A treatise on zoology . )almee>i have been referred to this genus,but bek)ng to (p. 73) Dijjloporita. Pilovystis^Lapillocydisj and Aauitlioriftitis^ Cambrian, andlUicidocystU^ Ordovician, Bohemia, all describedby Barrande, are probably referable to this orderif not to this family. Lodanclla, Kayser (1885),Lowest Devonian, Germany, though called )onge, is very like (dlix. Peutocifstis, Barr.(1887), Ordovician, Bohemia (Fig. VIL), is dis-tinguished fiom Andociiatiti by the greater irregu-larity in si/e of the thecal plates (comparable tothe ariangement of plates in the carapace of somefxt
A treatise on zoology . )almee>i have been referred to this genus,but bek)ng to (p. 73) Dijjloporita. Pilovystis^Lapillocydisj and Aauitlioriftitis^ Cambrian, andlUicidocystU^ Ordovician, Bohemia, all describedby Barrande, are probably referable to this orderif not to this family. Lodanclla, Kayser (1885),Lowest Devonian, Germany, though called )onge, is very like (dlix. Peutocifstis, Barr.(1887), Ordovician, Bohemia (Fig. VIL), is dis-tinguished fiom Andociiatiti by the greater irregu-larity in si/e of the thecal plates (comparable tothe ariangement of plates in the carapace of somefxtinct edentates, Ulyptodontidae), and by the nil tlie ••videiice of liHrrando, abseucc of an indcjxndeut gonojxMc, this having III. , II. li. lietteriiiK iiH ill <• 1 •.! ii ii .111. ,ij^ li luHcd either with the anus or willi tln hydropore. There are signs of liy tlu aboral end of tilt theca (7*), wiirrt the plat«S are larger and tend to lii in rows. The. Ilu. tiuHlrnlux, lOMtoied THE CYSTJDEA 47 mouth {U) is surrounded by live lar^c plates, loiiuin;^ a slight projectiou,soiuevvliat eccentric. Jlie anal pyramid (/U-) has five plates. Tlie liydro-pore p/), a little to the i-iglit ol the line joining mouth and anus, wascovered by a snuUl pyramid of three phites, the impressions of whichon the internal cast (the only part preserved) have been regarded as threeopenings. The canals in the thecal plates are more numerous near theirnuirgins. Certain species, in which the plates seem more rounded, notclosely apposed, and perhaps without canals, in which the anal pyramidhad four plates, and in which the hydropore was not tripartite {ix. had novalvular plates),have been separated by Haeckel (1896) as a genus, Awphora-cystis. Pirocydix, Barrande (1887), Ordovician,Bohemia (Fig. VIII.), had a pear-shaped theca trun-cate below for fixation (St), but still without truestem. The anal pyramid had six plates (As); other-wise it was much
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishe, booksubjectzoology
