344 PORAMINIFERA OF THE CRAG. 



NoNioNiNA BouEANA, Brady, 1881. ' Challenger ' Eep., p. 729, pi. cix, figs. 12, 13. 



— — Terriji, 1889. Mem. R. Accad. Lincei, ser. 4, vol. vi, 



p. 119, pi. X, fig. 5. 



— — Ef/ger, 1893. Abhandl. k. Bayer. Akad. Wiss., vol. xviii, 



p. 426, pi. xix, figs. 34, 35. 



— — Goes, 1894. K. Svensk. Vet.-Akad. Hand)., vol. xix, 



p. 104, pi. xvii, figs. 829 o, h. 



Characters. — The varietal form uuder notice has a nearly circular outline and 

 subacute peripheral edge ; it is stoutly made, and the chambers, which are 

 numerous, narrow, falciform, and slightly inflated, inci'ease rather rapidly in size 

 towards the end. Some specimens are rather more oval than others. One 

 umbilicus is exposed, and on this side the sutures are visible from the periphery 

 to the umbilicus, but the other umbilicus is covered with granular shell-substance. 

 Thus the variety under notice has at once the two characters that divide the 

 Nonioninse into two series. Hence it may be called Janiformis. 



N. asterizans in Fichtel and Moll's figures has the two sides differing in a 

 similar manner ; but this new vai'iety is the most pronounced of the unsym- 



<. 28 a, 28 b, 28 c. Nonionina Boneana, d'Orb., var. 



Janiformis, nov. Specimen from the Coralline Crag, 

 'lomer (zoneg?). x" 30 diameters. 26 a, the closed 

 ^iile ; 26 b, the open side ; 26 c, the apertural face. 



metrical forms of the genus that Mr. Millett has been able to observe. He 

 regards it as more developed in this direction than N. asterizans. In its con- 

 tours it agrees more closely with N. Boueana. 



Occurrence. — Numerous specimens in good condition were found by Mr. Millet 

 in the Coi'alline Crag at Gomer, or Gomer Field (now ploughed over), between 

 the Ferry on the River Butley and Gedgrave, Suffolk. 



Iq the recent state Nonionina Boiicana lives in comparatively shallow water in 

 the Atlantic and the Red Sea; also near Amboyna, Hong Kong, and the west 

 coast of Patagonia. It is found in the Oligocene of Germany, and the Miocene 

 of Austria and South Italy. 



