Mr. A. W. Waters on Australian Bryozoa. 83 



ever, to be three types, namely : — those nearly round, as 

 C. BusTcii [fusca and sacculata), G. pusilla, G. delicafula, G. 

 cornuta, G. elegans, C. perforata, G. formosa, G. crystallina, 

 C. Hannafordii, G. insignis, G. umbonata, G. taurina ; this 

 includes the vittatce of Busk, many having the ovicells cen- 

 tral, but this is not universal, G. cornuta, G. perforata, and G. 

 taurina having them terminal or geminate. The second type, 

 including G. amphora, G. ventricosa, G. intermedia, G. lorica, 

 G. Jiastata, G. alata, G. carinata, G. Wilsoni, G. pulchella, G. 

 vrnula, and G. margaritacea, has the operculum straight 

 below or concave, and corresponds nearly with Mr. Busk's 

 fenesti-ate group, having the ovicells usually terminal ; but 

 this is not the case in G. carinata. The next type has a 

 triangular operculum, and perhaps should again be divided 

 into [a) the small species, G. aurita, G. geminata (see fig. 22), 

 and fossil G. Iceviguta, Waters, and C. longicollis, W., with 

 a sinus in the aperture, for which MacGillivray has proposed 

 the genus Glaviporella ; this leaves (5) the large ones, G. 

 ponder osa, G. ornata (see fig. 21), G. solida^ W., and per- 

 haps these should be called Galpidium. 



It has seemed to me that the terminology in general use 

 was not sufficient for describing the Gatenicellce, and there- 

 fore when dealing with the fossils, where we have only indi- 

 vidual beads or internodes to examine, I suggested ('' Chilost. 

 Bry. from Muddy Creek &c.," Quart. Journ. Geol. Soc. 

 vol. xxxix. p. 428) that we should call each bead a " globulus," 

 again disting;uishing those with two zooecia as " biglobuli." 

 In G. ornata there are more than two zooecia, and this is 

 also the case in an interesting fossil from Curdie's Creek, 

 where the internode or multiglobulus has several zooecia 

 arranged in a bicellate series (Quart. Journ. Geol. Soc. 

 vol. xxxvii. p. 318, pi. xvi. figs. 78, 79). 



I also (Quart. Journ. Geol. Soc. vol. xxxix. p. 428) sug- 

 gested that in the fenestrate division we should distinguish 

 the compartments surrounding the zooecium as " supra-avicu- 

 larian," '^ avicularian," " infra-avicularian," and "pedal." 

 These are most typically represented in G. alata ; whereas in 

 the first type (namely those with rounded apertures) some of 

 the compartments, even when distinguishable, are very rudi- 

 mentary. 



The mandibles, again, are not of much use, as they are very 

 similar in most of the species examined. In all these there 

 is a comparatively large part in the centre consisting of only 

 one layer and nearly transparent ; and as the position of this 

 part varies in the mandibles of many of the Bryozoa and is 



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