348 CRETACEOUS PALEONTOLOGY. 



front of the aperture of each zocecium is a small, subcircular 

 avicularium. 



Remarks. This species may be easily distinguished from the 

 last by its somewhat larger size, by the different shape of the 

 zooecial apertures, and by the absence of pores in the external 

 zooec'ial walls. 



Formation and locality. Vincentown limesand, Vincentown 



(154). 

 Geographic distribution. New Jersey. 



Micropora ? vincentownensis Ulrich and Bassler n. sp. 

 Plate XXV., Fig. 9. 



Description. Zoarium encrusting. Zocecia about 0.5 mm. in 

 length, the width usually a little less than the length, more or 

 less regularly hexagonal in outline, with the anterior and 

 posterior sides shorter than the others. Zocecia bounded by shal- 

 low furrows, in the bottom of each of which is a very narrow, 

 slightly-elevated ridge. Zocecial apertures anterior in position 

 small, subcircular or transversely subelliptical in outline, the 

 posterior margin usually truncated, bordered by a rather thick, 

 moderately-elevated rim. Surface of the zooecia, back of the 

 apertures, covered with a thin, gently convex wall without per- 

 forations of any sort. 



Remarks. This species may be recognized by its encrusting 

 habit of growth, by the short and broad, hexagonal zocecia and 

 by the absence of perforations in the external zocecial wall. 



Formation and locality. Vincentown limesand, Vincentown 



(154). 



Geographic distribution. New Jersey. 



Family MIOROPORELLIDAE. 



Genus MiCROPOREivLA Hincks. 



Microporella sparsipora Ulrich and Bassler n. sp. 



Plate XXV., Fig. 8. 



Description. Zoarium encrusting. Zooecia more or less sub- 

 elliptical in outline, separated by rather distinctly depressed fur- 

 rows, arranged in a more or less irregular manner, from 0.4 to 0.5 



