BRYOZOAN FAUNA OF VINCENTOWN LIMESAND 71 



Family HIPPOTHOIDAE Levinsen, 1909 

 Genus HIPPOTHOA (Lamouroux, 1821) Hincks, 1880 



HIPPOTHOA TENUICHORDA Ulrich and Bassler, 1907 



Plate 18, Figure 1 



1907. Stomatopora temnicliorda (typographical error for tenuichorda) Ulrich 

 and Bassler, in Weller, Geol. Surv. New Jersey, Paleontology, vol. 4, p. 314, 

 pl. 20, figs. 5, 6. 



Description. — The zoarium is adnate, frequently branching, con- 

 sisting of uniserially arranged zooecia. The zooecia are elongate- 

 pyriform, or club-shaped, 0.45 to 0.75 mm in length, about 0.2 

 mm in width at the posterior extremity, increasing very gradually 

 in size through about one half their length, and then somewhat 

 abruptly to about 0.15 mm at the rounded anterior end. The aper- 

 ture is nearly terminal, circular, with a slightly elevated rimlike 

 border, from 0.035 mm to 0.05 mm in diameter. 



Affinities. — This minute species is difficult to study because of the 

 small dimensions of the aperture and of its extreme fragility. It 

 is rarely well preserved in our specimens. However, with strong 

 magnification it is possible to see the proximal sinus characteristic 

 of the genus Hippothoa. On the other hand, we have not yet dis- 

 covered the ovicelled zooecia. 



It is necessary to await the discovery of better specimens in order 

 to classify generically this species more exactly. 



Occurence. — Vincentown limesand: Rare at Vincentown, N.J. 



Holotype.— U.S.N.M. No. 52618. 



Genus DACRYOPORA Lang, 1914 



DACRYOPORA(?) ORBIFERA, new species 



Plate 17, Figure 1 



Description. — The zoarium is uniserial and encrusts the debris of 

 shells. The zooecia are small, elliptical, terminated abruptly by a 

 narrow caudal portion shorter than the zooecium; the frontal is 

 quite convex, finely punctate, ornamented by a large transversely 

 submedian and transverse wrinkle. The aperture is orbicular; the 

 peristome is thin, very salient. The branches are dichotomous; their 

 angle of divergence is variable. 



Measurements. — 



rj . \Ls = 0.4-0.5 mm. . |7m = 0.05 mm. 



Zooecmm{ Apertura , _ AK 



[Zs = 0.13 mm. r [/a =0.05 mm. 



Affinities. — In the genus Dacryopora Lang, 1914, the aperture is 



semicircular and not orbicular, so that our generic reference is then 



