General History of the Marine Polyzoa. 219 



below the top of the area and is supplemented by a broad 

 membranous extension, which closes in the upper part of 

 the cell. The prickly lobe on the lower margin is nearly 

 concealed by the membranous wall of the area, which over- 

 spreads it. 



Membranipora acuta, n. sp. (PI. VII. fig. 6.) 



Zooecia more or less distant and commonly separated by 

 reticulated interspaces, clavate or pyriform ; area regularly 

 oval, or elongate-oval, wholly covered in by membrane, 

 orifice at the very top of it, margin moderately raised and 

 very delicately beaded ; the cell produced below the area and 

 terminating in a pointed extremity (this is often concealed, 

 and the zooecium appears simply oval) ; at the summit of 

 each cell an avicularium } with triangular mandible, directed 

 upwards, borne on a tubercle, which often occupies the centre 

 of the reticulated interspace (PI. VII. fig. 6). Ocecium 

 rounded, about as broad as high ; surface smooth, a thickened 

 border round the oral arch, which is rather high and slightly 

 receding ; at the base of the ovicell and partly imbedded in it 

 one of the avicularian tubercles. 



Zoarium vitreous and subhyaline. 



Loc. New Zealand {Miss Jelly). 



The interspaces are frequently not reticulated, or very 

 slightly so. In some cases they are of large size and occu- 

 pied by a number of tubercles, with an orbicular orifice on the 

 summit ; the usual aviculiferous tubercle is also present. 

 Frequently a line passes backward from the oral arch of the 

 ooecium, and gives a somewhat bilobate appearance to the 

 front of it ; but this appearance is much exaggerated in the 

 figure (PI. VII. fig. 6, a). The pointed lower extremity of 

 the cell (PI. VII. fig. 6, b) is often concealed. 



Family Microporellidae. 

 MiCROPORELLA, Hincks. 



Microporella Malusii, Audouin, form disjuncta. 

 (PI. VII. fig. 4.) 

 Zooecia disjunct, each of them connected by very short pro- 

 cesses with six others ; surface smooth, glossy, and porcella- 

 neous ; one of the anterior oral spines frequently forked. 

 Loc. New Zealand {Miss Jelly). 



Microporella diodema, MacGillivray, form angustipora. 



(PI. VIII. fig. a.) 

 In this variety the pore is placed vertically, and is very 



