Zoology.-] NATURAL HISTORY OF VICTORIA. [Polyzoa 



Plate 146, Fig. 2. 



CATENICELLA URNULA (McG.). 



Description. — Zooecia vase-shaped ; mouth slightly hollowed below; anterior 

 surface with 7 large, shallow fenestra; lateral processes large, erect, sharply pointed, 

 frequently a small avicularium on the front of one or both, and a shallow hollow on 

 the superior surface. Posterior surface with a narrow, vertical, thickened band, from 

 which two processes extend on each side to the margin of the zocecium, leaving 

 three shallow depressions. Ocecia galeate, on the summit of zooecia. 



Reference. — P. H. MacGillivray, Trans. Roy. Soc. Vict., March 1886. 



Port Phillip Heads, Mr. J. B. Wilson. 



This species is of a dark reddish-brown colour, and attains a 

 large size, a tuft received from Mr. Wilson being 6 inches in height. 

 It is allied to C. plagiostoma and C. intermedia, but is readily 

 distinguished by its straight mouth, the shallowness of the fenestras, 

 the shape and structure of the avicularian processes, and the 

 markings on the back of the zooecia. The ocecia are large and 

 terminal. The ovicelligerous zocecium has a deep, rounded sinus 

 in the lower lip of the mouth, and a very large operculum ; the 

 upper margin of the mouth is bordered by a thick rim, above 

 which, on each side of the ocecium, is a broad depressed area. 

 The back of the ovicelligerous cell is smooth, separated by a raised 

 line from the ocecium, which has usually a transverse, elliptical 

 depression and two somewhat quadrate, superior spaces, separated 

 by raised bands. I have only examined dried specimens, and it is 

 possible that the depressed areas may, in the living state, be level 

 or even elevated. 



Explanation of Figures. 



Plate 146. — Fig. 2, front view of small portion of branch, magnified. Fig. 2a, back view 

 of same. 



Plate 146, Fig. 3. 



CATENICELLA GRACILENTA (McG.). 



Description. — Zooecia much elongated, very narrow ; mouth arched above and 

 slightly hollowed below, or sub-circular; anterior surface papillose, posterior smooth; 



[ 174] 



