Art. IX. —Descriptions of Few, or Little Known, Polyzoa. 



Part II. 



By P. H. MacGillivray, M.A., M.R.C.S., F.L.S. 



(with theee plates.) 

 [Read 13th July, 1882.] 



Membraniporella distans, n. sp. Fig. 5. 



Cells remote, glistening ; costse, about eight or ten on a side, 

 expanded and perforated at their inner ends ; a narrow, 

 slightly raised line down the middle of the cell ; mouth 

 straight below, arched above, with several (2 — 5) blunt 

 spines round the upper margin; ovicell small, rounded, 

 smooth, with an elevated ridge across the front: 



Port Phillip Heads. 



This species is closely allied to M. nitida, of which it may 

 eventually prove to be only a variety. In the only specimen 

 I have seen, the cells are irregularly scattered over a small 

 fragment of Retepora ; some are contiguous, although most 

 are widely separated and arranged in no definite order. 

 The retepore is very dirty and rotten, and it is impossible to 

 make out the nature of the connection between the remote 

 cells. The ribs are generally expanded towards the mesial 

 extremity, and frequently there perforated. This is caused 

 by the ribs, in growing, dividing dichotomously towards the 

 inner part, and these divisions by again uniting, or by their 

 union with those of the opposite side, leaving the round or 

 oval openings. The ovicell is smaller and shallower than in 

 M . nitida, and has a slight ridge separating an area from 

 the smooth, round, superior part. 



Microporella renipuncta, n. sp. Fig. 1. 



Cells broadly ovate ; surface smooth, or faintly granular, 

 or areolated ; a large, reniform, punctate plate below the 

 mouth, toward the middle of the cell ; mouth straight 

 below, arched above, with four or five spines on the upper 



