Nomenclalure of the Foraminifera. 295 



pi. 62. f. 9. Discorhula Ariminensis, Tabl. Enc. Metli. pi. 4G6, 

 f. 6 a,b. "Fossil; Grignon." 



This is Rotalia Beccarii, Liun., of common occurrence. 



11. Lenticulina. Ann. Mus. v. p. 186. This comprises some 

 small Niimmulin(E and a Crisfellaria. Lamarck states that he 

 had recent Lenticulina from the Sea near Teneriffe, taken at 

 125 feet depth. Defrance^ however, doubts this, and thinks that 

 the specimens were Crist ell aria, and probably fossilized (Diet. 

 So. Nat. XXV. p. 452). We have found two " Lenticuline " forms 

 very common in the sea-sands (at 50 fathoms) off Orotava, Tene- 

 riffe, namel}^, Amphistegina vulgaris and Cinstellaria Calcar, var. 

 rotulata. Lamarck's genus " Lenticulina " (like his other genera 

 of " microscopic Cephalopodous shells '') evidently rests on very 

 indefinite grounds. 



Lenticulitcs planulata. Ann. Mus. v. p. 187, No. 1 ; Hist. 

 An. s. Vert, vii. p. 619, No. 1. " Fossil ; Senlis, Retheuil near 

 Villers-Coterets, and Soissons.-*^ [Defrance adds Betz and 

 Gilocourt.] 



This was recognized as a Nummulina by D'Orbigny (Ann. Sc. 

 Nat. vii. p. 296, No. 4) ; and it is the type of the " radiate " 

 group of Numniulites. (Sec Annals Nat. Hist. ser. 3. vol. v. 

 p. 109.) N. planulata is fully described and illustrated by d'Ar- 

 chiac and Haime (Foss. Num. dc PInde, p. 142, pi. 9. f. 5-10), 

 by whom also the localities of its occurrence are carefully enu- 

 merated. 



12. Lenticulitcs variolaria. Ann. Mus. v. p. 187, No. 2; Hist. 

 An. s. Vert. vii. p. 619, No. 2. "Fossil; Grignon, Betz, and 

 Chaumont." [Defrance adds Parncs and Acy.] 



Sower by recognized this as a Nummulite (under the term 

 Numrauluria variolaria, Min. Conch, pi. 538, f. 3). D'Archiac 

 and Haime give the history and dcscri])tion of Nummulina vario- 

 laria, op. cit. p. 146, ])1. 9. f. 13 a-g. We agree with Prof. 

 Williamson in regarding A\ tww/«na as a small biconvex variety 

 oi N. planulata (Williamson, Monogr. p. 39). 



13. Lenticulitcs rotulata. Ann. Mus. v. p. 180, No. 3; viii. 

 .pi. 62. fig. 11 ; Tabl. Enc. Meth. pi. 466. fig. 5; Hist. An. s. 

 Vert. vii. p. 620, No. 3. " Fossil ; Chalk, iMeudon.'' 



D'Orbigny (Mem. Soc. Geol. France, 1840, vol. iv. p. 26) 

 was the first to separate this from the other Lenticulina or Len- 

 iiailites (which he arranged in their place as Nummulina), and 

 to group it in the genus Cristellaria, defined by him far more 

 correctly than by Lamarck, who had selected a melange of 

 broadly Nautiloid unrelated forms from Fichtel and MolPs 

 plates, and given them this generic name (Anim. s. Vert. vii. 

 p. 607). 



Cristellaria rotulata is a common kcelless variety of C. Calcar 



