60 MARINE POLYZOA. 



9. MEMBRANIPORA CALPENSIS, n. sp.? PI. CIV. figs. 5, 6. 

 Front of cell oval, elongated ; margins elevated, smooth ; an- 

 terior surface of cell punctate. 



Hab. Bay of Gibraltar, M ( Andrew, Landsborough. Egean Sea, 

 E. Forbes. On fuci, shells and stones, and sometimes scarcely 

 attached to anything. 



A fine and, apparently, abundant species which I am unable 

 positively to reconcile with any published description, and there- 

 fore venture to assign a name to. It seems at present to be con- 

 fined to the Mediterranean, but no figure at all approaching it 

 occurs among those of Savigny, unless it be that of Flustra La- 

 treillei, pi. 14. fig. 8. 



10. MEMBRANIPORA STENOSTOMA, n. s. PL C. fig. 1. 



Front of cell pyriform ; margins elevated, smooth, not grooved; 

 surface of cell smooth, or subgranular, a long spine on each side 

 of the mouth, which is very narrow. Avicularia scattered over 

 the polyzoary ; mandible triangular acute. 

 Hab. Tasmania, Mrs. Smith (W. Thompson). East Falkland 



Islands, 4 to 10 fathoms, Darwin. 



11. MEMBRANIPORA CERVICORNIS, n. s. PI. C. fig. 3. 



Front of cell oblong or oval ; a strong and much-projecting 

 process arising from each upper angle of the aperture, branching 

 like a stag's horn and bending over the front of the cell, usually 

 meeting and inosculating ; several other simple or forked, mar- 

 ginal spines. Ovicell galeate, crowned with a small avicularium ? 



Hab. ? 



This very curious species is at once distinguishable by the pro- 

 cesses on each side of the upper part of the cell, which, project- 

 ing at a right angle, branch out in the manner of the antlers of a 

 stag, and usually uniting in front by one or more of the branches, 

 cover and protect the open front of the cell in a very effectual 

 manner. The colour of the polyzoary is purplish. 



12. MEMBRANIPORA LACROIXII. PL LXIX. PL CIV. fig. 1. 



Front of cell oval, either entirely occupied by a membrane, or 

 partially filled in by a calcareous, granulated expansion all round 

 the circumference, but wider inferiorly; margin granulated; 

 usually an avicularium on either side below the aperture, and oc- 

 casionally a marginal spine (usually obsolete or worn off) on each 

 side above. 



