BRYOZOAN FAUNA OF VINCENTOWN LIMESAND 39 



Genus MONOPORELLA Hincks, 1881 



MONOPORELLA (?) LATICELLA, new species 



Plate S, Figure 1 



Description. — The zoarium encrusts shell fragments. The zooecia 

 are distinct, separated b}' a salient thread, large, hexagonal, little 

 elongated; the frontal is smooth, convex, and bears two large ope- 

 siules placed above the transverse axis of the zooecium and removed 

 from the separating thread. The aperture is terminal, small sub- 

 circular or transversely subelliptical in outline, the posterior margin 

 usually truncated, bordered by a rather thick, moderately elevated 

 rim feebly indented laterally. Ovicell and ancestrula unknown. 



Measurements. — 



„ . [Lz = 0.8 mm. . [ha=0.l mm. 



Zooecia^ , nntf Apertura {, „ ., „ 



\Jz = 0.i5 mm. [m = 0.1o mm. 



11 or 12 zooecia in 4 sq. mm. 



Affinities. — Because of its olocystal frontal, this species cannot be 

 classed in Micropora, Mo?wporelIa, or Maoropora. In its exterior 

 aspect, in the form of the apertura, and in the size of the zooecia it 

 appears to be related to Monoporella, that is, to the Aspidostomidae. 



The opesiules are rarely visible ; almost always they disappear in 

 fossilization, and they have escaped previous observers. 



Micropora glabra Voigt, 1924, from the Upper Senonian of Ger- 

 many has a structure absolutely identical and should later be classed 

 in the same genus. The ovicell here is also unknown. 



Voigt, 1930, has outlined this new genus in creating the Micropora 

 erecta group. Unfortunately, this group lacks homogeneity, for no 

 opesiules have been noted on certain species, especially Cellepora 

 erecta Hagenow, 1846. 



Occurrence. — Vincentown limesand : Vincentown, N.J. (rare). 



Holotype,— U.S.N. M. No. 74466. 



MONOPORELLA(?) VINCENTOWNENSIS Ulrich and Bassler, 1907 



Plate 20, Figures 4-7 



1907. Micropora(l) rincentoic-nensis Ulrich and Bassler, in Weller, Geol. 

 Surv. New Jersey, Paleontology, vol. 4, p. 348, pi. 25, fig. 9. 



Description. — The zoarium encrusts the debris of shells, but prin- 

 cipally C oscinopleura digitata. The zooecia are distinct, separated 

 by a thin thread located at the bottom of a furrow, hexagonal, elon- 

 gated ; the frontal is convex, smooth, perforated by 2 small opesiules. 

 often covered with a tuberous pellicle, frequently ornamented with 

 two transverse lamellar expansions, placed between 2 apertures. The 

 apertura is semielliptical, transverse: the proximal border is linear, 



