New Lower Silurian Bryozoa. 173 



NEW LOWER SILURIAN BRYOZOA. 



BY E. O. ULRICH. 



(Read by title January 7, 1890.) 



The Bryozoa described in this paper are mainly from the Tren- 

 ton Shales ot Minnesota, where they were collected during the 

 month of October, 1887. All the specimens are in the author's 

 cabinet. 



vinella, n. gen. 



This genus is proposed for an adnate form supposed to be a 

 Ctenostomatous bryozoan, with relations to Vesicularia, Thompson, 

 and probably also to Mimosella, Hincks. 



Zoarium attached to foreign bodies (shells, etc.), consisting of 

 exceedingly slender, ramifying, thread-like tubes, occasionally 

 arranged in a radial manner. Surface of tubes often faintly lined 

 longitudinally. A row of widely separated small pores along the 

 center of the surface of the tubes. Zocecia unknown. Type, 

 Vinella rep ens, n. sp. 



As interpreted by me, the fossils for whose reception this genus 

 is proposed represent the stoloniferous part of the bryozoan only. 

 The zocecia I regard as having been deciduous, and developed by 

 budding from the creeping stolons at the points now represented 

 by the small pores. 



Named in honor of Mr. G. R. Vine, of England, who was the 

 first to suggest the relation of Rhopalonaria and Ascodictyon to the 

 Ctenostomatous Bryozoa. 



