Mr. G. Busk on three new species of Polyzoa. 83 



surrounded with a somewhat thickened margin, beset with minute 

 verrucosities. There is a row of from three to five small openings 

 towards the outer border of the cell on the back, and the upper 

 and outer angle in front supports a minute upright spine, which 

 is however not unfrequently wholly wanting. There are no 

 moveable appendages. The ovarian cells are rounded and affixed 

 above the cell to which they belong, and immediately behind the 

 upper margin of the mouth, which in that case is slightly de- 

 pressed. Their external surface is marked by lines crossing each 

 other obliquely and giving it a tessellated aspect. The mouth of 

 the cell is filled up by a delicate transparent membrane (more or 

 less calcareous ?), in the upper part of which is situated the 

 small crescentic orifice, protected below by a projecting and pro- 

 bably moveable labium as in others of this class. 



EXPLANATION OF PLATE VIII. 



Fig. 1. Front view of a portion of a branch of C. Peachii. 



Pig. 2. Ditto to show an ovai-ian cell (a). 



Fig. 3. Back view of a portion of a branch : a, a, a, a, the series of holes. 



Fig. 4. Side view of the mouth of a cell. 



For the sake of comparison I have added some figures of the true C. ne- 

 ritina, and drawn to the same scale as the others, in order more distinctly 

 and briefly to show the difference between it and the new species. 



Fig. 5. Front view of a portion of a branch of C neritina {Acamarchis tie- 



ritina, Lamx.). 

 Fig. 6. a, an ovarian cell. 

 Fig. 7- Back view of a portion of a branch. 



II. 



For the following species, which I believe to be also new to 

 the British fauna and hitherto altogether unnoticed, I am in- 

 debted to Prof. E. Forbes. It was dredged on the coast in the 

 neighbourhood of Dartmouth. It also occurs among some zo- 

 ophytes collected on the coast of Spain, or in the Mediterranean, 

 by Mr. M' Andrew in the course of last year. 



Its very close resemblance to Scrupocellaria scruposa may have 

 caused it to be overlooked, and it may therefore be more gene- 

 rally distributed than at present appears. 



Genus Scrupocellaria. 

 Sp. S. scrupea (Busk). 

 S. cellulis rhomboideis; supra infraque truncatis; postice sinuatis. 

 Ore subovali margine paullulum incrassato ; spinis 4 vel 5 

 superne armato. Operculo pedunculato reniformi obtecto. 

 Ovariis cucuUatis subappressis, Isevibus. 



Hab. Dartmouth. Mare Mediterraneum. 



In stating the form of the cells in this genus, it is more con- 



6* 



