LAGENIPORA SOCIALIS. 235 



Genus LAGENIPORA, Hincks. 



Der. From lagena, a flask. 



Generic Character. — Colonies consisting of a number 

 of cells immersed in a common calcareous crust. Zocecia 

 decumbent, contiguous, lageniform ; oral extremity free, 

 tubular, with a terminal orbicular orifice. 



The leading characteristic of this genus is the common 

 calcareous crust, in which the cells composing the colony 

 are more or less immersed. The zoarium is not a mere 

 congeries of cells, laid side by side in a certain order, but 

 consists of a calcareous matrix, in which a number of 

 zocecia are imbedded, and by which they are united into 

 one commonwealth. The cells themselves bear a close 

 resemblance to those of Porina tubulosa, but are destitute 

 of the large tubular pore on the front wall, which is so 

 striking a character o£ the latter form. 



Lagenipora socialis, Hincks. 



Plate XXXIV. figs. 7, 8. 

 Lagenipora socialis, Hincks, Ann. N. H. for September 1877, 215. 



Crust whitish, granulated, of irregular figure. Zocecia 

 flask-shaped, the lower part immersed, the upper part 

 (in adult cells) produced into an erect tubular neck; 

 orifice circular, terminal, frequently with a number of 

 spinous processes on the upper margin ; surface gra- 

 nular, except on the erect portion, where it is smooth. 

 Ooecia small, rounded, smooth, set far back behind the 

 tubular neck of the cell. 



Colonies forming small, rather thick white crusts. 



