Archive image from page 18 of The Danish Ingolf-Expedition (1903). The Danish Ingolf-Expedition danishingolfexpe0401ingo Year: 1903 ECHINOIDEA. I. i i Tripneustes they are dump-bell-shaped, and in many genera they are irregular, perforated calcareous plates. Perrier (op. cit.) and especially Stewart') have figured the spicules of many Echinoids; but they have not, any more than the pedicellarise, hitherto been of any importance in the classification. The sphaeridia do not appear to show such differences in structure that they may yield system- atic characters. On the other hand the structure

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Archive image from page 18 of The Danish Ingolf-Expedition (1903). The Danish Ingolf-Expedition danishingolfexpe0401ingo Year: 1903 ECHINOIDEA. I. i i Tripneustes they are dump-bell-shaped, and in many genera they are irregular, perforated calcareous plates. Perrier (op. cit.) and especially Stewart') have figured the spicules of many Echinoids; but they have not, any more than the pedicellarise, hitherto been of any importance in the classification. The sphaeridia do not appear to show such differences in structure that they may yield system- atic characters. On the other hand the structure of the spines is of no small systematic importance, as especially shown by Mackintosh (264—265), and they are never to be passed by in the descrip- - $& V-

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