Manchester Memoirs, Vol. Ixii. (191 7) 85 



193. Marginulina pyramidale, (Karrer), var. globosa, nov. 



PI. V, fig. 2. 



This species was figured and described by Karrer in 1861* 

 and was placed in the genus Rhabdogonium, probably on 

 account of its triangular transverse section. On reference to 

 his drawings it is seen that the shell has a certain curvature in 

 the. longitudinal axis, and moreover the oval aperture is excen- 

 trically placed, so that the shell would be in a truer position if 

 transferred to Marginulina. The new variety which is very rare, 

 now figured and described, bears out this view. It differs from 

 the type species chiefly in having more globular chambers and 

 the sutures more deeply excavated. Length, 6 mm. 



I have obtained from the Blue Marl, near Antibes, South 

 France, some fine specimens of M. pyramidale (Karrer); these 

 examples display still more clearly their true genus than the 

 Biarritz shells. They may be briefly described as long, slender, 

 and tapering, having a small globular primordial chamber armed 

 with a long spine at the base, the sutures are oblique on*the two 

 lateral faces, and the oral orifice is placed at the dorsal angle 

 of the final chamber. 



(Halkyard's specimens are markedly megalospheric whilst 

 Karrer's figure represents a microspheric form. The two.' 

 forms are probably therefore identical.) 



194. Marginulina behmi (Reuss.) 

 PI. V. figs. 3, 4. 



Cristellaria behmi, Reuss, 1865. Denkschr. k. Ak. Wiss. Wien,. 



vol. XXV, p. 138, pi. TI, fig. 37. 

 Marginulina behmi, Jones, 1876, M. Micr. Journ., vol. XV, pi.. 



CXXIX, fig. 3. 



The figures given on PI. V represent the megalospheric 

 and the microspheric forms of this species. The latter is the- 

 rarer of the two forms, and I am not aware that it has been 

 previously recorded. If the microspheric form (fig. 4) had been 

 discovered alone , without its companion, it would undoubtedly 

 have been referred to Schlumberger's genus Amphicoryne 

 which has the earlier chambers cristellarian followed by a 

 nodosarian series. The presence and identification of these 

 two forms of the same species leaves no doubt in my mind 

 as to the ultimate abandonment of the genus Amphicoryne and 

 it now remains to search for the companion of A. falx (J.& P.); 

 which is the most characteristic species of that genus. 



* Rhabdogonium pyramidale, Karrer, l86l r Sitz. d.k» Ak. Wiss. Wien. vol.. 

 XLIV. (1862), Abth. I, p. 444. pi. 1. fig. 5. 



