LAGEN1PORA SOCIALIS. 235 



Genus LAGENIPORA, Hincks. 



Dor. 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 

 zooecia 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 of the latter form. 



LAGENIPORA SOCIALIS, Hincks. 



Plate XXXIV. figs. 7, 8. 

 LAGEMPORA SOCIALIS, Hincks, Ann. N. H. for September 1877, 215. 



Crust whitish, granulated, of irregular figure. Zocecta 

 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. 

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

 tubular neck of the cell. 



Colonies forming small, rather thick white crusts. 



