36 BULLETIN 16 5, UNITED STATES NATIONAL MUSEUM 



transverse, with very thin peristome. The apertural avicularium is 

 triangular, with a pivot, with salient and pointed beak, and oriented 

 obliquely. Ovicell and ancestrula unknown. 



Measurements. — 



„ . \Lz = 0.4—0.5 mm. . (Aa=0.05 mm. 



Zooecia \ 7 Apertura , 



|fe=0.2o-0.3 mm. [7a=0.1 mm. 



29 zooecia in 4 sq. mm. 



Affinities. — This is another typical species quite close to the geno- 

 type. It differs from Micropora ogivalina in its smaller dimen- 

 sions, its longer opesiules, and its triangular avicularium. 



Occurrence. — Vincentown limesand : Very rare at Noxontown 

 Millpond, Del. 



Holot?jpe.—U. S.'N.M. No. 73893. 



MICROPORA (?) CYLINDRACEA Ulrich and Bassler, 1907 



Plate 8, Figure 6 



1907. Micropora cylindracea Ulrich and Bassler, in Weller, Geol. Surv. New 

 Jersey, Paleontology, vol. 4, p. 347, pi. 25, fig. 4. 



The description of 1907 is correct. No additional specimens have 

 been discovered, and we continue in ignorance of the ovicell and the 

 base. 



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



Holotype.— U.S.N. M. No. 52604. 



MICROPORA (?) PULCHRA Ulrich and Bassler, 1907 



Plate S, Figure 5 



?1886. Vinculurkv sculpt a (?D'Orbigny) Pergens and Meunier, Ann. Soc. 



Malacol. Beige, vol. 21, p. 49 (fide Voigt). 

 ?1892. Steganoporella sculpta (?D'Orbigny) Hennig, Lunds Univ. Arsskr., vol. 



28, p. 35, pi. 1, fig. 20 (fide Voigt). 

 1907. Micropora pulchra Ulrich and Bassler, in Weller, Geol. Surv. New 



Jersey, Paleontology, vol. 4, p. 347, pi. 25, fig. 3. 

 1930. Micropora cf. pulchra Voigt, Leopoldina, vol. 6 r p. 476, pi. 24, fig. 20. 



Description. — The zoarium is free, bilamellar ; the fronds are nar- 

 row, dichotomous. The zooecia are distinct, separated by a deep 

 furrow, much elongated, quite narrow, subcylindrical, sinuous; the 

 mural rim is thick, salient, rounded; the cryptocyst is shallow, 

 slightly convex, finely perforated, without opesiules. The aper- 

 ture is terminal, semielliptical, transverse, with a proximal concave 

 lip independent of the mural rim. The ovicell is endozooecial, very 

 small, convex, smooth. The apertural avicularium is very small, 

 triangular, with pivot, with beak oriented perpendicularly to the 

 zooecia! plane. 



