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



Plate 138, Fig. 10. 

 GEMELLIPORA STRIATULA (Smitt). 



[Genus GEMELLIPORA (Smitt). (Sub-kingdom Mollusca. Class Polyzoa. Order In- 

 fundibulata. Sub-order Cheilostomata. Family Escharidse.) 



Gen. Char. — Zoarium crustaceous, or erect and ramose. Moutb borse-sboe-shaped or 

 pyriform, with a prominent denticle on eacb side for the articulation of tbe operculum ; the 

 lower lip with a deep sinus.] 



Description. — Zoarium encrusting-. Zooecia irregularly shaped, elongated, 

 usually attenuated downwards or pyriform, arranged more or less in linear series, 

 distinct, very slightly prominent; surface glassy, marked with irregular, mostly 

 transverse, fine strise, and thickly punctate with small white-hordered pores ; mouth 

 horse-shoe-shaped above, with a large wide sinus below; at the junction of the sinus 

 and upper part there is a prominent, sharp denticle on each side for the articulation 

 of the operculum; a small, broadly-oval avicularium on a separate punctured area 

 above the mouth. Ocecium large, slightly elevated, adpressed to the cell above, 

 punctate, and with an avicularium on the summit. 



Reference. — Smitt, Floridan Bryozoa, Part ii., p. 37 ; Lepralia striatula, 

 P. H. MacGillivray, Tr. Roy. Soc. Vict., July 1882. 



Port Phillip Heads, on Adeonella, &c. 



Forms thin silvery films on old zoaria of Adeonellopsis mu- 

 cronata, Australis. and other calcareous polyzoa. Besides the 

 small avicularia above the mouth and on the ocecia, there are occa- 

 sionally others, precisely similar, situated at the summits of closed 

 cells where there is no appearance of there ever having been an 

 orifice. The special tracts in which the supra-oral avicularia are 

 situated are evidentlv of the same nature as these closed cells. 



Explanation of Figures. 



Plate 138. — Fig. 10, portion of specimen, magnified, showing two ocecia. Fig. 10a, 

 portion of zocecium, more highly magnified, to show tbe structure of the mouth. 



The specimens and descriptions of the Polyzoa on this plate 

 are from Mr. MacGillivray. 



Frederick McCoy. 

 C 150 ] 



