MOLLUSCOIDEA. 315 



Genus Bere^nicea Lamark. 



Berenicea americana XJlrich and Bassler n. sp. 



Plate XX., Fig. 7. 



Description. — Zoarium incrusting, growing in more or less 

 irregular patches upon the surfaces of other bryozoa. Zooecia 

 contiguously arranged in moi-e or less regular spreading series, 

 each zooecium about .5 mm. in length and from .1 mm. to .13 

 mm. in width, the lateral boundaries sharply defined by im- 

 pressed grooves, the surface gently convex transversely. Zooecial 

 apertures nearly terminal, circular, a little narrower than the 

 zooecia, directed slightly forward, with a slightly elevated rim- 

 like border. 



Remarks. — This species cannot be confused with any associ- 

 ated bryozoan, the other American species of the genus being 

 mainly of Ordovician age. The species is particularly character- 

 ized by its small, narrow, elongate zooecia, with each zooecium 

 sharply marked laterally. 



Formation and locality. — Vincentown limesand, Vincentown 



(154). 



Geographic distrihwtion. — New Jersey. 



Genus Discosparsa d'Orbigny. 



Discosparsa varians TJlrich. 



Plate XXL, Figs. 1-2. 



1901. Discosparsa varians Ulrich, Md. Geol. Surv., Eocene, 

 p. 205, pi. 59, fig. 3. 



Description. — "Zoarium forming subcircular (yo-ung) or 

 irregular, undulating expansions, 2 to 10 mm. wide, parasitically 

 attached, or more or less free and epithecated beneath. In young 

 colonies which are often spread over the original layer, the 

 zooecial apertures, which are enclosed by moderately elevated, 

 ring-like peristomes, are, sometimes uniserially, but never very 

 regularly, arranged in a radial manner about the small, de- 

 pressed and smooth central space. In older examples, there are 



