8 A MONOGRAPH OF TUE TERTIARY i'OLYZOA OF VICTORIA. 



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

 the clusters have orii^inatcd from a creeping stolon as those of Liriozoa do. Of its 

 ffeneric distinction tliere can l)c no doubt. 



Family Catenicellid.e. 



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

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

 number. Zocccia all taring the same way ; front entirely calcareous or membrano- 

 calcareous ; one or both mai'gins (except in the central cell of the tricellular f(.irms) 

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

 ])art a sessile or imbedded aviculariuni. 



In this peculiarly Australian family the genera already })roposed are Catcnicella, 

 Catenicello})sis, Claviporella, and Calpidium. Catcnicella 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 Catenicellai vittata? I refer t(j a new genus, 

 CiiloporcUd. For Wyville Thomson's C. Harijciji, which he j)laced in a separate 

 division, the fasciata^ I would institute the genus Stropliipora. I also propose the 

 genus Slci/ostoiiiaria for the C. sol/da of Waters, and DUaxlpoi'a for the same author's 

 C. infenio(l/((. A form here first described seems to require still another generic 

 di\ision for its reception, and I have accordingly named it Mlci'ostomarla. The 

 genus Catcnicella was first j^roposed by De Blainville, l)ut not in the sense now used, 

 and tlie species referred by liim to it are now included in Illppothoa, Catenarla, 

 J^ucrafca. As already jwinted out by Jullien (Cap Horn Brj^ozoaires, p. 1-4), it 

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

 other.s. D'Orbigny should clearly, therefore, be (juoted as the authority for the 

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

 (n.g.), Stroph'q)or(i (n.g.), Catenlcellopsls (J. B. Wilson), Illcrostotnaria (n.g.), 

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

 would restrict to C p/tsilla, C. delicatitla going to Caloporella, and Calpidium should 

 include C. onntlum (Busk), and Catenicella po)tderosa (Goldstein). Catenicellopsis 

 and Calpidium have not as yet been found fossil. 



The exj)anded lateral processes consist normally of three compartments or 

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



Catenicella, D'Orhigin/. 



Branches originating from the summits of each of a geminate pair. Zoox-ia 

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

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

 fenestras being sini pic and caused by a deficiency of calcareous matter or forming the 

 entrances to hoiizoiilal, usually elevated, tubes directed inwaids towards the mesian 



