PETRIFACTIONS. 109. HdmmthoHthus. 335 



Maattilius. The Nautilus. 



J. ThcflicllfpiraU 



<« Witli the out-er wh-orl of t^e Ihell mucli larger than the others. 

 Very common m NorthampfovJhire<» Ktnt-t Sheppey and other part* 

 of England^ in France^ Germany* Italy, Saxony^ S^nviizeriandy 

 Au{tria<, &c- generally maxmoreoiJs« fonaetimcs pyritaccous 

 or filiceous, 



b. With the -whoTls of the -fpire gradually decrea(in|^ inwardly. 



Cornu Ammonii, Serpent -f tune, Snake-ft'Ofie* 

 HelTnintho1hh«s Nautili. Svfl. nat. xU. 3. p. 162. n i. 

 Cornu AmKioms^ Wolf. Half tab. 7.. /I i — 3. / %, f,^i^ 

 Helaiintholithijs Nautili. MufTefJtn. 86. tab. 4. 

 Ammonites. Ge/ner petrif. 47 Gefa./i^. \6j^. f, 4- 

 Sgeiverby Britijh minerals, tab, ii. 



t. With the circuififcrence acut-e and entire, the dife com- 

 preffeda aiwl the fuiiu-es flexuous. Mujl '^tjji&, pg» 11. 



2.* With tine circiamfencnce carinatc and «!nti(nc<, the ^ifkcom- 

 pretQ"e<ci^ and ihc grooves cIovcb* Mu/, TeJJis, /I < o<. 



3. With the ciTcumfercnce carinate and crenate, the grooves 

 of the diik elevated and remate. Muf T^/z. fig^ 9, 



.4, With the circumference obtufe, the diik a htcle compreiTed 

 and ftriate. Miij\ T£jjin^fig 7. 



5, With the circumference obt-uic, the diik com prelTed, and the 

 grooves of the back cloven. Muj\ Tejffin. Jig. 2. 



i6. With the circtimfeience deprelfed, and the £\^z% of the diik 

 knotty, Mu/^ Te£in, fig, S, 



7. With the circumference dep-efled, and the diik with acute 

 liriae. 3/y. Tejija, Jig. 3. 



S. With the circuffliference fo<ijnewhat liqu're ai>d carin ate, 4in4 

 the grooves acute and remote. Muf, TeJJin. fig, n d. 



19. With the circumference rounded and knotty, and the grooves 

 tranfverfe and flexUDU^. Muf. itj'sin. Jg, \, 



Four»d in almoft every part of the globe-, in marble, Hmc- 

 \ ftone, clay, marl, fwinell ne, hornitone, pgate, flint, &c. 



from the fize of a fixpence to more than two feet in diame- 

 ter: the chambers are often £!led with cryilals of varioiu 

 Icind&o 



c. Tlie Helicite. 



Found in Lapland^ France^ Spain^ Italy, Hungary ^ Aufiria^ S«K«f- 

 zerlandt Sec, in lim.eilone, deraciicd or iixed, fofitary or ze- 

 gj-egate. 



