Zoology.-] NATURAL HISTORY OF VICTORIA. [Polyzoa. 



Plate 148, Fig. 1.' 



CELLEPORA MEGASOMA (McG.). 



[Genus CELLEPORA (Fabricius). (Sub-kingdom Mollusca. Class Polyzoa. Order 

 Infundibulata. Sub-order Cheilostomata. Family Celleporidae.) 



Gen. Char.— Zoarium encrusting, partly adnate, massive, foliaceous, erect and ramose, or 

 glomerulous. Zooecia, in the older parts more or less erect and irregularly heaped together ; 

 one cr more rostral processes (occasionally absent), usually bearing avicularia, in the neighbour- 

 hood of the mouth. Generally scattered vicarious avicularia. J 



Description. — Zoarium encrusting'. Zocecia ovoid, irregularly arranged, fre- 

 quently bulging below, and with an imperfect umbo. Mouth arched above, about 

 a.-s high as wide, with a sinus in the lower lip. Scattered avicularia, frequently a 

 small one, with a nearly semicircular mandible, below or to one side of the mouth. 

 Ooecia large, rounded, granular or pitted. 



References. — P. H. MacGillivray, Lepralia megasoma, Prod. Zool. Vict., 

 plate 38, fig. 5; Cellepora megasoma, Trans. Roy. Soc. Vict., 1884. 



Port Phillip Heads. 



Forms an encrusting zoarium, occasionally of large size, one 

 specimen measuring 2 inches by 1^ inches. The marginal zocecia 

 are decumbent, and I believe it was a cluster of these that I 

 described as Lepralia megasoma. The others are more or less 

 elevated. There is no proper mucro. The surface of the zocecia 

 is normally smooth, but in portion of one specimen in which most 

 are so, a number have a series of longitudinal elevated ribs 

 extending the whole length. 



Explanation of Figure. 



Plate 148. — Fig. J, small group of zooecia, magnified, showing also two pitted ocecia ; the 

 oral sinus is not generally so sharply defined. 



Plate 148, Fig. 2. 



CELLEPORA COSTATA (McG.). 



Description. — Zoarium small, encrusting or attached to alga? or zoophytes. 

 Zocecia large, very irregular, mostly erect, surface strongly ribbed; mouth lofty, 

 arched above, with a deep rounded sinus in the lower lip; two or more stout, thick 

 processes at its sides, rounded at the summits and surmounted on the inner side by 

 a conspicuous oval avicularium. Ooecia rounded, with a mitriform or semicircular 

 sculptured area. 



Reference. — P. H. MacGillivray, Trans. Roy. Soc. Vict., 1868, 



[183] 



