VAGINULINA LAEVIGATA. 227 



General Characters. — FaginuUna is an elongate, more or less compressed 

 or complanate Nodosarine, with eccentric (marginal) aperture and oblique 

 chambers ; straight or curved ; septate or compact ; smooth, limbate, or costate. 



Linne adopted the figures published by Plancus, G-ualtieri, and Ledermiiller for 

 his Nautilus legumen} The figure given by Gualtieri is decidedly limbate ; but 

 those by Plancus and Ledermiiller, although apparently limbate, may be smooth 

 (as regarded by Signer Fornasini), with the septa marked only by a difference in 

 the shell- structure, as more clearly shown in Brady's figures in the 'Challenger' 

 Report. Doubtless both the limbate and the smooth forms come together under 

 the same species zoologically, but their readily distinguished features make it 

 convenient to retain distinct names for them. Their relationship was indicated in 

 the tabular list at pages 64 — 66 in Part I ; the smooth forms being variety a, var. 

 /3, and var. ?;; the limbate forms (F. legumen proper) being comprised in varieties 



7» ^5 fj ^> 0> •» '^'• 



The trivial circumstance of the ^/fasi-smooth figure given by Plancus being 

 the first mentioned by Linne in his references (possibly because his was the oldest 

 book) does not keep us from accepting the limhate form (Gualtieri's) as this best 

 medium type (according to the plan followed by Parker and Jones), around which 

 the weak and smooth (F. Isevigata, &c.) on one hand, and the more ornamented 

 forms (F. linearis, &c.) on the other, are taken as noticeable varieties ; as in the 

 classificatory lists above referred to. 



This species (including the forms figured by Plancus and Gaultieri) is referred 

 to by Parker and Jones in the 'Annals Mag. Nat. Hist.,' ser. 3, vol. iii, 1859, 

 p. 479. See also C. Fornasini's remarks on the limbate form in the ' Bollet. Soc. 

 Geol. Ital.,' vol. v, pp. 25 — 30, with woodcut copies of the early figures published 

 by Plancus, Gaultieri, and Ledermiiller. 



1. VAC4INULINA L^viGATA, Iiuevier, 1838. Plate IV, fig. 9 ; PI. V, fig. 8. 



Part I, 1866, pp. 65, 66; and Append. I and II, Tables, No. 44 (Bridlington). 



Additional Synonyms : 



Orthocerata vaginulain gladii ref'erentia, Soldani, 1780. Saggio Orittogr., p. 108, 



pi. vi, fig. 44 mM ; Testaceogr., vol. ii, 

 1798, p. 141. 



1 ' Syst. Nat.,' edit, x, vol. i, 1758, p. 711, No. 248. 



Nautilus legumen, Plancus, Conch. [1739], p. 16, pi. i, fig. 7 ; Gualtieri, Index 



[1742], pi. xix, fig. P. 

 • Syst. Nat.,' edit, xii, vol. i, part 2, 1767, p. 1164, No. 2S8. 



Nautilus legumen, Plancus and Gualtieri, as above ; Ledermiiller, Micr. [1760, 



p. 17; 1761, p. 18], pi. viii, fig.y. 

 30 



