68 BULLETIN 104, UNITED STATES NATIONAL MUSEUM 



Eocene to Recent. 



There are no Atlantic records for the genus, the living forms being 

 restricted to the Indo-Pacific. 



Genus SIPHONINA Reuss, 1849 



Siphonina Reuss, Denkschr. k. Akad. Wise. Wien, vol. 1, 1850, p. 372. — 

 CusHMAN, Special Publ. No. 1, Cushman Lab. Foram. Res., 1928, p. 278. 

 Rotalia (part) Czjzek (not Lamarck). 



Planorbulina (part) Parker and Jones, 1865 (not d'Orbigny). 

 Truncatulina (part) of Authors. 



Genoholotype. — Siphonina Jimbriata Reuss. 



Test trochoid, biconvex, umbilical region typically closed; wall 

 calcareous, coarsely perforate; aperture just ventral to the periphery, 

 elliptical, with the long axis parallel to the periphery, in fully developed 

 species with a short neck and phialine lip. 



Cretaceous to Recent. 



For a fuller discussion of this genus and its species, see Cushman, 

 Foraminifera of the Genus Siphonina and Related Genera.^^ 



SIPHONINA RETICULATA (Czjzek) (7) 



Plate 14, figures 1 a-c 



Rotalina reticulata Czjzek, Haidinger's Nat. Abhandl., vol. 2, 1848, p. 145 



pi. 13. figs. 7-8. 

 Siphonina reticulata Brown, Lethaea Geognostica, ed. 3, vol. 3, 1853-1856, 



p. 227, pi. 35, figs. 23 a-c. — Cushman, Proc. U. S. Nat. Mus., vol. 72, 



art. 20, 1927, p. 7, pi. 1, figs. 1, 2; pi. 3, fig. 4. 

 Siphonina fimbriata Reuss, Denkschr. Akad. Wiss. Wien, 1849, p. 372, pi. 47, 



fig. 6. 



Test nearly equally biconvex, somewhat compressed, periphery 

 angled; usually four chambers in the last-formed volution, only 

 slightly inflated; sutures depressed slightly on the ventral side, radial, 

 on the dorsal side curved, strongly marked by the fimbriation of the 

 periphery of the chambers; aperture elliptical, with a distinct lip and 

 well marked, contracted neck. 



Diameter, 0.50 mm.; thickness, 0.25-0.30 mm. 



The various references to this species cover several different species, 

 and when no figures are given, it is very difficult to make sure of the 

 correct identification. From the Atlantic coast of Europe there are 

 several references to this species as follows : off Island of Jersey ; ^° off 

 Southport, England; off Kinsale, County Cork, Ireland and off 

 Portugal ; ^Wery rare, poor and worn, Bognor, Sussex, England; ^^ 

 two typical examples. So. Cornwall, England; ^^ off West Africa. ^* 



« Proc. U. S. Nat. Mus., vol. 72, Art. 20, 1927, pp. 1-16, pis. 1^. 



^ Halkyard, Trans. Manchester Micr. Sec, 1889, p. 70. 



" Chaster, First Rep't. Southport Soc. Nat. Scl., 1890-91 (1892), p. 66, pi. 1, flg. 16. 



" Earland, Journ. Qupkett Mier. Club, ser. 2, vol. 9, 1905, p. 226. 



" Heron-Allen and Earland, Journ. Roy. Micr. Soc, 1916, p. 51. 



« Egger, Abhandl. kon. bay. Akad. Wiss. Munchen, Cl.II, vol. 18, 1893, p. 402, pi. 16, figs. 42-44. 



