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



Port Phillip Heads ; Portland, Mr. Maplestone. 



Luxuriant specimens attain a height of about 3 inches. Each 

 large branch divides dichotomously, the resulting ramification 

 forming a flabelliform expansion. The various branches of each 

 group are joined by transverse flexible tubes, which are attached 

 at either end to vibracula. At the lower end of the branches, 

 however, many, instead of connecting with other branches, attach 

 the zoarium to the object on which it grows in the same manner as 

 ordinary radical tubes. The avicularia are usually crowded, and 

 of large size towards the growing extremities of the branches, 

 being less frequent or wanting on the older. The mandible is 

 broadly triangular, nearly equilateral. The vibracular groove 

 does not extend beyond the cell with which the vibraculum is 

 connected, and therefore does not- cross the mesian line. I have 

 not seen the ooeciuin ; but Mr. Busk (Challenge?' Polyzoa, p. 25) 

 describes it as " subglobose, crowned with a sessile avicularium, 

 and having a broad elliptical membranous area in front." 



Explanation of Figures. 



Plate 136. — Fig. 3, specimen, natural size. Fig. 3a, front view of portion of same, magni- 

 fied. Fig. 3b, posterior view of same. 



Plate 136, Fig. 4. 



CANDA TENUIS (McG.). 



Description. — Brandies very slender, straggling-. Zocecia elongated, a spine 

 on each side above; margins thick and crenulated, lamina granular; aperture 

 elliptical, occupying about two-thirds of the front. Avicuhiria with the mandible 

 narrow and triangular. Vibracular groove extending beyond the median line. 

 Connecting' tubes long- and slender. 



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



Port Phillip Heads. 



Readily distinguished from C. aracknoicles by its much smaller 

 size, more slender and straggling branches, which do not grow so 

 much in one plane, narrower and more pointed avicularian 



C 139 ] 



