60 BULLETIN 16 5, UNITED STATES NATIONAL MUSEUM 



counting them and observing the transverse arrangement of the 

 primoserial avicularia it is easy to prove that their presence and 

 position are nearly constant. 



The apertural bar rises to the level of the ovicell and thus pro- 

 tects its orifice. If the frontal were covered with an ectocyst, the 

 opercular valve would be thin and flexible. 



Affinities. — Because of the number of avicularia we ought to 

 place this species in Phractoporella Lang, 1916; but there is no 

 epicalcification as in that genus. The number of avicularia (2 in- 

 stead of 3 or 4) and the presence of the pelma in place of the 

 pelmatidia do not permit us to place it in Polycephalopora Lang, 

 1916. We must hesitate, but in taking account of the other char- 

 acters — avicularia, ovicell, and costules — it is undoubted that this 

 species is a Polycephalopora. Moreover, the genera Phractoporella 

 and Coelopora could well be united, and we do not believe that a 

 special genus should be created for an avicularium or less. Neither 

 of these genera has been yet discovered in the Danian. This species 

 is well characterized by its orbicular frontal area. The avicularia 

 are identical with those of Callopora jerseyensis Ulrich and Bassler, 

 1907. They have the same form and are oriented transversely when 

 they are primoserial. The ovicells have also the same oval form. 



Occurrence. — Vincentown limesand : Not rare at Vincentown, N.J. 



C oty pes.— V.S.^.M. No. 73920. 



Genus ANORNITHOPORA Lang, 1916 



ANORNITHOPORA (?) FRAGILIS, new species 



Plate 12, Figures 5, 6 



Description. — The zoarium encrusts PUophloea sagena and shell 

 fragments. The zooecia are large, distinct, separated by a deep fur- 

 row, elliptical, broad, elongated; the frontal is convex, fragile, and 

 formed of 14 to 16 costules, which are broad, separated from one 

 another by a long lateral and a small median lacuna ; the line of 

 fusion outlines a small elliptical median area; the apertural bar is 

 distinct, wide, smooth. The apertura is terminal, transverse, semi- 

 circular; the distal peristome is thin, salient, and decorated by two 

 large proximal tuberosities. The ovicell is hyperstomial, closed by 

 the operculum, buried in the distal zooecium, globular, small, smooth. 



Me asuremen ts. — 



ry . \Lz = 0.72 mm. . (Aa=0.11 mm. 



Zooecium a ,k Ak . Apertura, Ai0 



[7s=0.45-0.54 mm. r |Za=0.18 mm. 



Affmities. — In the classification of Lang, we do not know exactly 



where to place this species, for we have been able to discern neither 



