8 A MONOGRAPH OF THE TERTIARY POLYZOA OP VICTORIA. 



The systematic position of this form is doubtful. I think it most probable that 

 the clusters have originated from a creeping stolon as those of Liriozoa do. Of its 

 generic distinction there can be no doubt. 



Family Catenicellid^e. 



Zoarium phytoid, erect, branched, segmented, each internode consisting of a 

 single zocecium, or of two or three united laterally, or of a double series of irregular 

 number. Zooecia all facing the same way ; front entirely calcareous or membrano- 

 calcareous ; one or both margins (except in the central cell of the tricellular forms) 

 expanded in its whole length or only superiorly, and usually supporting in the upper 

 part a sessile or imbedded avicularium. 



In this peculiarly Australian family the genera already proposed are Catenicella, 

 Catenicellopsis, Claviporella, and Calpidium. Catenicella itself seems to me to require 

 further subdivision, and I would restrict the genus to those forms hitherto included 

 in Busk's fenestrate group. The Catenicellae vittatae I refer to a new genus, 

 Caloporella. For Wyville Thomson's C Harvey i, which he placed in a separate 

 division, the fasciatse, I would institute the genus Strophipora. I also propose the 

 genus Stenostomaria for the C. solida of Waters, and Ditaxipora for the same author's 

 C. intemodia. A form here first described seems to require still another generic 

 division for its reception, and I have accordingly named it Microstomaria. The 

 genus Catenicella was first proposed by De Blainville, but not in the sense now used, 

 and the species referred by him to it are now included in Hippothoa, Catenaria, 

 Eucratea. As already pointed out by Jullien (Cap Horn Bryozoaires, p. 1-4), it 

 was first properly defined by D'Orbigny (P.F.T.C. 43), and adopted by Busk and 

 others. D'Orbigny should clearly, therefore, be quoted as the authority for the 

 genus. The genera which I propose to adopt are Catenicella (D'Orb.), Stenostomaria 

 (n.g.), Strophipora (n.g.), Catenicellopsis (J. B. Wilson), Microstomaria (n.g.), 

 Claviporella (McG.), Ditaxipora (n.g.), and Calpidium (Busk). Catenicellopsis I 

 would restrict to C. pusilla, C. delicatida going to Caloporella, and Calpidium should 

 include C. ornatum (Busk), and Catenicella ponderosa (Goldstein). Catenicellopsis 

 and Calpidium have not as yet been found fossil. 



The expanded lateral processes consist normally of three compartments or 

 chambers, a central containing the avicularium, and a supra and infra-avicularian. 



Catenicella, D'Orbigny. 

 Branches originating from the summits of each of a geminate pair. Zooecia 

 usually in series of unicellular internodes, but at a bifurcation geminate, rarely 

 ( C gemella) each internode consisting of a geminate pair; front fenestrated, the 

 fenestra being simple and caused by a deficiency of calcareous matter or forming the 

 entrances to horizontal, usually elevated, tubes directed inwards towards the mesian 



