BRYOZOAN FAUNA OF VINCENTOWN LIMESAND 81 



Measurements. — 



„, . fZs=0.75 mm. . (Aa=0.14mm. 



Zooecium| fe = a6 _ ()>7 mm A Pe rtura { ?a =o.l2-0.14 mm . 



12 zooecia in 4 sq. mm. 



Variations. — The frontal and the ovicell are frequently covered by 

 a second pellicle identical with the first which may be totally or 

 partially developed. 



Occurrence. — Vincentown limesand : Mullica Hill, N.J. (Gabb and 

 Horn); not uncommon at Vincentown, N.J.; rare at Noxontown 

 Millpond, Del. 



Plesiotype.—TJ.S.NM. No. 52608. 



Family HIPPOPODINIDAE Levinsen, 1909 

 Genus HIPPALIOSINA Canu, 1918 



HIPPALIOSINA ASPERA Gabb and Horn. 1862 



Plate 15, Figuee 1 



1862. Reptocelleporaria aspcra Gabb and Horn, Journ. Acad. Nat. Sci. Phila- 

 delphia, ser. 2, vol. 5, p. 131, pi. 19, fig. 14. 



1901. Lepralia svbplana Ulricii, Maryland Geol. Surv., Eocene, vol. 1, p. 219, 

 pi. 59, fig. 17. 



1907. Lepralia aspera Ulrich and Bassler, in Weller, Geol. Surv. New Jersey, 

 Paleontology, vol. 4, p. 352, pi. 26, fig. 9 (bibliography). 



1920. Menizcopora subplana Canu and Bassler, TJ.S.Nat.Mus. Bull. 106, p. 556, 

 pi. 2, figs. 4, 5. 



Description. — The zoarium is creeping, multilamellar, surrounding 

 small fragments and pebbles. The lamellae are superposed. The 

 zooecia are distinct, separated by a shallow furrow or by a thread, 

 small, little elongated, oval or elliptical ; the frontal is a pleurocyst 

 reposing on a nonperf orated olocyst ; it is granulose, decorated with 

 false tremopores, and surrounded by rather large areolar pores. The 

 aperture is semielliptic, a little elongated with a proximal border 

 somewhat concave; the peristome is complete, very little salient, 

 often worn. The ovicell is endozooecial, narrow, somewhat convex, 

 smooth, little visible. On each side of the aperture there is a small 

 triangular avicularium, oblique, oriented distally toward the longi- 

 tudinal median axis of the zooecium. Distal dietellae present. 



Measurements. — 



ry . [Z3 = 0.5-0.54 mm. . fAa=0.144 mm. 



Zooecium Apertura \ 



[ ^ = 0.36-0.45 mm. l [fo = 0.12G mm. 



30-35 zooecia in 4 sq. mm. 

 Structure and variations. — The aspect of the frontal is quite 

 variable, the calcification being very irregular; it is frequently cov- 

 ered by false tremopores absolutely invisible on the interior of the 

 zooecium where the nonperforated olocyst alone is visible. 



