320 CRETACEOUS PALEONTOLOGY. 



about 0.2 mm. in width ; about five rows in 2.0 mm. Over the 

 basal part of the zoarium the zocecial apertures are covered one 

 after the other by the growth of the striato-punctate dorsal in- 

 tegument." (Ulrich.) 



Remarks. — "This handsome species is readily distinguished 

 from all others known to us having the character of Crisina, by 

 the frequent dichotomization of the branches. Differences in 

 cross-sections of the branches and in other respects are to be 

 observed when compared with most of the species." (Ulrich.) 



Formation and locality. — Vincentown limesand, Vincentown 



(154). 



Geographic distribution. — New Jersey, also Miocene of Mary- 

 land. 



Genus Bisidmonea d'Orbigny. 



Bisidmonea gabbiana Ulrich and Bassler n. sp. 



Plate XXII., Pigs. 1-2. 



Description. — Zoarium with dichotomously dividing branches 

 more or less quadrangular in cross-section, from .8 mm. to 3 

 mm. in thickness, carrying four series of zooecial apertures the 

 extremities of which upon the angles of the branches are either 

 alternate or opposite. Zooecial apertures three to five in each 

 series in contact laterally, subcircular, decreasing in size from 

 the outside to the center O'f each series. The series of zooecia 

 curving toward the growing ends of the branches with a gentle, 

 convex cirvature. 



Remarks. — Only the broken fragments of branches of this 

 species have been observed, the entire zoarium, however, was 

 probably small. The species is distinctly different fro-m' any of 

 the associated bryzoa and can be easily recoignized by its typically 

 quadrangular branches, each of the four faces of which bear a 

 series of curved, transverse rows of zooecial apertures. 



Formation and locality. — Vincentown limesand, Vincentown 



(154). 



Geographic distribution. — New Jersey. 



