Nomenclature of the Foraminifera. 21 



Model no. 14. Robulina virgata, D'Orb. Page 290, no. 17. 



Hab. Adriatic, near Rimini. PI. I. fig. 40. 



An umbonate Cristellaria, with few chambers, and destitute 

 of any keel. Thick square bands of shell-substance, covering 

 the partition-walls of the chamber, radiate in straight lines from 

 the central umbo to the margin. 



Model no. 15. Rotalia bisaculeata, D'Orb. Page 273, no. 20. 



Hab. From ballast-sand. PI. III. fig. 89. 



This is rather a subvariety of the Rotaline genus Calcarina, 

 of which Model no. 34 may be taken as the type. It does not 

 differ very greatly from Deshayes's Calcarina rarispina (Lyell's 

 Manual, 5th edit. p. 228, fig. 236), but sufficiently, however, to 

 render a separate trivial name convenient. Its peculiarity con- 

 sists in possessing a keel, extended into double points at inter- 

 vals round the margin. 



Model no. 16. Peneroplis planatus*, F. & M., sp. 

 Page 285, no. 1. 



Hab. Mediterranean, New Holland (Rawack). PI. I. fig. 17. 



This is the well-known widely distributed type, for which, as 

 we have before stated, Forskal's specific name Peneroplis per- 

 tusus takes precedence (Ann. Nat. Hist. March 1865). 



Model no. 17. Globigerina bulloides, D'Orb. (young). 

 Page 277, no. 1. 



Hab. Adriatic, near Rimini. PI. II. fig. 56. 



This is the young shell. See note on the adult, Model 76. 



Model no. 18. Adelosina striata, D'Orb. (young). 

 Page 304, no. 2. 



Hab. Fossil at Castel-Arquato, Italy. PI. I. fig. 14. 



It has been satisfactorily demonstrated that the delicate Mi- 

 liotce, with retort-shaped chambers, grouped by D'Orbigny 

 under the generic name Adelosina, are only young specimens of 

 other well-known species. The Model now under consideration 

 represents the very young condition of Quinqueloculina Brong- 

 niartii ; and the Model 97, which is given as the adult of the same 

 species, is only Q. Brongniurtii somewhat further developed. 



Model no. 19. Cristellaria [Saracenaria] Italica*, Defr. (young). 

 Page 293, no. 26. 



Hab. Adriatic, near Rimini ; and fossil near Sienna. PI. I. 

 fig. 42. 



The young condition of the shell. See note on the adult, 

 Model no. 85. 



