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History of British animals - University of Guam Marine Laboratory

History of British animals - University of Guam Marine Laboratory

History of British animals - University of Guam Marine Laboratory

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474 RADIATA; ECHINODERMATA,ECHINIDJi.The coveringconsists <strong>of</strong> numerous angular plates, adhering byand pierced by numerous pores.simple or serrated sutures,These pores give passage to the canal <strong>of</strong> the tentacular processeswhieh are connected with the investing integument.The platesare also covered with tubercular processes, supportingmoveable spines.The body, when at rest, is supportedon the oral disc.I. Anocysti.— Vent in the dorsal surface.a. Vent central, in the axis <strong>of</strong> the body.Cidaris.Echinus.Clypeus.a. a. Vent lateral above the margin.\(Cassidula.Nucleolitis. /II.Pleurocysti.— Vent marginal.Echinarachnius.Spatangus.III.Catocysti.— Vent in the under surface.a. Mouth central.b. Avenues <strong>of</strong> pores limited.Echinocyamus.\(Echinanthus.Echinodiscus./b. b. Avenues <strong>of</strong> pores complete.Conulus.(Echinoneus)a. a. Mouth not central.Echinocorys.

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