the Nomenclature of the Foraminifera. 229 



the last [properly the first], the lowest in the drawing, is bullet- 

 shaped. At the top it is button-shaped." 



This is a straight Nodosarian, with much-elongated egg- 

 shaped chambers. Setting aside the fact of the first chamber in 

 two of the specimens figured being somewhat globular (whence 

 Batsch's appellation), as a matter of little moment, they accu- 

 rately represent the form figured by Soldani (Testae, ac Zooph. 

 vol. iv. pi. 10. figs, h-m), and named by D'Orbigny Nodosaria 

 ovicula (Ann. des Sc. Nat. vol. vii. p. 252). 



X. Nautilus (0.) Radicula. The Knotted Sea-staff. PI. 3. 

 figs. 10 a, 10 b. [Nodosaria limbata, D'Orb.] 



(Trans.) " The chambers are bullet-shaped, very distinct, and un- 

 usually strong." 



The figures given are of the round-chambered, clear-shelled 

 Nodosaria, free from surface-ornamentation, excepting belts of 

 clear shell-substance at the union of the chambers. The same 

 form is figured by D'Orbigny (Craie blanche du Bassin de Paris, 

 pi. 1. fig. 1) under the name of Nodosaria limbata ; and members 

 of the group of which this may be considered the best central 

 form have received many names at the hands of other authors. 

 The specific name radicula had previously been employed by 

 Linnaeus for another and distinct form of Nodosaria; so that it 

 is not admissible in tbe present case. 



XI. Nautilus (0.) conico-articulatus. The Cone-chambered Sea- 

 staff. PI. 3. fig. 11. \_Articulina conico-articulata, Batsch.] 



(Trans.) "The chambers are shaped like inverted cones, and the 

 walls are folded into oblique furrows. It was quite impossible to 

 grind away this shell, as it was too brittle." 



The feeble forms of Vertebralina, taking a much-elongated, 

 narrow, subcylindrical contour, received from D'Orbigny the 

 generic name Articulina. Though only embracing varieties of 

 the type Vertebralina striata, we may, as a matter of convenience, 

 keep the term. Fig. 11 represents the form indicated in the 

 ' Modeles ' (No. 22), and there named Articulina nitida. 



XII. Nautilus (0.) margaritiferus. The Pearl-bearing Sea-staff. 

 PI. IV. figs. 12 a-12 c. [Vaginulina margaritifera, Batsch.] 



(Trans.) " This strong, elongated, and almost unjointed shell is flat- 

 tened, and has two sharp edges, and has in the middle high and 

 projecting partition-walls, the feeble continuations of which can 

 be seen at one edge." 



A bold thick-shelled Vaginulina, with transverse ribs of clear 

 shell-substance overlying the partition-walls between the cham- 

 bers. A simil ar, but still more lmbate, form has been named 

 by D'Orbign y Vaginulina elegans Modeles, No. 54). 



