DESCRIPTIONS OF BRYOZOA AND CORALS 



OF THE LOWER HELDERBERG GROUP. 



By JAMES HALL. 



[The title of this paper (and also one upon the Bryozoa and corals 

 of the upper Helderberg and Hamilton groups) was announced in 

 the 20th Keport on the State Cabinet of Natural History, the manu- 

 script having been prepared sometime previously. Owing to impera- 

 tive duties connected with the affairs of the museum, and the 

 rearrangement of collections, these papers together with others, the 

 titles of which were at that time or had been previously announced, 

 have been postponed from time to time, until in some cases the occa- 

 sion for their publication has passed. 



The present paper was again communicated with the Eeport of 

 1872 (in January, 1873), but its publication has been delayed by the 

 State Printer till 1874. Some of the papers which have been pre- 

 viously announced in the 18th, 19th and 20th Reports will appear 

 in this and subsequent Reports of the State Museum of Natural 

 History.] 



Genus FENESTELLA Lonsdale. 



Fenestella nervia n. sp. 

 Bryozoum forming funnel-shaped bodies, which are attached by 

 their bases to foreign substances, often to the branches of ramose 

 Bryozoans. Near the base the cup expands at an angle of about 

 seventy degrees, spreading more rapidly above and becoming undu- 

 lated or folded. Branches slender, approximate, about five in one- 

 tenth of an inch, frequently bifurcating ; sharply carinate on the out- 

 side, with a row of pores on each side of the carina, inside smooth 

 or slightly granulose, not striate ; dissepiments thickened, rounded, 

 widening at their junction with the branches ; surface on the same 

 plane with the branches on the inner side of the frond, deeply sunken 

 on the outer side. Fenestrules elongate, quadrangular on the outer 



