240 



cated willi :i \eiv smnll ;i\ iciilnriiiin. The [icdnl Inlciiil cliamlxT is icpii^scnUHl 

 by Iwo (nicnc seldom by tliici') mcinhriinous cavilics of soiiu'wlial vaiiahlc Ibriii 

 and size. 



Form of colony, ^\'llile uni- and i)i-zooecial inlciiiodes seem to alternate 

 regularly everywiuTi' in the ])rincipal branches, we may lind two hizod'cial inler- 

 nodes succeeding each other immediately on the proximal side of the ooicium. 



Of this species I have examined colonies from Port Phillip and from Port 

 Phillip Heads, Victoria (iMiss .lelly). 



Cribricella cribraria Busk. 



Catenicella cribraria Husk, ^'()yage of Rattlesnake, I, i)ag. ^51), (catalogue of Marine 



Polyzoa, Cheilostomata, i)ag. 9, PI. V, fig. 3 — 4, Challenger, Zoology, 



Vol. X, Part 1, pag. 11, lig. (5. 



(I'l. Xll, lif>s. 8 a— Sc). 



The zooecia broadly oval. The sternal area with numerous pores, of which 

 those situated in the margin are much larger than those scattered inside. The 

 aperture with a proximal concave margin, from the centre of which issues a 

 sutural line. This line separates two short, plale-shaj)e(l, hollow spines, which 

 are provided with snmll pores and may be strongly arched. There is a narrow, 

 curved transverse slit on the proximal side of the aperture. 



The lateral chambers. The scapular chamber is everywhere, also on the ad- 

 zoa'cial side of the daughter-zocecium, developed as a large, compressed avicu- 

 larium, the strongly concave frontal surface of which is bounded at both ends 

 by a process. The supra-scapular chamber, which is almost wholly calcified, is 

 long, narrow and provided with a curved terminal part. A very short lateral 

 branch ending in a pore starts from the proximal half of its frontal side and its 

 bent i)roximal end, which can be seen from the basal surface, likewise termin- 

 ates in an uncalcified portion. The infra-scaj)ular and the |)edal chambers are 

 well separated, long, narrow and provided with a longitudinal slit. An infra- 

 scapular, adzod'cial chamber is wanting in the mother-zoo'cium. 



The ocEcium. The gonozou>cium, which is twice as high as the covering 

 kenozoceciuni, is situated sometimes on a motber-zou'cium, sometimes on an in- 

 serted zod'cium. The sternal area is somewhat depressed and provided with 

 numerous scattered pores, of which the inner ones are in part larger than on the 

 zotrcium. The aperture has an almost straight jjroximal margin, and there are no 

 hollow spines. Two very narrow lateral chambers with a slil-likt' opening are 

 found along each lateral margin. The covering kenozod-cium has a distal, more 

 strongly arched, indistinctly marked portion and on each side a large, pear-shaped 



