50SSIL FAUNA. 141 



PLATE LXI. 



Fossil Cephalopoda, &c. 



Fig. 1. Part of the cast of a species of Hamite {Hamites intermedius, of Sowerby), from the 

 Gait of Folkstone. The name Hamites was employed by Mr. Parkinson to designate 

 a genus of chambered shells, in which the direction of the spire, instead of being 

 straight, as in Baculites, or discoidal, as in Ammonites, was bent like a hook beyond 

 the inner reflected part. All the specimens here figured are but fragments.' 



Figs. 2, & 5. Portions of Hamites intermedins, of Sowerby. 



Fig. 3. Hamites plicatilis, of Sowerby. 



Fig. 4. A fragment of Hamites roiundm, of Sowerby. 



Figs. 6, & 7. Two views of a species of an extinct genus, the shells of which, though not 

 chambered, are supposed to have been inhabited by Cephalopoda, like the recent 

 Argonaut. The specimen {BelleropJion costatus, of Sowerby) is from the Mountain 

 limestone of Derbyshire.^ 



Figs. 8, & 9. An Ammonite with a contracted aperture, and three deep constrictions across 

 the disk. From the Inferior oolite of Normandy. 



Figs. 10, & 11. Two specimens of " Scaphites, or Boat-like Ammonite," of Mr. Parkinson, 

 A remarkable cretaceous genus of extinct cephalopoda. The specimens figured are 

 from the Lower chalk of Sussex {Scaphites costatus, of Mantell; S. equalis, of Sowerby). 



Fig. 12. Cast of a spiral chambered shell, caUed Turrilite, of which many species occur in the 

 lower cretaceous strata {Turrilites costatus, of Langius). The quarries of lower chalk 

 at St. Catharine's Mount, near Eouen, in Normandy, have long been celebrated for 

 the number and perfection of specimens of this elegant type of cephalopodous shells. 

 The first known English examples of this genus, as well as of Scaphites, were 

 discovered by me in the chalk marl, at Hamsey, near Lewes, in Sussex, in 1810. 

 Several very fine specimens of a large species {Turrilites tuberculatiis), some of which 

 are more than two feet in length, have been obtained from the same strata. The 

 tubercles on the casts of this species are the bases of strong spines. The siphunculus, 

 in the state of a pyritous cast, is preserved in some examples. 



Figs. 13 to 27. These figures all refer to a very curious group of fossils, termed Niimmulite^, 

 from the supposed resemblance of some of the flat disks to a piece of money. The 

 complexity of their internal structure, and the supposed resemblance of their organi- 

 zation to that of the true Cephalopoda, led to many erroneous opinions as to tlie 



' Medals of Creation, vol. ii. p. 500. ^ Ibid p. 477. 



