Nomenclature of the Foraminifera. 235 



variety N. scabra well represent the " reticulatae " throughout 

 the Nummulitic rocks. Between N. lavigata, N. Dufrenoyi, 

 and N. complanata we believe there are steady gradations which 

 render the multiplication of specific names unnecessary. 



It results, then, that, in our opinion, although it is expedient 

 to have binomial terms at hand wherewith to name the more 

 important varieties of Nummulina, recent and fossil, yet for the 

 purposes of philosophical zoology Nummulina may be recognized 

 as a genus with but a single species, which, for our part, we 

 should consider to be typified by that unhappily named creature 

 N. perforata, one of the stoutest and solidest of the whole group. 



To render more apparent the successful results of MM. D'Ar- 

 chiac and Haime's labours in elucidating the bibliographical 

 history of the Nummulites and in reducing their confused no- 

 menclature to order, we append the lists of Nummulites named 

 and figured by several of the old authors, in chronological order, 

 with remarks on the probable identifications of subspecies or 

 varieties. In this we have largely availed ourselves of the in- 

 formation given by D'Archiac and Haime. We believe also 

 that these correlations will be found to be of considerable value 

 to students, even if only in saving them time in hunting up the 

 references to antiquated works. 



FORSKAL. 1775. 



Forskal. Descriptiones Animalium &c. in itinere orientali, &c. 

 4to, Copenhagen, 1775. This is a posthumous work ; it is ap- 

 pended to Forskal's 'Flora .^gyptiaco-Arabica,' and followed 

 by ' Icones rerum ' &c. 



p. 125. no. 65. Nautilus pertusus*. This appears, from the description, 

 to be a Peneroplis ; and therefore the species should be termed P. 

 pertusa, and not P. planata, according to right of priority. 



p. 125. no. 66. N. Orbiculus. This is either OrbitoUtes complanata,Lam., 

 or Orbiculina adunca, F. & M. ; probably the former. 



p. 140. Nautihis ? Gizensis. This is the Nummulina Gizensis or Gizehensis. 



p. 140. N. major. This probably is the N. complanata, Lam. 



In the Berlin Acad. Transactions for 1838 (1839), p. 93, 

 Ehrenberg refers to the presence of four species of Nummulites 

 in the limestone near Cairo and Gyzeh ; one of them he names 

 N. Gyzemis (after Forskal), and another A^ Placentula, which is 

 Forskal's .V. major, described by him as " placentaeforma " and 

 as "Nautilite placentule." 



* This and the following synonym were overlooked by us when noticing 

 the nomenclature of Peneroplis and OrbitoUtes in the Ann. Nat. Hist. 

 ser. 3. vol. v. p. 1/9 & p. 291. 



