108 A MONOGRAPH OF TUB TKUTIARY POLYZOA OF VICTORIA. 



S.r. ; M.C. ; B. ; C.B. Living. Australia. 



Tlic sjx'ciinens arc not in a very g'ood condition, and only a few of the zocccia 

 shew the niark.s of tlic oral sjnncs. The one shewn in lig. 5 I Avas at first inclined to 

 refer to a dill'crent species, but I think it is only an early stage. In some of its 

 zoa^cia there is a row" of 6-8 spines on the np2)er edge of the thyrostonie. In niost 

 (here is no appearance of the internal denticles, but in one they are present. 



A^ar. nmnmularia, Busk. I'l. XIV., ligs. (5, 6ft, iSh, 6c, Tenison Woods, 

 T.K.S.V., 1861, p. 3 ; C. trideuticidata, Waters, Q.J.G.S., 1885, p. 306. 



In this variety the zoarium is discoid or dome-shaped, 10-20 millimetres in 

 diameter, and is formed of several superjjosed layers of zoa'cia. The overlajjping of 

 these is marked on the under surface by concentric rings, the zocecia themselves 

 being distinct and arranged in regular radiating series. In some of the largest 

 sjiccimens the posterior surface is very concave, and the zoarium has the appeai-ance 

 of that of a large Lunulites. In others, mostly smaller, the posterior surface is 

 convex, tlu; whole zoarivim being j^roportionately thicker and dome-shaped. 



S.P; B.E. ; C.B. ; G. 



3. C. /ossff, Haswell, sp. I'l. XIV., figs. 8, 9, 10. 



Sphuirophora fossa, Haswell, Proc. Linn. Soc. N.S.W., Vol. V., 1'2 ; Cellcpora 

 fussa, Waters, Q.J.G.S., 1881, p. 313; 1885, 307. 



Zoarium small, about tivc millimeters diameter, lenticular, more convex on one 

 side; in most specimens, on one side, one or more small deep round pits. Zocecia 

 confused, projecting forwards, rounded; thyrostonie arched above, straight and 

 entire below; a rounded a\'icularium on an ele\ation immediately below the 

 thyrostome. 



S.P.; B.R.; C.B. ; W.P. ; C.C. (W.). 



In most specimens there is a single pit on one side near the centre, in others 

 there are several, and occasionally they are absent. The suboral elevation is mostly 

 broken open, when it forms with the thyrostome a single large aperture divided by 

 a narrow cross-bar. In one specimen it is in most of the zoa^cia produced into a 

 slightly elevated conical process Avith a small o2)euing, evidently aAicularian, at 

 the summit. 



1. C. serrata, u.s]). PL XIV., lig. 7. 



Zoarium cireidar, convex above, flat or hollowed beloAv, Avitb a central pit on 

 the under surface. Zocecia irregularly arranged, rounded, siu-face granular ; 

 thyrostome arched above, contracted beloAv ; loAver lip straight, with about six shoi-t. 



