BRYOZOAN FAUNA OF VINCENTOWN LIMESAND 33 



In Flustrella capistrata Gabb and Horn, the zoarinm is free, 

 branching dichotomously, formed of 4 to 8 longitudinal rows of 

 zooecia, prismatic, claviform or compressed. The zooecia are dis- 

 tinct, separated by a deep furrow, elongated, elliptical; the mural 

 rim is salient, thin, smooth, without spines; the cryptocyst is shal- 

 low, short, concave, enlarged at the base. The opesium is elongated, 

 pyriform. The ovicell is hyperstomial, never closed by the opercu- 

 lum, globular, smooth. There is an auriform vibraculum (?) in each 

 angle of junction of the zooecia between them. 



„ . fZs = 0.3-0.4 mm. „ . (Ae> = 0.15 mm. 



Zooecia ^ 7 AO Opesium , „ , 



[As = 0.2 mm. l [A? = 0.1 mm. 



The zooecial structure is practically identical with that of Amphi- 

 blestrum abortivum, even to the smallest detail. There are, how- 

 ever, some small differences that should be noted, namely, the ab- 

 sence of gymnocyst, of aborted zooecia, and of small crescents on the 

 ovicell, and opesium somewhat smaller. Ulrich and Bassler, 1907, 

 considered Flustrella capistrata as the free form of Amphiblestrum 

 abortivum, and the discovery of encrusting specimens with free ex- 

 pansions arising from them proves the identity of the two. 



Occurrence. — Vincentown limesand : Timber Creek, near Mullica 

 Hill (Gabb and Horn) ; both the incrusting form and the free 

 branches are not uncommon at Vincentown and near Blackwoods- 

 town, N.J. 



Plesiotypes.— U.S.N.M. Nos. 73880, 73S81. 



Genus EURITINA Canu, 1900 



EURITINA TORTA Gabb and Horn, 1862 



Plate 6, Figures 3, 4 



1862. BifJustra torta Gabb and Horn, Journ. Acad. Nat. Sci. Philadelphia, 



ser. 2, vol. 5, p. 152, pi. 20, fig. 36. 

 1907. Biflustra torta Ulrich and Bassler, in Weller, Geol. Surv. New Jersey, 



Paleontology, vol. 4. p. 331, pi. 23, figs. 11, 12 (bibliography). 

 1920. Euritina torta Canu and Bassler, U.S.Nat. Mus. Bull. 106, p. 257, pi. 5, 



fig. 16 (bibliography). 



Description: — The zoarium is free, bilamellar, formed of undu- 

 lated fronds, narrow or wide. The zooecia are distinct, separated by 

 their adjacent mural rims, very elongated, subrectangular; the mural 

 rim is thin, salient; the cryptocyst is deep, smooth, oblique, with three 

 distinct faces ; the opesium is terminal, elliptical, regular. The ony- 

 chocellaria are fusiform, acuminated distally, generally primoserial ; 

 the cryptocyst is shallow, flat, smooth. The ovicell is hyperstomial. 

 cucullate, semiglobular with proximal border fringed and carinated 

 longitudinally; the posterior margin of the domelike covering ex- 

 tends backward to the anterior margin of the zooecial aperture just 

 behind. 



