . 187 

 .. 57 



63 

 50 



. 63, 64 

 50 

 13 



Salter 

 Sedgwick 

 Septa, bands on 



distance of 



general direction of 



mineral deposits in 



of Nautilus 



70, 71, 72, 73, 74, 75, 76, 77 



70, 71, 72, 73 



40 



30 



30 



33 



19,30 



Septa, shape of 



truncation of . . 



Sharpe 



Shells of Nautiloids 



, commencement of 



, internal marks on 



, structure of .. 



Simplices 



Sinuosi 



Siphuncle of Nautiloids 



, functions of . . 



, size of .. 



, structure of .. 



Sollas 



Sowerby 



Spadix of Nautilus .. 



Species, nature of .. 



Spirales 



Spirulites .. .. 



Stenoceras 



Striati .. 



Strickland 



Sycoceras 



Temnodiscus .. 



Tetrabranchiata defined 



Trernatoceras .. 



Trematodiscus 



Tretoceras 



■ — — bisiphonatum .. 



semipartitum .. 



Trigonoceras .. 

 Trochoceras .. 

 arietinum 



■ asperum 



• cinereum 

 comu-arietis 

 giganteum 



■ gyrans . . 

 oxynotum 



■ pingue . . 

 i rapax 



■ regulare 



■ remotum 



■ speciosum 



■ striatum 



■ tortuosum 



■ undosum 



Trocholites 



anguiformis 



planorbiformis 



scoticus .. 



Truncation of septa 



Undulati 

 Vaginati 

 Wyatt-Edgell 



46, 



31 



35 

 70 

 17 

 24 

 40 

 17 



63,64 



64 



36 



39 



37 



37 



78 



69 



8 



239 



62, 210 



65 



48 



63,64 

 72 

 58 



62 

 4 



48 



62 

 48,52 

 164 

 125 

 54, 56 

 65, 215 

 227 

 218 

 215 

 217 

 223 

 220 

 221 

 235 

 225 

 221 

 215 

 219 

 222 

 221 

 226 

 62,64 

 213 

 213 

 215 



35 



50,63 

 50 

 75 



LONDON : PKINTED BY WILLIAM CLOWES AND SONS, LIMITED, STAMFORD STREET AND CHARING CROSS. 



