MARINE POLYZOA. (>i 



Flustra distans, Hassall, Ann. Nat. Hist. vii. 369 ; Johnst. Brit. 



Zooph. 350. pi. 57. figs. 11, 12. 

 ? Flustra hibernica, Hassall, Ann. 4* Ma#. Nfltf. ftarf. vi. 172. t. 7- 



fig. 1 ; vii. 3/0. 



? Lepralia pedilostoma, part., Johnst. Brit. Zooph. 315. 

 Membranipora merabranacea ?, Johnst. Brit. Zooph. 350. 

 Flustra Peachii, Couch, 9th Rep. Cornw. Polyt. Soc. 81. 

 Flustra Lacroixii, Savigny, Egypt, t. 10. fig. 9. 

 Flustra Savartii, And. Exp. i. 240; Savigny, Egypt. 1. 10. fig. 10. 

 Membranipora Peachii, Couch, Corn. Faun. iii. 120. t. 22. fig. 13. 

 Conopeum reticulum, Gray, List Brit. Rad. p. 108. 

 Hab. European Seas, common, spreading like a network over 



stones and dead shells. It occurs (?) also in Australia. 



This species, the identity of which with the Millepora reticulum 

 of Esper may be doubted, and which is certainly distinct from 

 what is described as Discopora reticulum in Lamarck (Hist. ii. 

 250. ed. 2), and probably therefore from the Membranipora reti- 

 culum of Blainville (Man. d'Actinol. 447), is indubitably the same 

 with Flustra Lacroixii, Audouin, and apparently also with the 

 succeeding figure of F. Savartii ; and I have therefore, in the un- 

 certainty of the older appellation of Esper, and at the same time 

 to avoid confusion with those of Lamarck and Blainville, adopted 

 that of Audouin, as the next in order of time, to the exclusion of 

 Dr. Hassall's name of F. distans, and Mr. Couch's of F. Peachii, 

 both of which doubtless refer to one and the same species. 



13. MEMBRANIPORA CYCLOPS, n. s. PL LXV. fig. 3. 



Front of cells oval ; margin very much raised, beaded ; a single 

 avicularium below the aperture. 



Hab. New Zealand. On fucus. 



Very much like the preceding, but differing in the single in- 

 stead of two avicularia below the aperture. 



14. MEMBRANIPORA MONOSTACHYS, n. s. PI. LXX. 



Cells distant in the younger portions of the polyzoary, attenu- 

 ated downwards, and disposed more or less in linear series. 

 Aperture oval ; margin thin, beaded or granular, a single acumi- 

 nate submarginal spine below the aperture. Scattered avicularia 

 over the polyzoary. 



Hab. Britain (east coast?). In the mouths of rivers and estua- 

 ries, or in brackish water, spreading upon shells and stones, 

 sometimes erect, free, foliaceous and contorted. 



This species, which has probably been confounded with M. 



