On Marine Polyzoa. 147 



XV. — Contributions towards a General History of the Marine 

 Folyzoa. By the Rev. Thomas Hincks, B.A., F.R.S. 



[Continued from vol. vi. p. 384.] 



[Plates VIII., IX., & X,] 



IV. FOREIGN MEMBRANIPORINA (second series) . 



a. With a membranous front wall. 



Membranipora coronata^ n. sp. 

 (PI. X. fig. 1.) 



Zocecia lozenge-shaped, contiguous ; area occupying the 

 whole front, with a membranous covering ; margin not much 

 elevated, except round the oral extremity, where it rises into 

 a hood-like screen, projecting slightly over the area and hol- 

 lowed out in front into an arch ; inner surface of the cell-wall 

 very strongly crenated and granulated.; immediately above 

 each zooecium an immersed avicidarium with acute man- 

 dible, placed transversely. Ovecium (?). Zoarium white and 

 shining. 



Loc. Singapore or the Philippines, on coral [Miss Jelly). 



The striking features of this pretty species are the crowning 

 avicularium, the very marked crenation of the border of the 

 cells, and the glossy whiteness of the whole zoarium. 



Membranipora terrifica^ n. sp. 

 (PI. VOL fig. 5.) 



Zooecia large, somewhat pyriform, arched above, widest in 

 the middle, narrowing off below the area ; area broad below, 

 slightly contracted towards the top, with a membranous covering, 

 occupying about two thirds of the front of the cell ; margin not 

 much elevated, thin, smooth ; the wall of the cell below the area 

 dense, uneven, punctured ; placed transversely along the 

 whole of the lower margin of the aperture, and projecting 

 praminently on the subjacent space, a gigantic avicularium^ 

 with long, narrow, curved beak, the basal portion much ex- 

 panded, with an angular projection on each side in the line of 

 the hinge ; mandible (probably) slender and setiform. 



Loc. Straits of Magellan, on Eschara flahellaris^ Busk 

 {Miss Gatty). 



Membranipora rubida, n. sp. 

 (PI. VIII. fig. 6.) 



ZooBcia somewhat pyriform, arched and expanded above, 

 below the area narrowing rather abruptly downwards ; area 



