332 CRETACEOUS PAEEONTOLOGY. 



1864. BvRustra torta Meek, Check Eist Inv. Foss. N. A., Cret. 



and Jur., p. 3. 

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

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



pi. 60, fig. 7. 

 1905. BiHustra 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 moTe than 5 mm,., with from 6 to 10 rows 

 O'f 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 ap^tures usually about one-half the 

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

 the margins elevated anteriorly and laterally; the posterior sur- 

 face of the zocecia 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 cucuUate, 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 reco'gnized alsoi in the Eocene 

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

 mistaken by Lonsdale, and illustrated by him as an immature 

 fonn of Onfji'dhocello) 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. 



