Zoology.'] NATURAL BISTORT OF VICTORIA. [Polyzoa. 



Plate 105, Fia. 1. 

 CELLARIA RIGIDA (McG.). 



[Genus CELLARIA (Lamx.) = SALICORNARIA (Cuviku). (Sub-Mngd. Mollusca. 

 Class Polyzoa: Order Infundibulata. Sub-order Cheilostomata. Fam. Salicornariidse.) 



Gen. Char. — Zoarium simple or branched, cylindrical, with the zoucoia arranged around an 

 imaginary axis.] 



Description. — Polyzonry regularly dichotomously branched; branches cylin- 

 drical, slightly arcuate, usually enlarging- upwards; zocecia mostly rhomboidal, 

 pointed above and below ; mouth in the upper half, lofty, slightly contracted 

 towards the straight lower lip ; operculum with, on each side, a cervicorn mark, 

 and posteriorly a projecting, somewhat wedge-shaped process for the attachment 

 of the occlusor muscles. Avicularium very large, replacing a cell ; mandible of 

 great size, nearly semicircular. Ovarian cells rounded above, narrowed below ; the 

 pore semilunar at the extreme upper end of the cell, with the lower edge usually 

 projecting and smooth or obscurely crenulate. 



References. — P. H. MacGillivray, Trans. Roy. Soc. Vict. 1884; Salicomaria 

 simplex, Busk, Challenger Polyzoa, p. 88, pi. xxxiii., f. 8. 



Port Phillip Heads, usually on Dictyopora. 



This fine species forms tufts 1 to 3 inches high. The articula- 

 tions are frequently rigid from calcification. The internodes 

 are thick and usually slightly curved. The zocecia are nearly 

 regularly rhomboidal ; the ovarian ones broad and rounded above 

 and narrowed below. The mouth is situated in the upper half, 

 the lower lip corresponding to about the middle of the zooecium ; 

 deep in the interior are two sharp, stout, calcareous denticles from 

 each of the upper and lower margins, directed vertically upwards 

 and downwards. The operculum is very peculiar ; it has a large 

 cervicorn mark on each side, and the occlusor muscles are 

 attached to projecting, wedge-shaped processes. The avicularium 

 is of great size, replacing a cell ; the upper margin projects much 

 forwards, and the mandible is very large, nearly semicircular, and 

 directed upwards. The ovarian pores are mostly semilunar, 

 situated close to the upper margin of the zooecium, and about the 

 same width as the mouth ; the lower edge projects upwards as a 

 sort of lip, which is either smooth or very faintly crenulate. 



In Decade V., pi. 49, I described a form of Cellaria as 

 C. Jistulosa, var. australis. Having subsequently, through the 



Vol. II.— Decade XL— d. 17 ] 



