EXPLANATION OF PLATE 44. 65 



Fig. 8. Hamites Bucklandi, (Phillips,) from the Gault or 

 Speeton Clay, in the collection of Mr. I. Phillips, of 

 York. (Original.) 



Fig. 8 a . Transverse septum of Fig. 8, showing the lobes 

 and saddles, and the siphuncle at a. 



Fig. 9. Hamites armatus, from the upper Green Sand, 

 near Benson. (Sowerby.) 



Fig. 10. Transverse section of the same, showing the 

 siphuncle, on the back, between the spines. 



Fig. 11. Hamites from Folkstone Clay, showing the spiral 

 Ribs of the outer shell. At a. we see the Siphuncle, 

 and the lobes and saddles of the transverse Plate. 



Fig. 12. Fragment of the cast of the interior of another 

 Hamite from Folkstone Clay, showing the Siphuncle 

 at a. The removal of the outer shell shows the sinu- 

 ous edges of the transverse Plates beneath the Ribs. 

 (Original.) 



Fig. 13. Fragment of Hamites articulatus (Sow.) from 

 the Green Sand at Earl Stoke, showing the Si- 

 phuncle (a.) covered by a small portion of the shell. 

 The sinuous terminations of the transverse plates 

 are visible beneath the ribs, having their secondary 

 lobes rounded outwards (b.) and pointed inwards 

 (c.) like the secondary lobes of Ammonites. (Ori- 

 ginal.) 



Fig. 14. Fragment of Turrilites Bergeri, in the collection 

 of G. B. Greenough, Esq. from the Green Sand for- 

 mation. The siphuncle is seen near the upper or 

 dorsal margin of two whorls at a. a. ; the sinuous 

 edges of the transverse plates are visible on the 

 middle whorl ; and the entire surface of a transverse 

 plate is laid open at the smaller end of a third 

 whorl, showing its lobes and saddles to be analo- 

 gous to the same parts in Ammonites. (Original.) 

 6* 



