172 MICROPORID.E. 



MEOAPORA RINGENS, Busk. 



Plate XXII. fig. 1. 



LEPRALIA RINGENS, Busk, Quart. Journ. Micr. So. iv. (1856), Zoophytol. 308, 

 pi. ix. figs. 3-5 : Norman, Shetland Pol., Rep. Brit. Assoo. 

 1868, 307. 



MBGAPORA RINGENS, Hincks, Ann. N. H. er. 4, vol. xx. 529. 



Zocecia ovate, with an inclosed area, which occupies the 

 upper portion of the front surface; surface minutely 

 pitted ; orifice trifoliate, arched above, much contracted 

 below the middle, and expanded at the bottom into a 

 transverse fissure-like compartment, which is filled 

 in by a fixed horny plate, distinct from the movable 

 oral valve ; marginal spines 4-6 ; on the front or side 

 of the cell a tall corneous vibraculoid spine. Ocecia 

 small, globose, smooth, with a raised central rib passing 

 from the front margin backwards. 



Colonies growing in small inconspicuous patches of irre- 

 gular shape. 



HABITAT. On stones from deep water. 



LOCALITIES. Shetland (Barlee) : ibid., 80-170 fathoms 

 (A. M. N.). 



GEOGRAPHICAL DISTRIBUTION. Bergen (A. M. N.). 



Family IX. Microporidse. 



MKKOPORID.K, Snritt, Floridan Bryozoa. 

 MEMBRAMPORIDA (part.), Busk. 



with the front wall wholly calcareous; margin* 

 elevated. 



THIS family is distinguished by the total disappearance of 



