618 Scientific Proceedings, Royal Dublin Society. 



Flustra acanthina, Q,u. & Gaim. Lamarck. " Anim. sans ver- 

 tebres," ed. 2, torn, ii., p. 226. 



Membranipora spinosa, Busk. "Phil. Trans. Roy. Soc," vol. 

 clxviii. (extra), p. 195, PL X., fig. 3. 



Ampliiblestrum spinosum, Qu. & Gaim. (?) P. H. Mac Gillivray. 

 « Cat. Mar. Pol. Vict.," p. 20. 



Amphiblestrum ciliatum, Mac Gillivray. " Cat. Mar. Pol. 

 Vict.," p. 20. 



Lepralia judex, Kirkpatrick. " Ann. Mag. Nat. Hist." (6), 

 i., 1888, p. 78. 



Chaperia australis, Jullien. " Bull. Soc. Zool. France," vi., 

 1881, p. 163. 



By an oversight the specific name, " acanthina," given to the 

 species by Quoy & Gaimard, has been overlooked, "epineuse" 

 having been translated " spinosa" by later authors. 



Lamarck wrote " Cette espece nous parait appartenir au 

 genre Membranipora." 



Waters (" ' Challenger ' Supplementary Eeport, Polyzoa," 

 pp. 10, 11) objects to Jullien's genus, Chaperia, founded on the 

 presence of calcareous muscle plates inside the orifice, on the score 

 that these plates are found in other forms, which differ too widely 

 in other respects to be included under one genus. The thick, 

 well- developed operculum, present in this form, seems quite other 

 than a Membraniporidan characteristic. The species is included 

 provisionally under the genus Lepralia. 



Habitat. — Victoria, New South Wales, South Patagonia, Ker- 

 guelen Land, New Zealand, Falkland Island, Murray Island. 



Fossil. — Napier, New Zealand (Waters). 



Lepralia occlusa, Busk, var. areolata, nov. var. 

 (PI. xvi., fig. 7.) 



The zoarium forms thick nodulated encrusting masses. 



The zooecia are rhomboidal, and separated by raised lines ; at 

 first the front surface is uniformly punctured with round pores, and 

 later becomes covered with a thick areolated crust, the oval areola? 

 generally radiating from a central umbonate area. 



The lines bounding the zooecia form a prominent feature. 



The ooecium, in early stages, has a semi-elliptical membranous 



