Nomenclature of the Foraminifera. 479 



(B. b.) A smooth Nodosaria appears in Linnets catalogue (1164. 

 285) as Nautilus Radicula. This is a very common form — the 

 simple Nodosarian type — consisting of a series of smooth, gra- 

 dually increasing, globose chambers, having the peculiar shell- 

 tissue and the distinctive aperture belonging to the species. 

 Nodosaria Radicula passes, by insensible gradations, on the one 

 hand into the short, lumpy, Glanduline condition, and on the 

 other into the elongate forms, moniliform or subcylindrical, 

 straight or curved ; it also frequently occurs flattened, becoming 

 a Lingulina. In either case it puts on more or less freely the 

 little raised lines or riblets of exogenous shell-matter which 

 constitute the characteristic ornamentation of the Nodosarince. 

 Had we chosen to adopt the simpler form of a species as the 

 type (as Prof. Wilhamson has been inclined to do), N. Radicula 

 would have well served for this purpose. 



The delicate tapering and curved Nodosarics, of which Den- 

 talina communis, I) 'Orb., is a well-known form, do not appear 

 to have been recognized by Linnseus or by Gmelin, although 

 Ledermiiller figured them in his 'Mikroskopische Augen- und 

 Gemiiths-Ergotzung,^ 1761, pi. 4. figs. o,p, & pi. 8. fig. /. This 

 form has been ranked by Lamarck as a species under the name 

 Nodosaria dentalina, which we shall find useful. 



The NodosaricB, ribbed, smooth, and dentaline, are abundant 

 in the Mediterranean and on most sea-coasts at certain depths ; 

 they abound in the liondon Clay, Chalk, Gault, and in the Kim- 

 meridge, Oxford, Lias, and Upper Trias Clays. Nodosariae occur 

 also in the Carboniferous and Permian rocks. They are very 

 fine in some of the Italian and Spanish tertiary beds and in 

 those of San Domingo. In the Chalk and Gault also some fine 

 individuals frequently occur. 



(B.C.) Nautilus Legumen (1164. 288) is the well-marked iVb^o- 

 saria {Vaginulina) Legumen. The Vaginulince, with their com- 

 pressed obliquely-set chambers and lateral aperture, are con- 

 veniently separated from Nodosaria proper ; but no real divisional 

 line exists between the Vaginulina and Nodosaria (through the 

 Dentaline forms) on one side, and Cristellaria (through the 

 Marginulines) on the other. 



The Vaginulina have a similar range to that of the Nodosaria, 

 excepting that they have not yet been found in any older rock 

 than the Upper Trias. 



(C.) Linnets Nautilus crispus (1162. 275), the Polystomella of 

 Lamarck, is an easily recognizable form under variously modified 

 conditions, chiefly as to its thickness and its sculpture ; and it 

 occurs on every coast. 



(D.) Nautilus Beccarii (1162. 276) is the common form of the 

 Rotalia Beccarii of the Mediterranean and Atlantic. This spe- 

 cies has a world-wide range under many strikingly different 



