26 



BULLETIN 104, UNITED STATES NATIONAL MUSEUM. 



BIGENERINA CYLINDKICA, new name. 



Plate 3, figs. 7, 8. 



Bigenerina digitata H. B. Brady (not d'Orbigny), Trans. Linn. Soc. I>ondon, 

 voL 24, 1864, p. 468, pL 48, fig. 8; Nat. Hist. Trans. Northumberland, vol. 1, 

 1865-67, p. 102, pi. 12, fig. 7.— Parker, Jones, and«H. B. Brady, Ann. 

 Mag. Nat. Hist., ser. 3, vol. 16, 1865, p. 28, pi. 2, fig. 61.— H. B. Brady, 

 Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 370, pi. 44, figs. 19-24; Journ. 

 Roy. Micr. Soc, 1887, p. 895.— Wright, Proc. Roy. Irish Acad., ser. 3, 

 vol. 1, 1891, p. 471.^Robertson, Trans. Nat. Hist. Soc. Glasgow, vol. 3, 

 pt. 3, 1892, p. 240. — FoRNASiNi, Mem. Acad. Sci. Bologna, ser. 5, vol. 10, 

 1901, p. 12.— CusHMAN, Bull. 71, U. S. Nat. Mus., pt. 2, 1911. p. 28, figs. 

 49a, b. — Heron-Allen and Earland, Trans. Linn. Soc. London, ser. 2, 

 vol. 11, 1916, p. 231. 



Description. — Test fusiform or cylindrical, elongate, rounded 

 in cross section, the early portion consisting of a number of chambers 

 arranged biserially, but circular in cross section; sutures somewhat 

 indistinct, apex bluntly rounded, later portion consisting of a number 

 of chambers arranged uniserially; division between the two portions 

 not marked by a difference in size; wall rather coarsely arenaceous, 

 but the particles neatly cemented with a reddish-brown cement to 

 form a nearly smooth surface; aperture rounded, small, usually in the 

 middle of the apertural face. 



Length 1.0-1.6 mm. 



Distribution. — This species which seems to be very common at 

 least in certain places off the northwestern coast of Europe and the 

 British Isles and elsewhere is not the same at all as d'Orbigny's 

 Modele. Brady and subsequently other authors following him have 

 referred this recent species to the name given by d'Orbigny for a 

 peculiar form from the Mediterranean. If the Modele is at all correct, 

 d'Orbigny's Gemmulina digitata is a very different thing. The 

 figures in the Challenger Report referred by Brady to Bigenerina 

 digitata are very characteristic of specimens which I have had through 

 the kindness of Mr. Joseph Wright from the dredgings of the Flying 

 Falcon, southwest of Ireland in 53 fathoms (97 meters). At this 

 station specimens are very abundant and except for certain minor 

 characters show very little variation in essentials. In all the western 

 Atlantic material that I have examined there seem to be nothing 

 which at all fits this European species. I have specimens in my own 

 collection from Log 8, Flying Falcon, 11 miles south of Glandore 

 Harbor, southwest of Ireland, 53 fathoms (97 meters) . 



Bigenerina eylindrica — material examined. 



