00 PROCEEDINGS OF THE NATIONAL MUSEUM vol.87 



HEDEKOPSIS BIFURCATA. new species 



Plate 14, Figure 9 



This species forms regularly bifurcating expansions upon fenestellid 

 Bryozoa, composed of somewhat narrow elongate zooecia 3 to 4 mm. in 

 length and 0.35 mm. in width, with about 2 in 5 mm. Branching 

 occurs rather regularly at intervals of 5 or 6 mm., each branch con- 

 sisting of a main tube giving rise on alternate sides at distances of 2 

 mm. to new tubes at a low angle but remaining separate. The median 

 carina, although often not so well preserved in the tubes, is frequently 

 represented by traces in the form of an excavation. 



The narrow zooecia and the regularity of bifurcation of both branches 

 and tubes well characterize this species. 



Occurrence.— Onondaga (Upper Jeffersonville Umestone-^pm/er 

 acuminatus bed): Falls of the Ohio. 



Holotype.—U.S.NM. No. 87890. 



HEDEROPSIS CONNATA. new species 



Plate 14, Figure 10 



In this robust species the characteristic basal septum is well devel- 

 oped and the zooecial tubes are unusually large, their measurements 

 being 4 to 5 mm. in length and 1 mm. wide, with 1 to 2 in 5 mm. 

 Branching occurs rather regularly at intervals of about 6 mm. and angle 

 of 45°, each branch consisting of a broad expansion of 4 or 5 rows of 

 tubes and budding at 45°. The zooecia are usually in contact especi- 

 ally along the middle line. Budding occurs at close intervals on alter- 

 nate sides of the main axis, thus increasing the compact aspect of the 

 zoarium. 



The broad, solid, regularly dividing branches of long, wide, closely 

 arranged zooecia w^ell characterize this species. 



Occurrence. — Onondaga (Upper Jeffersonville limes tone->Spm/cr 

 acuminatus bed): Falls of the Ohio. 



Holotype.—V.S.'^M. No. 87891. 



HEDEROPSIS CURT A. new species 



Plate 14, Figure 7 



This neat species is characterized by its short, broad tubes with 

 erect, rounded apertures arranged in bihnear branches, wliich bifur- 

 cate at an angle of about 30° at intervals of about 6 mm. The first 

 zooecium of a branch is 3 mm. in length, but the following average only 

 l)i mm., although the width varies Httle from 0.66 mm. Budding 

 occurs not laterally as in Hederella but from the underside at an acute 

 angle, so that each zooecium overlaps the succeeding one. There are 

 2 to 3 zooecia in 5 mm., measuring along one side of the branch. 



