Recent and Fossil Fovaminifera. 329" 



Fossil and recenl specimens. The fossils are not in a good state 

 of preservation, having been apparently obtained from some dis- 

 integrated crystalline deposit, probably a limestone of Tertiary a; 

 Some of the recent specimens are exceptionally large and fine. 



This is a very well marked type, and possesses certain charac- 

 teristic features in the shape of a flat depressed shell with broad 

 straplike sutures, which render it easy of identification. There is 

 also a characteristic glassiness about the texture due to the ex- 

 tremely minute size of the perforations which separates it from 

 other species of Discorbina, most of which are rather coarsely 

 perforate. 



Brady {supra), for some reason not very apparent, placed the 

 species in the genus Rotalia, and considered it to be an isomorph 

 of Discorbina turbo (d'Orbigny). He regarded it as a starved 

 modification of Rotalia beccarii (Linne sp.), but it appears to us to 

 have nothing in common with that species. On the other hand, it 

 is evidently very closely allied to Discorbina rosacea d'Orb. sp., of 

 which it may perhaps be regarded as a simple and original variety. 



369. Discorbina patelliformis Brady var. corruga-ta var. n. 



(Plate X. figs. 22-24.) 



Discorbina patelliformis Brady, 1884, Foram. 'Challenger,' p. 647, pi. lxxxviii. 

 fig. 3; lxxxix. fig. 1. 



The curious little shell which we figure should, we think, be 

 referred to this species, although it differs from the type in its 

 sutures. These, instead of being broad but flush bands of clear 

 shell-substance as in the type, are strongly limbate, some of them 

 projecting almost as carimr. The under surface of the shell is 

 broken, and has somewhat the appearance of having once been 

 joined in plastogamy with another shell. 



The specimen is apparently a fossil. Brady's specimens were 

 from the Pacific. It is generally distributed in warm seas. 



Breadth, 0'2 mm. Height, 0-14 mm. 



370. Discorbina pileolus d'Orbigny sp. 

 (Plate XL figs. 1, 2.) 



Valvulina pileolus d'Orbigny, 1839, Foram. Arner. Merid., p. 47, pi. i. figs. 



15-17. 

 Discorbina pileolus (d'Orbigny) Parker and Jones, 1865, Phil. Trans., vol. civ. 



p. 385. 

 Ditto. (d'Orbigny) Brady, 1881, Forain. 'Challenger,' p. 649, pi. lxxxix. 



figs. 2-4. 

 Ditto. (d'Orbigny) Chapman, 1900, Journ. Linn. Soc. Lond. Zool., vol. xxviii. 



p. 191. 



A few minute and very weakly developed specimens have been 

 found, which we refer to this species. The shells, which are in 



