172 MICROPORID^. 



Megapora ringens. Busk. 



Plate XXII. fig. 1. 



Lepralia ringens, Busk, Quart. Journ. Micr. Sc. iv. (1856), Zoophytol. 308, 

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

 1868, 307. 



Megapora ringens, Hinc/cs, Ann. N. H. ser. 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. Ooecia 

 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. — Microporidae. 



MrCROPORiD.E, Smitt, Floridan Bryozoa. 

 Membraniporid^ (part.), Busk. 



Zo(ecia with the front wall irhoUy calcareovs ; margins 

 elevated. 



This family is distinguished by the total disappearance of 



