Mr. A. W. Waters on Australian Bryozoa. 87 



Botany Bay. Fossil : Bird Bock, and Waurn Ponds (Vic- 

 toria) . 



6i Catenicella Bushii, W. Thorns. (PL IV. fig. 12.) 



Catenicella Buskii, Thomson, " On new Genera and Species of Polyzoa," 

 Zool. Bot. Assoc. Dublin, vol. i. 1859, p. 83, pi. viii. fig. 2 ; MacG. 

 Zool. Vict. dec. iii. p. 24, pi. xxiv. fig. 12. 



Catenicella fiisca, MacG. loc. cit. dec. ix. p. 33, pi. xc. fig. 1. 



This is closely allied to C. gibbosa, and should perhaps 

 only be considered a variety. The relationship to elegans is 

 evident, but how close is somewhat uncertain, as Busk says 

 of elegans " ovicell geminate," whereas MacGillivray says 

 ovicell like that of Buskii. 



Operculum 0*02 millim. wide. 



Loc. Western Australia; Bass's Straits; QueensclifF; La 

 P^rouse, Botany Bay, washed on shore. 



6. Catenicella delicatula (Wilson). (PI. IV. fig. 11.) 



Catenicellopsis delicatula, J. B. Wilson, " On a new Genus of Polyzoa," 

 Micr. Soc. Victoria, vol. i. no. 2, p. 65, pi. iv. fig. 2 ; MacGillivray, 

 Zool. Vict. dec. xi. p. 30, pi. cvii. tig. 2. 



I cannot see that this should be separated from Catenicella 

 merely on account of the branches sometimes originating 

 from the sides of the cells. In a specimen from Queenscliff 

 the increase is usually by means of geminate globuli ; but 

 there are many which spring out of the side of others and 

 are attached by a chitinous tube. I have a specimen of C. 

 Hannafordi in which a new branch starts from the front of 

 a globulus in a similar way ; and w^e also see the same mode 

 of increase in Menipea crystallina, Didymia simplex, &c., and 

 this should make us hesitate before adopting a new genus. 

 And as supporting this and showing that Catenicellopsis 

 should not be separated on account of its mode of growth, I 

 may mention that in my specimens of C. pusilla the zooecia 

 do not spring laterally from the others. 



In the small specimens from La Perouse none of the 

 globuli originate laterally from the others. There are nume- 

 rous chitinous tubes starting either from the back or the front 

 and united into bundles which become more massive near 

 the base ; besides these there are isolated ones springing 

 from the dorsal surface and ending in grappling-hooks. 



Operculum nearly round, with muscular attachments at 

 each side, placed about one third of the distance between the 

 proximal and distal edges. 



Loc. Living : Spring Creek ; Port Phillip Heads ; Sor- 



