5S MARINE POLYZOA. 



figure in Plate LXXIII. is not good, as it is drawn from a spe- 

 cimen apparently without the oral spines, which usually exist in 

 and are in fact a prominent characteristic of the species. The 

 margin of the cells is scarcely raised, except in the older ones 

 in the centre of a patch, and the disposition towards a radiating 

 arrangement of the cells approximates this species, perhaps too 

 closely, to Lepralia. 



5. MEMBRANIPORA LINEATA. PI. LXI. fig. 1. 



Cells oval, separate, the margin armed with numerous slender 

 spines, erect or bent inwards. 

 Flustra lineata, Linn. Syst. 1301 ; Mull. Zool Dan. Prod. 253 ; 



Fabr. Faun. Grcenl. 437 ; Jameson, Wern. Mem. i. 563 ; Couch, 



Zooph. Cornw. 55; Corn. Faun. hi. 124 ; W. Thompson, Ann. 



Nat. Hist. v. 253; Johnst. Hist. Brit. Zooph. ed. 2. p. 349. 



t. 66. fig. 4, & p. 350. 



Flustra spinifera, Johnst. Trans. Newc. Soc. ii. 266. pi. 9. fig. 6. 

 Flustra hirta, Lamour. Corall. Ill ; Bosc, Vers, iii. 119 ; Risso, 



UEurop. Merid. v. 334. 



Callopora lineata, Gray, List Brit. Rad. p. 109. 

 Hab. European Seas; common; and according to Lamouroux 



it also occurs in Greenland, on stones, shells and fuel. 



Although some forms of Lep. nitida occasionally present a 

 considerable resemblance to this species, there can be no doubt 

 of their being perfectly distinct. 



6. MEMBRANIPORA FLEMINGII. PL LXI. fig. 2. PL 



LXXXIV. figs. 4, 5, 6. PL CIV. figs. 2, 3, 4. 



Front of cell ovate, very broad below ; margin thick, granular ; 

 front of cell partially filled in by a calcareous, granular expansion. 

 A projecting avicularium on each side below the margin of the 

 aperture, or sometimes one, in the centre ; 0-2-7 spines on the 

 upper margin of aperture. Ovicell galeate. 



Flustra meinbranacea, Mull. Zool. Dan. Prod. 253. no. 3054 ; 



Zool. Dan. iii. 63. t. 117- figs. 1,2; Fabr. Faun. Granl. 437 ; 



Lamour. Corall. 47 ; M.-Edw. Lamk. Hist. ed. 2. ii. 225 ; 



Blainv. Man. Act. 450. 

 Membranipora membranacea, Johnst. Hist. Brit. Zooph. ed. 2. 



p. 328. t. 56. fig. 7, & p. 478 ; not Blainv. Diet. Sc. Nat. 412. 

 Flustra unicornis, Flem, Edin. Phil. Journ. ii. 87 ; Flem. Brit. 



Anim. 236 ; Blainv. Act. 450 ; Johnst. Tr. Newc. Soc. ii.266. 

 Membranipora unicornis, Blainv. D. S. N. Ix. 412; Man. Act. 



447. 

 Flustra tuberculata, Johnst. Br. Zooph. 289; Bosc, Vers, iii. 143. 



