SYSTEMATIC DESCRIPTIONS 



Order CHEILOSTOMATA Busk 



Suborder Anasca Levinsen 



Family BIFLUSTRIDAE Smitt, 1872 



Genus MEMBRANIPORA Blainville, 1830 



MEMBRANIPORA NELLIOIDES, new species 



Plate 1, Figures 2, 3 



Description. — The zoarium is articulated; the segments are small, 

 quadriserial. The zooecia are distinct, much elongated, separated 

 by a deep furrow, elliptical and provided with a proximal gymno- 

 cyst. The mural rim is quite thin at the top and much enlarged 

 at the base. The gymnocyst is covered by two avicularian chambers 

 symmetrically arranged; the avicularia, thus arranged in longi- 

 tudinal rows, are very salient, funnel-shaped, supplied with a pivot, 

 and their beak is oblique and slightly rounded at the extremity. 



Measurements.* — 



~ . f^ = 0.4 mm. „ . \Lz = 0.7 mm. 

 Opesium 7 ZooecmmL nK 



|/0 = O.15 mm. [lz = 0.25 mm. 



Affinities. — The structure of this species is identical with that of 

 Membranipora lusoria Waters, 1881, from the Miocene of Australia, 

 which has not been rediscovered. Since we have only two specimens 

 of Membranipora neUioides, it is impossible to classify the species 

 more definitely. It is possible that these two species belong to the 

 genus Nellia Busk, 1852. 



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



Cotypes.— U.S.N.M. No. 73859. 



Genus VINCULARIA Defrance, 1829 



VINCULARIA ACUTIROSTRIS. new species 



Plate 1, Figure 1 



Description. — The zoarium is free, vincular in form, pentagonal, 

 articulated. The zooecia are elongated, oval, arranged in longi- 

 tudinal series; the mural rim is thin, little salient; the proximal 

 cryptocyst is small, concave, smooth. The outer opesium is large 



4 In the citation of measurements, ho is the length and lo the width of the opesia, 

 Lz and Is similarly the length and width of the zooecia, Lv and Iv the same for the 

 vibraculum, Lon and Ion for the onychocellaria, ha and la for the apertura, etc. 



13 



