in the same plane, Middenly descend, giving to the shell that form of 

 an obelisk which is culled litrreted* 



It is also thought, and from similar considerations, that we should 

 ivfrr to the Cephalopoda, and consider as internal shells the 



C\MI KIMS. II rug. Nf.MMii i IKS, Lam. 



Commonly called .\uni/nn/if<'^ A ' um<"<nniHh-<, lenticular stones^c. 

 which also are only found among fossils, and present, externally, a 

 lenticular figure without any apparent opening, and a >pii 

 internally, divided by -."ptu into numerous small chambers, but with- 

 out a MpJion. It i.s one of the mo>t universally diffused of all foil>. 

 forming, by itself alone, entire chains of calcareous hilU and imni'-n-e 

 bodies of building stonef. 



Tlie most common, and tlue which attain the greatest size, form a 

 complete disk, and have only a single range of chambers in each 

 whorl J. 



Some very >mall species are also found in certain seas||. 



Thr margin of other small species, (the siderolithes,, Lam.,) 

 both fossil and living, r.re bristled with points which give them a 



The labours and researches, fruits of an infinite patience, of Bian- 

 chi (or Janus Plane us), Soldani, Fichtel, and Moll, Alc,.a*d D'Or- 

 bigny. h tinod an astonishing number of these chambered 



sliviU without a siphon, like the Nummulites, that are extremely 

 small and frequently microscopical, both in the sea, among the sand, 

 fucus, &c. and in a fossil state in the sand formations of variou> 

 countries. They vary in a remarkable degree as to their general 

 form, the number and relative position of the chambers, &c. In one 

 or two species, the only ones whose animals have been observed, there 

 appears to be a small oblong body crowned by numerous and red 

 tentacula, which, added to the septa of the shell, have caused them to 

 be placed immediately after the Cephalopoda, like the genera just 

 mentioned, an arrangement, however, which requires to be confirmed 

 by more numerous observations before we can consider it as conclusive. 



Such of these species as were known in the time of Linnaeus and 

 (imelin were placed by those naturalists among the Nautili. 



de Phys., an. VII. pi. i, f. l. There are some doubts as to the 

 MI i.i tin- Mphon. lYrhaps, as M. Adouin observes, what has been taken for 

 it, i- tin- roluiiirllnr com idutinn. 



f The stone termed pin-re de Loon is wholly formed of Nummulites. Thr 

 pyramids of Egypt are placed upon rocks of this description, which also furnished 

 tin- III;UIT".;II- < i the superstructure. See the Memoir of Fortis on the Discolitea iu 



i-tirl df Thnn/, as woll as Lam., Aniin. *ms 



Method, des Cephalopoda. 



; / , I'i.ht., and Moll., VI. a, b, c, d; Naut. Itxficvlaris, 

 LI, a !i. To tl. is genus also we refer the LICOPHRE ami 

 . 158, ICG, and his ROTALITE, 162, which differs from the ROTA LIES of 

 Lainarrk. 



|| .Vuii/i/iw nuliuli's. I'icht. and Moll., VII., a, b, c, d ; Nmtt. Vaunts, lb.. o, 



tpotde, Lam. Fau., Mont, de St. Pierre, pi. xxxiv. 



VOL. III. C 



