EXPLANATION OF PLATES. 309 



FIG. 



470. Conilites pyramidatus, (from Blainville.) 



Fam. Lituacea. 



471. Spirula Peronii. 



Fain. Nautilacea. 



472. Nummulites buticularis, outside. Helicites, Bl. Camerina, 



Brookes. 



473. The same inside, to shew the chambers. 



474. Nautilus pompilius, young. See Frontispiece. 



475. Simplegas sulcata. 



476. Endosiphonites. (from Camb. Philos. Trans.) 



Fam. Ammonacea. 



477. Ammonoceras. (from Blainville.) 



478. Ammonites ; a, break in the shell, showing the sinuous septa. 



479. Orbulites crassus. Globulites, Nonnul. Angulites, Montf. 



reduced. 

 479*. discus. Aganides, Montf. 



480. Goniatites striatus. 



481. Scaphites sequalis. 



482. Crioceratites Duvallii. 



483. Turrilites tuberculatus. 



484. Baculites Faujasii. Portion near the centre. 



484*. Hamites cylindricus ; a, internal cast of part of the shell ; 

 b, hollow external cast of the remainder. 



Second Division. Monothalamous Cephalopoda. 



485. Argonauta Argo. 



486. Bellerophon tenuifasciata. (from Sow. Gen.) 



487. The same, shewing the dorsal keel. 



Order. Heteropoda. 



488. Carinaria Mediterranea. 



