. The microscope and its revelations. the curious and often very beau-tiful structures which represent, in the class Jfolothurioidea, the solidcalcareous skeleton of the classes already noticed. The greaternumber of the animals belonging to this order ai-e distinguished bythe flexibility and absence of of 1 heir envelopes ; and ex-cept inir in the case of the various species which have a set of cal-careous plates, disposed around the wall of the pharynx, we do not findamong them any representation, that is apparent to the unassistedeye. of thai skeleton which constitutes so distincti
. The microscope and its revelations. the curious and often very beau-tiful structures which represent, in the class Jfolothurioidea, the solidcalcareous skeleton of the classes already noticed. The greaternumber of the animals belonging to this order ai-e distinguished bythe flexibility and absence of of 1 heir envelopes ; and ex-cept inir in the case of the various species which have a set of cal-careous plates, disposed around the wall of the pharynx, we do not findamong them any representation, that is apparent to the unassistedeye. of thai skeleton which constitutes so distinctive a feature of the 1 Set- Ills iiifiuoir in ilic L/Kitrtin Triinxiii-tiniix, xxv. p. oG5 ; see :ilso Bell,. Eoy. Microsc. Soc. lss-2. ].. -l-ll. HOLOTHUEIAN SPICULES 895 class But a microscopic examination of their integumentat once brings to view the existence of great numbers of minuteisolated plates, every one of them presenting the characteristic re-ticulated structure, which are set with greater or less closeness in.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmicrosc, bookyear1901
