Manchester Memoirs, Vol. Ixii. (191 7) 81 



Genus Lingulinopsis, Reuss. 



178. Lingulinopsis acutimargo, sp. nov. 

 PI. V, fig. 1. 



Two specimens were found which differ from Lingulina in 

 that the early portion of the shell is formed on the spiral plan 

 of growth as in Cristellaria, and later becomes linear as in 

 Lingulina. Apart from this dual plan of arrangement of the 

 chambers there is nothing to distinguish my specimens from the 

 typical Lingulina carinata, d'Orb., and, but for the fact of more 

 than one example being found of this type, I might have felt 

 inclined to include it with the preceding species, though an 

 abnormal individual of it. Under the circumstances it is advis- 

 able however to refer the Biarritz specimens to Reuss' genus 

 which was founded for the inclusion of species having a similar 

 plan of growth. The dimensions of a well-grown specimen 

 are: — Length, .72 mm. Breadth, .63 mm. 



(In our opinion Lingulinopsis is a genus of no morpho- 

 logical importance. These specimens should therefore be re- 

 ferred to Lingulina carinata. The presence of a minute spiral 

 initial portion is of fairly frequent occurrence in Lingulina 

 though it seldom reaches the same development as the 

 flabelline spiral of Frondicularia.) 



Genus Vaginulina, d'Orbigny. 

 179. Vaginulina legumen (Linne.) 



Nautilus legumen, Linne, 1758, Syst. Nat., ed. 10, p. 711; 1788, 



13th ed. (Gmelin's), p- 3,373- 

 Vaginulina legumen, Brady, 1884, Chall. Rep., p. 530, pi. 



LXVI, figs. 13-15. 



This species is rare at Biarritz, but all the same specimens 

 show considerable variation, ranging from a delicate com- 

 pressed form with an aboral spine to a stout form with a globular 

 primordial segment and circular section, and which only pro- 

 claims its affinity to the genus by the extreme excentricity of 

 its oral aperture. 



(Some of the delicate compressed forms in tne Halkyard 

 collection are very near the specimens which we figured from 

 the West of Scotland (H-A. & E. 1916. F.W.S. p. 256. pi. XLII. 

 figs. 1, 2,) as vaginuline forms of Nodosaria communis 

 ■d'Orbigny.) 



