£;XPLANATIOiN OF PLATE 44. 66 



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

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

 of York, (Original.) 



Fig. 8^ Transverse septum of Fig. 8, shewing 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, shewing the 

 siphuncle, on the back, between the spines. 



Fig. 11. Hamites from Folkstone Clay, shewing 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, shewing the Siphuncle 

 at a. The removal of the outer shell shews the 

 sinuous edges of the transverse Plates beneath the 

 Ribs. (Original.) 



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

 Green Sand at Earl Stoke, shewing the Siphuncle 

 (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. <z. ; 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, shewing its lobes and saddles to be analo- 

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



GROL. ir. F 



