48 BULLETIN 16 5, UNITED STATES NATIONAL MUSEUM 



united to the distal portion, The ovicell is hyperstomial, closed 



by the operculum, embedded in the distal zooecium, globular, smooth. 



Thin zooeciules terminated by an elliptical orifice, often primoserial, 



appear frequently between the zooecia. 



Measurements. — 



fZs=0.35mm. . . [k=0.05 mm. 

 Zooecia | fe = (m mm Aperturaj ^ Q5 ^ 



Zooeciules, 0.2 mm long. 

 12 zooecia in 1 sq. mm. 



Structure. — It is difficult to study this species, and it is necessary 

 to calcine it or color the zoarium in order to tone down its glossy 

 appearance. The usual magnification is too small to permit of 

 minute details, which usually disappear in the process of halftoning. 



The zooeciules are not avicularia, as Lang in 1921 believed. They 

 have the appearance of nanozooids of the cyclostomatous Bryozoa 

 so well described by Borg in 1928, which we have discovered in many 

 Recent cheilostomatous genera. 



Affinities. — It is difficult to distinguish between Lang's genera, 

 Nannopora, Tricolopora, Trilophopora, and Distansescharella D'Or- 

 bigny, 1852, because of the insignificance of the characters employed. 

 We have adopted the oldest of these names. 



Occurrence. — Vincentown limesand : Timber Creek, Vincentown, 

 and near Blackwoodstown, N.J. (rare). 



Plesiotype.— U.S.N. M. No. 73928. 



DISTANSESCHARELLA LATA, new species 



Plate 10, Figure 7 



Description. — The zoarium encrusts C oscinopleura and fragments 

 of shells. The zooecia are distinct, separated by a deep furrow, elon- 

 gated, almost fusiform, wide; the frontal is convex and formed of 

 four pairs of wide costules, flat, smooth, close together, little distinct 

 and placed below a wide apertural bar. The apertura is small, some- 

 what elongated, semielliptical, terminal, with two minute cardelles 

 placed below and a straight proximal border. The ovicell is hyper- 

 stomial, closed by the operculum, placed on the distal zooecium, 

 globular, smooth. The zooeciules, isolated or grouped, are narrow, 

 fusiform, and terminated by a small elliptical orifice. 

 Measurements. — 



. (Zs = 0.35-0.4 mm. . [ha= 0.05 mm. 



ZoOeC1 >=0.22-0.25 mm. A P^ ur >=0.08 mm. 

 Zooeciules, 0.15-0.2 mm long. 

 8 zooecia in 1 sq. mm. 

 Affinities. — There are probably apertural spines. We have not 

 observed the dietellae. 



