248 FORAMINIFERA OF THE CRAG. 



G. crepidula. It has many congeners, varying in relative thickness and other 

 unimportant features. 



Occurrence. — In the North Atlantic and South Pacific at less than 500 fathoms, 

 but it is credited with a much wider area for its habitats. Under various names 

 it may be recognised in descriptions of fossil Gristellarise from both Mesozoic and 

 Cainozoic deposits. We have it from the Crag at Sutton, zone f. 



It has been found fossil in the Neocomian (Bargate beds) ; Cretaceous (Red 

 Chalk) ; Oligocene of Elsass ; and the Miocene and Pliocene of Italy. 



3. Cristellaeia reniformis, d'Orbigny. Plate VII, figs. 18 a, b. 



Ceistellabia eenifoemis, d'Orl., 1846. Foram. Eoss. Vienne, p. 88, pi. iii, 



figs. 39, 40. 



— — Pictet, 1857. Traite Paleont., edit. 2, vol. iv, p. 495, 



pi. cix, fig. 13. 



— — Neugeboren, 1872. Archiv Ver. Siebenburg. Landes- 



kunde, n. f., vol. x, part 2, 

 p. 277, pi. i, figs. 11, 12. 



— — Brady, 1884. Eeport ' Challenger,' p. 539, pi. Ixx, 



figs. 3 fl, h. 



— — de Amicis 1895. Naturaliste Sicil., vol. xiv, pp. 39 



and 62. 



Characters. — One of the compressed, long-ovate Gristellarise, nearly straight on 

 one edge nearest to the umbilicus ; and boldly curved on the other, which has a 

 crest of variable proportions. Chambers well defined, subtriangular, and gently 

 curved. 



Occurrence. — In the North Atlantic at 300 to 1000 fathoms ; South Atlantic 

 at 1900 fathoms. South Pacific at 150—1100 fathoms, and North Pacific at 2050 

 fathoms. In the fossil state it is known from the Eocene (London Clay) ; Miocene 

 of Hungary, Vienna, and Malaga ; and Pliocene of Garrucha, South Spain. 



The specimens from the Crag belong to zone f at Sutton. 



