Nomenclature of the Foraminifera. 291 



especially the erroneous notions published respecting the hyaline 

 columns, or septal pillars), and on Nummulina lavigata in parti- 

 cular. This is the type of d'Archiac and Hairnets group " sub- 

 reticulate," which we include in the " reticulate " group. It 

 abounded in the European area of the Nummulitic Sea, but 

 appears to be extinct now. 



2. Orbitolites complanata. Syst. Anim. s. Vert. p. 376; 

 Orbulites complanata, Hist. An. s. Vert. ii. p. 196. We must 

 refer the student to Dr. Carpenter's Monograph (Philos. Trans. 

 1856, vol. cxlvi. p. 181, &c. pi. 4-9) for the history and detailed 

 description of Orbitolites, the subject being there treated most 

 perfectly. O. complanata is common in the warmer seas. Of 

 small size in the Mediterranean, it is larger in the Red Sea, and 

 much larger in the Tropics and South Sea. In the fossil state, 

 it is large in some of the Eocene deposits, and is very common 

 in the Tertiaries of Grignon and Hauteville. It has been found 

 also in the Bracklesham beds (by the Rev. 0. Fisher, F.G.S.). 



For the synonymy of O. complanata, see Dr. Carpenter's me- 

 moir above referred to, and especially Morris's ' Catalogue of 

 British Fossils/ 1854, p. 39; also Bronn's f Lethsea Geognost/ 

 third edit. vol. iii. p. 254. 



Lamarck's Orbitolites concava, Syst. An. s. Vert. p. 376, is 

 evidently a Lunulite ; his Orbulites concava, in the Hist. An. s. 

 Vert. ii. p. 197, belongs to the Orbitolina of D'Orbigny. 



3. Siderolites calcitrapoides. Syst. Anim. s. Vert. p. 376; 

 Tabl. Enc. Me'th. pi. 470. figs. 4 a-k. "Fossil; Chalk, Maes- 

 tricht : Faujas." 



This is the same as the " Nautilus Spengleri" of Gmelin, 

 well figured by Spengler, by Faujas, and by Fichtel and Moll. 

 Lamarck grouped it with the Corals; but D'Orbigny, in his 

 ' Tabl. Ceph.,' judiciously placed it in his genus Calcarina (Ann. 

 Sc. Nat. vii. p. 276). Calcarina Spengleri is noticed in some 

 detail by us in 'Annals Nat. Hist.' 3 ser. vol. iii. p. 480. 



4. Rotalites tuberculosus. Syst. Anim. s. Vert. p. 401. 

 " Fossil; Grignon." 



This is possibly the Rotalia afterwards termed R. trochidi- 

 formis by Lamarck ; but it is very ill-defined here, and the name 

 is not repeated in subsequent notices of the Foraminifers of 

 Grignon by either Lamarck or others. 



5. Oveolites Margaritula. Syst. Anim. s. Vert. p. 402; 

 Ovulites Margaritula, Tabl. Enc. Meth. pi. 479. fig. 7; Hist. 

 Anim. s. Vert. ii. p. 194. " Fossil ; Grignon." 



This is a common Foraminifer of the " Calcaire grossier." 

 Shaped like an egg, and about the size of a mustard-seed, the 

 Ovulites Margaritula, when well-grown, is one of the most ele- 

 gant of the fossil forms. The large terminal apertures, more- 



