110 



BULLETIN 71, UNITED STATES NATIONAL MUSEUM. 



CYCLAMMINA CANCELLATA H. B. Brady. 



"Nautiloid Lituola" W. B. Carpenter, The Microscope, 5th ed., 1875, p. 536, 



figs. 274a, o, c (in text). 

 Cyclammina cancellata H. B. Brady (MS.) in Norman, Proc. Roy. Soc. London, 



vol. 25, 1876, p. 214; Quart. Journ. Micr. Sci., vol. 19, 1879, p. 62; Rep. Voy. 



Challenger, Zoology, vol. 9, 1884, p. 351, pi. 37, figs. 8-16.— Agassiz, Bull. Mus. 



Comp. Zool., vol. 29, 1888, p. 164, figs. 498, 499 (in text).— J. Wright, Proc. 



Roy. Irish Acad., vol. 1, 1891, p. 470.— Chapman, Proc. Zool. Soc. London, 



1895, p. 18.— Goes, Bull. Mus. Comp. Zool., vol. 29, 1896, p. 32.— Flint, 



Rep. U. S. Nat. Mus., 1897 (1899), p. 282, pi. 27, fig. 3; pi. 28, fig. 1.— Bagg, 



Proc. U. S. Nat. Mus., vol. 34, 1908, p. 129. 

 Lituola canariensis Carter, Ann. Mag. Nat. Hist., ser. 4, vol. 19, 1877, p. 203, 



pi. 13, figs. 26-29. 



Description. — Test nautiloid, biconvex or slightly more convex at 

 one side, umbilicated, chambers numerous, averaging about thirteen 

 chambers in the last-formed coil, usually about three full coils in the 

 adult test; sutures seen from the side somewhat curved anteriorly in 



168 



169 



Figs. 168-170.— Cyclammina cancellata. X 16. from photograph. 169. apertural view, the 



MEGALOSPHERIC FORM OF THE SPECIES WITH FEWER CHAMBERS IN EACH WHORL, AND ATTAINING, WHEN 

 FULLY DEVELOPED, A SMALLER SIZE THAN THAT OF THE MICROSPHERIC FORM. 



the middle; exterior smooth and imperforate when perfect, interior 

 of the chambers labyrinthic, the structure thus formed almost or quite 

 filling the earlier developed chambers, peripheral edge of test rounded, 

 with little trace of depressions at the sutures of the chambers ; aper- 

 ture an elongated slit near the base of the apertural face, supplemented 

 by a series of pores occupying the central part of the apertural face, 

 often becoming very numerous in very large specimens ; color reddish- 

 brown. 



Diameter up to 6.5 mm. 



Distribution. — The Challenger obtained this species at stations 237 

 and 2,44 in the North Pacific east from Japan, in 1,875 and 2,900 

 fathoms. Goes records it from three Albatross stations off the coast 

 of Mexico, 660-995 fathoms. Bagg records it from two stations in 

 the vicinity of the Hawaiian Islands, 495 and 865 fathoms. Flint 



