FORAMIJSriFERA OF THE ATLANTIC OCEAN 45 



Such specimens occur in my material from Castel Arquato and may 

 be taken as topotypes. 



Material referred to this species occurs of! the coasts of the British 

 Isles and in the Mediterranean as well as in the Indo-Pacific. There 

 is such confusion in the literature between this and S. limhata that 

 references to the literature can be made intelligently only after a 

 study of the original specimens in each case. 



Williamson figures specimens as var. roiundata and var. cymhium 

 which are reproduced here. The former (pi. 9, fig. 10) may possibly be 

 referred to S. nitida d'Orbigny, a species that has been recorded from 

 the British Isles and the coasts of France. 



SPIROLOCUUNA DORSATA Reuss 



Heron-Allen and Earland record this species as new to Great Brit- 

 ain * but do not give figures. They note its resemblance to and prob- 

 able confusion with S. limhata d'Orbigny. 



Genus NUMMOLOCULINA Steinmann, 1881 



Nummoloculina Steinmann (Genoholotype, Biloculina contraria d'Orbigny) 

 Neues Jahrb., 1881, p. 31. — Cushman, Special Publ. No. 1, Cushman Lab. 

 Foram. Res., 1928, p. 149. 



Biloculina (part) d'Orbigny Foram. Foss. Bass. Tert. Vienne, 1846, p. 266. 



Planispirina (part) H. B. Brady (not Seguenza), Rep. Voy. Challenger, Zool- 

 ogy, vol. 9, 1884, p. 195. 



Test with the earliest chambers quinqueloculine, later ones in a 

 single plane, several making up a coil; aperture rounded with a flat, 

 semicircular tooth. 



Jurassic to Recent. 



In this genus an entirely new structure is developed from a quin- 

 queloculine young. The chambers are developed in one plane but 

 instead of a half coil in length they become progressively shorter so 

 that as many as sLx chambers make up the last complete coil. 



NUMMOLOCULINA CONTRARIA (d'Orbigny) 



Plate 10, Figures 1 a,b 



Bilocxdina contraria d'Orbigny, Foram. Foss. Bass. Tert. Vienne, 1846, p. 



266, pi. 16, figs. 4-6.— H. B. Brady, Trans. Linn. Soc, vol. 24, 1864, p. 



466, pi. 48, fig. 2.— Reuss, Sitz. Akad. Wiss. Wien, vol. 55, abt. 1, 1867, 



p. 70, pi. 1, fig. 10.— Karrer, Sitz. Akad. Wiss. Wien, vol. 58, abt. 1, 



1868, p. 131. 

 Nummoloculina contraria Steinmann, Neues Jahrb., 1881, p. 31, pi. 2, figs. 



1-7. 

 Planispirina contraria H. B. Brady, Proc. Roy. Soc. Edinburgh, 1882, p. 

 713; Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 195, pi. 11, figs. 10, 

 11, text fig. 5.— J. Wright, Ann. Mag. Nat. Hist., ser. 6, vol. 4,1889, p. 

 447 (list); Proc. Roy. Irish Acad., ser. 3, vol. 1, 1891, p. 465.— Egger, 

 Abhandl. kon. bay. Akad. Wiss. Munchen, CI. II, vol. 18, 1893, pi. 3, figs. 



* Trans. Linn. Soc. London, Zoology, vol. 11, 1916, p. 207. 



