246 NATQKAL HISTORY OF 



colonies are of a pale olive-green or reddish-brown 

 colour. It is found at a depth of 40 — 170 fathoms. 



22, M. MiNAx, Bush. 



Hab. : Shetland [A. M. N.). 



Described by Mr. Busk in the Q. J. M. S., viii. (1860), 

 125. 



The cell is pyriform, with two long spines on each 

 side near the top, and a large pointed avicularium on 

 the margin at the bottom of the cell. 



23. M. NODULOSA, Hincks. 



Hab. : South Devon, Brixham {Hincks). 



This species is found on shells at a depth of 30 

 fathoms and over. The cells are oval, without spines 

 or any ornamentation. Below each is a prominent 

 boss or projection. 



Genus II. Megapoea, Hincks. (/xe7"9, large, and 

 TTopo^, an opening.) 



Zoariunfi incrusting. Zooecia with a depressed area 

 in front, surrounded by a raised margin, and partially 

 closed in by a calcareous lamina. Aperture trifoliate, 

 the lower portion filled in by a horny plate, on which 

 the opercular valve works. — T. H. 



1. M. EiNGENs, Busk. 



Lepralia ringens {Busk, A. M. N.) . 



Hab. : Shetland. 80—170 fathoms {A. M. N.). 



This species grows in small patches. The cells are 

 lai^ge and ovate, with " an inclosed area occupying the 

 upper portion of the front surface." There are about 

 6 spines on the upper margin, and there is a tall spine 

 on the side of the cell. 



It was described by Mr. Busk in the Q. J. M. S., iv. 

 (1856), 308. 



