. The microscope and its revelations. appearance, and the skeletonwhen carefully examined is found to consist of the following pieces,as shown in fig. 686, l, b, b. the circlet of basal* supported on thetop of the stem ; r1, the circle o^first radials, now interposed betweenthe basals and the orals, and alternating with both ; between twoof these is interposed the single aval plate a ; whilst they supportthe second and the third raJials (r~, r;J), from the latter of whichthe bifurcating arms spring; finally, between the second radials wesee the five orals lifted from the basals on which they o
. The microscope and its revelations. appearance, and the skeletonwhen carefully examined is found to consist of the following pieces,as shown in fig. 686, l, b, b. the circlet of basal* supported on thetop of the stem ; r1, the circle o^first radials, now interposed betweenthe basals and the orals, and alternating with both ; between twoof these is interposed the single aval plate a ; whilst they supportthe second and the third raJials (r~, r;J), from the latter of whichthe bifurcating arms spring; finally, between the second radials wesee the five orals lifted from the basals on which they originallyre>ted by the interposition of the first radials. In the more advancedstage shown in fig. 686, 3, we find the highest joint of the stem 1 The pentaerinoid larva; of Aiitedon have been found abundantly (attached toseaweeds and zoophytes) at. Millport, on the Clyde, and in Lamlash Bay, Arran: inKirkwall Bay, Orkney; in Lough Straiigforcl, near Belfast, and in the liay of Cork ;and at Ilfraconibe and in Salrombe Bav, GiSr>.—Aiitcdu)! (Comatula), orseen from its aboral side. 9O2 ECHINODEKMA beginning to enlarge, to form the centro-dorsal plate (-2, c rf), fromwhich are beginning to spring the dorsal cirrhi (cir) that serve to
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmicrosc, bookyear1901
