BRYOZOAN FAUNA OF VINCENTOWN LIMESAND 53 



is complete, with a thick, proximal border and six spines on the 

 distal border. The ovicell is hyperstomial, closed by the operculum, 

 globular, smooth. Avicularia sporadic. 



Measurements. — 



„ . fZs = 0.5mm. . (7ia=0.03mm. 



Zooecia|, „ oc Apertural, . . „ 



|fo = 0.35mm. r [Za=0.05mm. 



11 zooecia in 1 sq. mm. 



Structure. — Here, as in other species of the genus, there is no 

 separate apertural bar, for it is joined to the peristome, of which 

 it thus constitutes the proximal lip. 



The general aspect is that of Cribrilaria radiata Moll, 1803, from 

 the Recent seas. Certain secondary decorations on the costules ap- 

 pear to be the only difference. The genotype itself, Reptescharella 

 pygmaea D'Orbigny, 1852, from the French Senonian, appears 

 simply to have a larger aperture. The constant form of the aperture 

 indicates a frontal covered by the ectocyst and a much chitinized 

 operculum. 



Occurrence. — Vincentown limesand : Very rare at Vincentown, N.J. 



Holotype.— U.S.N.M. No. 73918. 



Family PELMATOPORIDAE Lang, 1916 



Genus RHINIOPORA Lang, 1916 



RHINIOPORA TUBULOSA, new species 



Plate 12, Figures 2, 3 



Description. — The zoarium encrusts C oscinwpleura and the debris 

 of shells; oftenest it is a small, free, hollow tube probably covering 

 a small algal filament. The zooecia are distinct, separated by a fur- 

 row, large, elliptical, elongated; the frontal is convex, bearing 19 to 

 21 narrow, radiating costules, decorated with pelma and with pelma- 

 tidia and separated by rows of numerous vacuoles. The aperture 

 is terminal, semielliptical, transverse ; the apertural bar is wide, dis- 

 tinct, separated from the peristome, of the same nature as the cos- 

 tules ; the distal peristome is very thin, salient, with two short spines. 

 The ovicell is hyperstomial, closed by the operculum, large, globular, 

 smooth. In many of the interzooecial angles there is a small trian- 

 gular avicularium with a pivot, generally transverse. 



Measurements. — 



7 . \Lz = 0.72-0.81 mm. . \ha= 0.1Q mm. 



Zooecia 7 Apertura 7 AO 



ytz = 0.36-0.45 mm. L |Za=0.2 mm. 



13 zooecia in 4 sq. mm. 



Structure. — On the costules there are punctations, which Lang 



calls pelmatidia. The proximal punctation is frequently larger and 



constitutes then a pelma. 



