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



Plate 10:"), Figs. 3 and 4. 



URCEOLIPORA DENTATA (McG.)- 



[Genus URCEOLIPORA (McG.). (Sub-king. MoUusca. Class Polyzoa. Order Infundi- 

 bulata. Sub-order Cheilostomata. Fam. Bifaxariidse.) 



Gen. Char. — Zoarium continuous, irregularly branched. Zocecia alternate, in two series, 

 facing opposite ways, and each springing from the upper and posterior part of that immediately 

 preceding; oral opening facing directly or obliquely upwards, entirely occupied by the 

 operculum ; a slight ridge on each side of the zocecium, probahly indicating a shallow anterior 

 compartment,.] 



Description. — Zocecia arranged in a double series facing- opposite ways, 

 alternate, elongated, sub-cylindrical, lmt narrowed below and projecting in front ; 

 mouth terminal, oblique, lower margin straight, upper semicircular, with usually 

 five short, stiff spines. Ooecia large, smooth, imbedded in the front of the zocecium 

 above. 



Reference. — P. H. MacGillivray, Trans. Roy. Soc. Vict,, Nov. 1884. 



Port Phillip Heads, dredged by Mr. Wilson and myself. 



Forms small tufts about an inch high. The zooecia bear a 

 marked resemblance to those of Calwellia bicornis, although there 

 is not the same peculiar mode of connection. On the lower lip 

 there is on each side a minute mark or pit, and immediately beloAV 

 a small median pore. 



Explanation of Figures. 

 Platk 105. — Fig. 3, specimen, natural size. Fig. 3a, portion of the same, magnified. 

 Fig. 3b, two zocecia, more highly magnified. Fig. 4, small portion of another specimen, 

 mounted in balsam by 'Sir. Wilson, seen by transmitted light, showing two ocecia. 



Plate 105, Figs. 5-7. 



URCEOLIPORA NANA (McG.). 



Description. — Zocecia elongated, urceolate, mouth terminal, opening nearly 

 vertically upwards, lower lip hollowed, with a projecting, sub-triangular process on 

 each side, sometimes bearing a small avicularium. Ooecia with the surface minutely 

 cribriform or marked with radiating beaded lines. 



References. — P. H. MacGillivray, Trans. Roy. Soc. Vict. 1880; ? CaUymmo- 

 p/iord lucida, Busk, Challenger Polyzoa, p. 84, pi. xxxii., fig. 8. 



Port Phillip Heads. 



This species forms small, dichotomously branched, rigid tufts, 

 about half an inch high, growing on Retepora and other Polyzoa. 



C 19 ] 



