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



2. Catemcella alata, W. Thomson. (PL IV. fig. 9.) 



Catenicella alata, W. Thorns., " On new Genera and Species of Polyzoa," 

 Zool. Bot. Assoc. Dublin, 1859, vol. i. p. 80, pi. vi. fig. 4; Mac- 

 Gillivray, Zool. Vict. dec. iii. p. 21, pi. xxiv. fig. 7 ; Waters, Quart. 

 Journ. Geol. Soc. vol. xxxvii. p. 817, pi. xyI. figs. 47, 49, 58, 

 vol. xxxvii. p. 260, vol. xxxix. p. 428, pl. xii. figs. 15, 16. 



The opercula are straight below, having a second layer in 

 the upper part, which is often divided down the centre. 



Miss Jelly submitted to me a closely allied Catenicella 

 from Port Phillip, which, from the general characters and 

 arrangements of the compartments, I at once pronounced to 

 be a variety of alata ; but every cell is geminate, with one 

 fresh globulus growing from the centre of one of the zooecia 

 of the previous globulus, first from the right, then from the 

 left, and so on. Between the two zooecia in the centre of the 

 globulus there is a small avicularium, and this is also the 

 case in the geminate cells of typical C. alata^ but is not a 

 common character in the Catenicellce. 



I mention this variety at some length, as we have the same 

 minute characters with two different modes of increase, and I 

 consider that this gives support to the view expressed that 

 the genus Catenicellopsis should be dropped. Since the 

 above was written, MacOillivray has called this C. gemella, 

 and therefore it should stand as C. alata, var. gemella. 



Loc. Recent : Bass's Straits, Port Fairy [Dawson) ; Queens- 

 clifi" ; Tasmania 5 New Zealand ; La Perouse, New South 

 Wales. Fossil : Mount Gambier ; Muddy Creek ; Bird 

 Eock ; and Waurn Ponds [W.). 



3. Catenicella ventricosa, Busk. (PI. IV. fig. 13.) 



Catenicella ventricosa, Busk, Cat. Mar. Polyz. p. 7, pl. ii. figs. 1, 2, pl. iii. 

 figs. 1-5; MacGiUivray, Zool. Vict. dec. iii. p. 18, pl. xxiv. fig. 3; 

 Waters, Quart. Joum. Geol. Soc. vol. xxxix. p. 431. 



Specimens from La Pdrouse have chitinous radicle-tubes 

 from the front and dorsal surface, and these ultimately form 

 very solid bundles. In one case, where there has evidently 

 been an accident, tubes connect the neighbouring cells, thus 

 saving the colony from injury. 



Loc. Bass's Straits ; Victoria ; Tasmania ; Port Fairy ; 

 New Zealand {Hutton) ; La Perouse, Botany Bay. Fossil : 

 Bird Rock (Victoria) . 



4. Catenicella hastata, B. (Pl. IV. fig. 10.) 

 Zoc, Bass's Straits ; Victoria ; New Zealand j La Perouse, 



