332 CRETACEOUS PALEONTOLOGY. 



1864. Biflustra torta Meek, Check List Inv. Foss. N. A., Cret. 



and Jur., p. 3. 



1868. Biflustra torta Con., Cook's Geol. N. J., p. 722. 

 1901. Biflustra torta Ulrich, Md. Geol. Surv., Eocene, p. 214, 



pi. 60, fig. 7. 

 1905. Biflustra torta Johns., Proc. Acad. Nat. Sci. Phil, 1905, 



P- 5- 



Description. Zoarium consisting of bifoliate, compressed, 

 more or less twisted, bifurcating branches, which rarely continue 

 in the same plane for more than 5 mm., with from 6 to 10 rows 

 of zooecia on each side, except below the points of bifurcation, 

 where there may be a larger number of rows. Zooecia arranged 

 in longitudinal lines, and usually in quincunx, usually about .3 

 mm. in length. Zocecial apertures usually about one-half the 

 length of the zocecium, subelliptical in outline, placed anteriority, 

 the margins elevated anteriorly and laterally; the posterior sur- 

 face of the zooecia sloping downward from the elevated border of 

 the one next behind to the posterior margin of the aperture. 

 Ovicells usually absent, and only rarely present in any consider- 

 able numbers ; they are cucullate, semi-globular in form, with 

 the opening directed posteriorly ; the posterior margin of the 

 dome-like covering extends backward to the anterior margin of 

 the zocecial aperture just behind. Avicularia scattered irregularly 

 among the other zooecia, of which they are but modified in- 

 dividuals about two-thirds of the usual size. 



Remarks. Besides its occurrence in the Cretaceous beds of 

 New Jersey, this species has been recognized also in the Eocene 

 of Maryland. It is rather common form, and was apparently 

 mistaken by Lonsdale, and illustrated by him as an immature 

 form of Onychocella digitata (Mort). These two forms, how- 

 ever, are distinctly different. 



Formation and locality. Vincentown limesand, Vincentown 

 (154), Timber Creek and near Mullica Hill (Gabb and Horn). 



Geographic distribution. New Jersey; also Eocene of Mary- 

 land. 



