INDEX TO GENERA AND SPECIES. 



491 



Ammonites striatulus, Sowcrby ; see Harpoceras striatulum 

 striatus, Zieten ; see Aegoceras striatum 



subarmatus, Young and Bird ; see Stephanoceras subarmatum 

 subcarinutus, Phillips ; see Phylloceras subcarinatum 

 submuticus, Oppel ; see Aegoceras submuticum 

 subnodosus, Young and Bird ; see Arietites subnodosus 

 subplanatus, Dumortier ; see Harpoceras exaratum 

 sulcatus, Simpson ; see Aegoceras Charmassei 

 Tuylori, Sowerby ; see Aegoceras 'I'aylori 



,, costatus, Quenstedt ; see Aegoceras Taylori 

 „ nodosus, Quenstedt ; see Aegoceras Taylori 

 tenellus, Simpson ; see Arietites Collenotii 

 tenuicostatus, Young and Bird ; see Lytoceras lineatum 

 Terverii, d'Orbigny ; see Phylloceras heterophyllum 

 Thouarsensis, d'Orbigny ; see Harpoceras striatulum 

 tortilis, d'Orbigny ; see Aegoceras laqueolus . 

 torulosus, Schiibler ; see Lytoceras hircinum . 

 torus, d'Orbigny ; see Aegoceras Johnstonii 

 transformatus, Simpson ; see Arietites Sauzeanus 

 trapezoidalis, Sowerby ; see Aegoceras catenatum 

 Turneri, Sowerby ; see Arietites Turneri 

 Valdani, d'Orbigny ; see Aegoceras Valdani . 

 variabilis, d'Orbigny ; see Harpoceras variabile 

 Walcotti, Sowerby ; see Harpoceras bifrons . 

 Zetes, Studer ; see Phylloceras Zetes 

 Ziphus, Zieten ; see Aegoceras planicosta 

 Argonauta Ccecilia, Reinecke ; see Harpoceras serpentinum 



,, serpentinus, Reinecke ; see Harpoceras serpentinum 



Auietites, Waagen .... 



bisulcatus, Bruguiere, pis. iii and iv . 



Bonnardii, d'Orbigny, pi. xi, figs. 1 — 3 



Brooki, Sowerby, pi. vi, figs. 4, 5 . 



Bucklandi, Sowerby, pi. i, figs. 1 — 3 



Collenotii, d'Orbigny, pi. vi, fig. 1 •} pi. xxiiA, figs, 6 — 9 ; pi. xxiiB, 



Conybeari, Sowerby. pi. ii, figs. 1 — 3 



Crossii, Wright, pi. x, figs. 1,2 



impendens, Young and Bird, pi. xxiiA, figs. 1 — 5 



nodotianus, d'Orbigny, pi. xxxvii, figs. 3, 4 



obesulus, Tate and Blake, see Arietites subnodosus 



obtusus, Sowerby, pi. xxi, figs. 1 — 5 . 



raricostatus, Zieten, pi. vii, figs. 2 — 6 ; pi. xxvi, figs. 5 — 14 



rotiformis, Sowerby, pi. v, figs. 1 — 4 ; pi. vii, fig. 1 ; pi. ix, figs. 1- 



Sauzeanus, d'Orbigny, pi. viii, figs. 1 — 6 



Scipionianus, d'Orbigny, pi. xiii, figs. 1 — 3 ; pi. xix, figs. 8 — 10 



figs. 1—3 



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1 Named Arietites denotatus on explanation of pi. vi. 



