Messrs. Parker and Jones on the Foraminifera. 285 



" inflated granular protuberances," render the transfer of both 

 varieties to Euastrum inevitable. 



Unless a strict line of separation, dependent on these charac- 

 ters, is maintained between these two very closely allied genera, 

 I need hardly observe that it becomes impossible to assign cor- 

 rect positions to the numerous varieties bordering on E. elegans 

 and E. binale, on the one hand, and on Cosmarium quadratum 

 and C. Meneghini on the other. 



In side view, each segment presents one central and two ter- 

 minal granular inflations, united by a constricted neck. The 

 frond is compressed. The ends of the basal lobes are rounded, 

 whilst those of the terminal ones are truncate, angular, or sub- 

 angular, the granular bodies being confined to the outer third 

 of each lobe. 



Var. /9. The terminal lobe almost obsolete. Seen in the end 



view, the two segments appear octagonal, and united by 



one of their sides. 



In this case, also, the fronds have been observed under- 

 going division. The varieties are therefore mature forms. 



Length -0018"; breadth -0016". 



Var. 0. Length -0010"; breadth -0018". 



Lower Bengal. 



Plate XIV. fig. 12. Front view. Fig. 13. Side view. Fig. 14. Front 

 view of var. /3. Fig. 15. Basal view of segment. Fig. 16. Side view. 



[To be continued.] 



XXXII. On the Nomenclature of the Foraminifera. 

 By W. K. PARKER, M. Micr. Soc., and T. R. JONES, F.G.S. 



[Continued from p. 183.] 

 Part IV. The Species enumerated by Lamarck. 



THE Lamarckian species of Foraminifera, though treated as 

 microscopic Cephalopods, and represented by very bare engrav- 

 ings, are recognizable, especially by those who have carefully 

 examined the Rhizopodous fauna of the Eocene Tertiary beds of 

 France (particularly the " Calcaire grossier"), whence Lamarck 

 obtained his specimens. As these comprise several important 

 generic and specific types, as well as some peculiar varietal con- 

 ditions, Lamarck, in naming them, supplied for the Foraminifera 

 several generic names (based, however, on ill-defined grounds) 

 which have been adopted by subsequent naturalists, the majority 

 of his binomial appellations being serviceable. 



