2415 



cularium of very variable size, the distal wall of which terminates in a beaked 

 hook. This aviculariuni may sometimes attain the size of the zod^ciuni. The 

 supra-scapular chamber is separated frem the aviculariuni by a straight wall. It 

 is a compressed, roundedly triangular cavity, increasing outwards in height, which 

 is wholly calcified with exception of a narrow, oval fissure in the inner part of 

 its roof. The infra-scapular chamber is furnished with a righl-angled or acute- 

 angled corner, which forms almo.st a right angle with the frontal surface of the 

 aviculariuni. It is compressed, trapeziform and calcified wilh exceplion of the 

 surface forming an angle with the aviculariuni. On the adzoo'cial side of the 

 mother-zoa^cium proxinially lo Hie aviculariuni of the daughlcr-zod'cium (here is 

 a small supra-scapular chamber and on the proximal side of llu- lateral spine 

 we find an extremely small, rounded chamber, which must be regarded as Hie 

 adzooecial, infra-scapular chamber of the mother-zocecium. A pedal chamber 

 is wanting on (he daughter-zocecium, but found on both sides of Hie mother- 

 zott'cium. 



The ooecium. The gonozooeciuni is a mother-zocecium and differs from the 

 ordinary zoa-cia in wauling the two distal sjiincs and in liaving a broader sinus 

 in the aperture. The ooecium is covered by the distal zooecium, which is accord- 

 ingly provided on one side with a strongly arched expansion, the surface of which 

 has a number of scattered, wart-like i)i-ojecling pores. 



Form of colony, 'fhe principal branches are composed solely of bizooecial 

 internodes, in which the mother-zod'ciuni bears a considerably larger aviculariuni 

 than the daiigbter-zoa'cium and appears alternately to the right and to the left. 

 A single zod'cium may spring only from the daugliter-zo(i>cium. 



Of this .species I have seen a few fragments from Port Phillip. 



Claviporella aurita Busk. 



Catenicella aurita Busk, Catalogue of Marine Polyzoa, Cheilostomata, 



pag. 8, PI. IV, figs. 1, 2, 3. 



(PI. XX, fii^s. 10:1, 10 1)). 



The zooecia oval or angularly oval with very few, scattered, fine i)ores, and 

 wilh a sternal area provided with 3 — .') rather small fenestra'. The aperture, the 

 sinus of which is not longer than broad, is surrounded by 4 acropctalous spines 

 of very variable size, two distal and two lateral ones, of which the two former, 

 which diverge at a right or obtuse angle, are of a robust cylindrical form and 

 may become a little longer than the aperture. The two lateral ones are consider- 

 ablj' smaller and never seem to be wanting. A sulural line leads from the sinus 



Ui* 



