214 Rev. T. Ilincks on British Pohjzoa. 



the area, with the exception of tlie two uppermost, which 

 stand erect ; an oval avicularium on a somewhat quadrate 

 area at the top of many of the cells, slanting upwards, with a 

 semicircular mandible : oocecium very small and inconspicu- 

 ous, smooth, elevated in front, forming a hood-like covering 

 over the extreme end of the cell. 



Colonies forming large, subcircular patches, with a some- 

 what lobate edge. 



Localities. Antrim {Hyndman)) Guernsey; off the Deadman, 

 Cornwall, 60 fathoms ; South Devon {T. H.). 



The massive, often subclavate spines, and the avicularium, 

 which is of the Flustrine type, distinguish this fine species 

 from the other spiniferous Membranijiorce, 



The name was suggested by the Rev. A. M. Norman, who 

 has also observed this form and recognized it as new. 



Genus Lepralia, Johnston. 

 Lepralia marmorea^ n. sp. 



Zoooecia ovate, short and rather broad, disposed in lines, 

 punctured round the ^d^^ ; surface coarsely granular ; orifice 

 suborbicular, with a loop-like sinus on the lower margin ; peri- 

 stome raised, not thickened ; a very broad plate or denticle set 

 deeply within the mouth ; a little below the orifice an elongate 

 avicularium, immersed, with a pointed mandible directed 

 downwards : oooecium ? 



Locality. Cornwall probably, on stone [T. LI.). 



The walls of the cells are thick, and the surface, which is 

 covered with rather large granules, has a somewhat polished 

 and marble-like appearance. 



Lagenipora, n. gen. 



Colonies consisting of a number of cells immersed in a 

 common calcareous crust: zoooecia decumbent, contiguous, the 

 front wall solid ; oral extremity produced, tubular, with a ter- 

 minal orifice. 



The chief characteristic of the genus is the common calca- 

 eous crust, in which the cells composing the colony are more 

 or less immersed. The zoarium is not a mere collection 

 of cells laid side by side in a certain order, but consists of a 

 calcareous matrix in which a number of zoooecia are imbedded, 

 and by which they are united into one commonwealth. The 

 cells themselves bear a close resemblance to those of Cylin- 

 droporella, but are destitute of the large tubular pore on the 

 front wall, which is so striking a character of the latter genus. 



