Nomenclature of the Foraruinifeia. 231 



the radiate, the sinuate, and the reticulate, typified respectively 

 by Nummulina planulata, Lam., N. complanata. Lam., and N, 

 Icevigata, Lam. The " granulate " and the " explanate " groups, 

 also used by MM. D'Archiac and Haime, we do not recognize 

 as essential, — the former being founded on a character common 

 to each of the three above-mentioned groups (and misunderstood 

 by our authors), and the latter also depending on a modification 

 of structure occurring in two at least of the other grou])S. 



What we have now to consider is — which of the NwnmuUnce 

 are, for the purposes of zoology, to be accepted as specific forms. 

 As before stated, we regard as types those Foraminifers that 

 present a fair average of the characters proper to the species, 

 and are neither the simplest of the group, nor necessarily the 

 largest and most richly provided with the peculiarities of struc- 

 ture found in the group. 



We must once more remind the reader that we do not object 

 to binomial appellations as distinctive terms for well-marked 

 varieties of Nu?ntnulintf or other Rhizopods. In this case, how- 

 ever, the subject of which we are treating is real specific rela- 

 tionship. 



When we tabulate the fifty-five NummulitieE described as species 

 by MM. D'Archiac and Haime in their Monograph, we find six 

 that are simply radiate : these are all of small size (6 millimetres 

 and less in diameter) ; two of them are granulate {N. Miscella 

 and N. Lucasana), and four are smooth {N. Ramondi, N. Guet- 

 tardi, N. variolaria, and N. Heberti : the last two have the radii 

 slightly curved). 



There are two, N. Rouaulti (granulate) and N. curvispira 

 (each less than 12 millimetres in diameter), that are simply ra- 

 diate, but the septal lines are not quite straight. iV. mamillata 

 is an Assiline subvariety of N. Rouaulti. 



N. striata, a small form, is simply radiate in some varieties, 

 sinuo-radiate and sinuate in others. 



There are four that are radiate with a slight sinuosity of the 

 septal lines (iV. contorta, N. obesa, N. Vicaryi, and N. discor- 

 bina : the first and the last are less than 12 millim. in diameter ; 

 the second attains a diameter of 12 millim., and the third of 

 18 milhm.). These are all smooth. 



There are five having sinuo-radiate septal lines : viz. 



N. Vasca, not attaining 



N. planulata, attaining 



iV. Viquesneli, attaining 



N, Beaumonti, not attaining 



N. Biaritzensis, attaining 



The last-mentioned, however, exhibits both the radiate and 

 sinuo-radiate style of growth in different individuals. 



a diameter of 12 millimetres. 



