I 



Nomenclature of the Foraminifera. 295 



1. 62. f. 9. Discorbula Ariminensis, Tabl. Enc. Meth. pi, 466, 

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

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



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

 small Nummulina and a Cristellaria. 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 Cristellaria, and probably fossilized (Diet. 

 Sc. Nat. xxv. p. 452). We have found two " Lenticuline " forms 

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

 riffe, namely, Amphisteaina vulgaris and Cristellaria Calcar, var. 

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

 of "microscopic Cephalopodous shells") evidently rests on very 

 indefinite grounds. 



Lenticulites 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 Nummulites. (See Annals Nat. Hist. ser. 3. vol. v. 

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

 chiac and Haime (Foss. Num. de 1'Inde, p. 142, pi. 9. f. 5-10), 

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

 merated, 



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

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

 Chaumont." [Defrance adds Parnes and Acy.] 



Sowerby recognized this as a Nummulite (under the term 

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

 and Haime give the history and description of Nummulina vario- 

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

 Williamson in regarding N. variolaria as a small biconvex variety 

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



13. Lenticulites 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, Meudon." 



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

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

 ticulites (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 Moll's 

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

 p. 607). 



Cristellaria rotulata is a common keelless variety of C, Calcar 



