A treatise on zoology . ; illr, interbrachials ;jin, pinnulars. or IIIBr of a single arm. The small plates may increase in size andfirmly bind together the arms and rami (Fig. XXIV(/); thosebetween brachia are interbrachials (iBr); between IIBr, inter- secundibrachs (illBr), and so there are interambula-crals of various orders ; the ilAmb,merfrinjr at the sides of the thecainto the iBr; the illAmb separatedby the thecal cavity from ill Br;the illlAmb, und so on. Theinterbrachials sometimes, thoughlarely, descend between theradials. Not merely l)rachials,l>iit also ])innulars ma
A treatise on zoology . ; illr, interbrachials ;jin, pinnulars. or IIIBr of a single arm. The small plates may increase in size andfirmly bind together the arms and rami (Fig. XXIV(/); thosebetween brachia are interbrachials (iBr); between IIBr, inter- secundibrachs (illBr), and so there are interambula-crals of various orders ; the ilAmb,merfrinjr at the sides of the thecainto the iBr; the illAmb separatedby the thecal cavity from ill Br;the illlAmb, und so on. Theinterbrachials sometimes, thoughlarely, descend between theradials. Not merely l)rachials,l>iit also ])innulars may be incor-porated in the cup, and between])innules are developed interpin-mdars ( r7/j/(jr/7/i»/s, );it is often hard to distingniali fixed])innulars from sui)j)leinentary])lates. Kxce])t in jdinntive forms{rjj. lieteocrinidae), the inter])rachials havi; a simihir arrangementin ( interradius of an individual. li;deed, the arrangement oftenserves as a means of distinguisliing species and genera. iliis. IKJ. XXIVo. SininuHrinvs fX}KinniiH, to sliow incorpnrn-tion r»f arms into cup, l)y mwins of sccond-ury plates (these hitter are sliaded); forlettering see adjoining text. (From s|)ecimeu ^Tl IT.) X i|. THE CRINOIDEA 119
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishe, booksubjectzoology
