Zoology.] NATURAL HISTORY OF VICTORIA. • [Potgzoa. 



Plate 107, Fig. 3. 



CALPIDIUM PONDEROSUM (Goldstein sp.). 



[Genus CALPIDIUM (Busk). (Sub-kingd. Mollusca. Class Polyzoa. Order Infundibu- 

 lata. Sub-order Cbeilostotuata. Faui. Cateuicellida?.) 



Gen. Char. — Polyzoary phytoid, erect, brancbed ; brandies consisting of series of cells all 

 facing tbe same way, connected by corneous tubes ; eacb internode consisting of a single cell, 

 or of a median primary cell and a lateral, on one or botb sides, united side to side ; moutb 

 contracted about the lower third, its upper margin very prominent and projecting ; an avicu- 

 larium on each upper, angle of an internode.] 



Description. — Polyzoary consisting of long, strangling- branches; eacb inter- 

 node containing a single cell, or two laterally coalescent; cells elongated, narrow, 

 witb five fenestra? on tbe front of eacb; an avicnlarium at eacb upper angle of tbe 

 internodes; posterior surface witb a vertical baud, and two lateral pairs springing 

 from it ; ovicell large, galeate, terminal. 



Reference. — Catcnicclla ponderosa, Goldstein, Tr. Mic. Soc. Vict. 1880. 



Port Phillip Heads. 



Forms tufts of considerable size. The branches are much more 

 slender and straggling than in the next. Each internode usually 

 consists of only a single cell, but very frequently there is also a 

 coalescent one on the side. It is to be expected that a second 

 lateral cell sometimes occurs, hut I have not observed it in any of 

 the specimens examined. The cells are long, and narrower than in 

 C. ornatum. On the hack, in the single-celled internodes, there is 

 a vertical, thickened band, with a pair of similar hands extending 

 from its lower part obliquely upwards and outwards to the edge, 

 and another short pair going horizontally outwards from the 

 upper part. The arrangement of the bands in the double-celled 

 internodes varies. The ovicell is large, galeate, on the summit of 

 a terminal cell. The cell on which it is situated is narrower and 

 smaller than the others, and has the fenestra more elongated. 

 The posterior surface has some slightly elevated bands. The 



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