160 KtCOl.-l'S or THE Al Sll.-AI.IAN Ml. -KIM. 



a number of sa[»erfieial. iiiii- oi" iJiulti[Kirt)Us losette-plate.-^. uliich are most 

 often situated in tlie distal part of the /oteciinn. Tlie distal wall, wliicli is 

 bent from side to side, has a nunibei' of uni[>()rous or one nniltiporous 

 rosette-plate, while the distal half of each lateral wall lias a single multi- 

 porous plate. No iiririihiria. The stron«j;'lY pi'ojectiiiy hyperstomial 

 crrid, the aperture of Avhich may be closed by the zcdcinl operculum, 

 consist of two membianeous (chitinons ?) layei'S, between uliicli there is a 

 cryptocvst laver. wliicli spiinors fi-cnii the distal wall. free, branched 

 colctnies." 



The key to the art-nerfi of this family, accommodating l'nlhij,liH-riinii, 

 is thus j)resented. 



A. The t'uiiiptfii.satiuu sac opens outwards tlirou^^h a cve.sc-eutiL- asrojioiv. 



II. ']'he zouicium consists of three ditterent segments, a short jjro.xinial, a lou^' 

 stem-like middle, and a wideneil distal one. The opercidu\n may be com- 

 pound or simple Cahi-i'lli,i. 



h. The z<i<ecium does not consist of three ditt'ereut se^'ments. 



bii. A simple opercnlum. The ooecia with two prfiximal and free riti-like 

 processes Oiu-hoiiDi-n. 



III). A coniponml ojicrculnm. The 0(ecia without free rili-like }>rocesses. 



(hicliopori'lla. 



B. The compen.sation sac docs not open out waiils tlirouiih a |M.re. Imt iiiiiiiediattdy 



on tiie }>roximal side of the operciduiii. 



((. Wtthoiit pores Oii<hn^>o,-oiiles. 



h. With ]>ores I'ulln i,l,,eiiu.in. 



I'lil.i.Al'l.iiKClIM Ull.xiNI, sy.. ,n'i\ 



(Kis. J). 



J'ol //."ixiri/. — A free bniiKdiino- cdloii v, niiuh- n[> of intern(>des i>{ ten 

 to t welve zoo'cia '^itllated liack to hack. Inteniodes connected bv short 

 corneous tubes. 



I h'lnjinisls. — Zoo'cia pytifoiin. slightly calcilicd and covered bv a 

 closely adherins: membiane. The apeitnie is directed sidewavs, semior- 

 bicnlai' in shape and with a short spine at each side of the hollowed lower 

 bolder. The fronia i surface is covered by large ami irregularly placed 

 circular pores, and occasional small spine-like processes. Oa'cium globose, 

 situated above and continuous with the 7.o«vcium, a slioht suture showing 

 tiie line of dcnnircat ion. Aviciilaria >ibsent. 



('i<li<iir (in Canada Ralsam) brown. 



Lniidihl. — Uass Strait. Tasmania. 



Unlnl ilj>r nud I'n )iil ij (n' ill the Australian Miiseiim (r.^7"^aiid l'.S7'.*). 



