{)78 MR. A. W. WATERS ON MEMBRANIPORID^. 



Membranipora lineata (i.)- (PI- 47. fig. 11 ; PI. 48. fig. 9.) 



Membranipora albida, Busk (peck's), Zool. Chall. Exp. pt. xxx. p. 63. 



Busk's M. alhida of the ' Challenger ' Eeport was for a long 

 time a great puzzle, as it seemed iu some respects to be closelj' 

 allied to M. curvirostris ; but as tbe figures and description did 

 not correspond, it was not until after an examination of the 

 ■' Challenger ' specimens that I was able to clear up the difficulty. 

 Busk had two quite distinct forms before him, and the one was 

 figured natural size, while the magnified figure is principally 

 taken from the other specimen. The present form from the 

 Azores has numerous spines round the border, say 10 on each 

 iside, and in having so large a number varies fi'om the European 

 M. lineata; the avicularia, however, are similar. 



Probably M. lineata will turn out to be only a northern form. 



The specimens from New South "Wales, which I considered 

 to be a variety, is the M. sejuncta of MacGillivray. Specimens 

 .-o named from New Zealand are not the M. lineata. Heller 

 mentions it from the Adriatic, but I have not seen it from any 

 Mediterranean locality. 



I have already alluded to the pointed teeth within the pore- 

 chamber, and give a figure to explain their position (PI. 48. 

 fig. 9). 



Loe. Station 75, Azores Q Challenger^). 



Membranipora eltjstroides, HincTcs. (PI. 49. fig. 12.) 



Membranipora flustroides, Hincks, Ann. Mag. Nat. Hist. ser. 4, vol. xx. 

 pp. 213, 214 ; Brit. Mar. Polyzoa, p. 151, pi. xix. fig. 2. 



Membranipora nodulifera, Hincks, Ann. Mag. Nat. Hist. ser. 5, vol. vi. 

 p. 71, pi. ix. %. 2. 



The specimens from Capri and Villefranche-sur-Mer have lost 

 the spines, and the zooecia are somewhat longer than those of the 

 British specimens, but the oval avicularia are in shape and 

 position similar. In a specimen in Mr. J. Tate Johnson's col- 

 lection from Madeira, the spines are not so broad as those figured 

 by Mr. Hincks, but neither are they in an undoubted M. flus- 

 troides sent to me by the Eev. A. M. Norman marked " Britain," 

 though in this specimen occasionally a broad one is seen. 



This approaches the Flustra type, and is closely allied to 

 M. lineata. 



Log. Britain, Capri, Villefranche-sur-Mer, Madeira. 



