A history of the British sea-anemones and corals . ates, is called theCALICE (calyx). Sometimes the exterior of the wall isfurnished with longitudinal PviBS (costce), which correspondto the plates. The plates are arranged in cycles : those of the firstcycle project furthest inwards; those of the second bisectthe interspaces; those of the third bisect the interspacesthus formed, and so on. The whole of the plates developedin one primary interspace constitutes a SYSTEM. In theTuRBiNOLiAD^E the corallum is solid (not porous),simple, with the lamellar interspaces reaching to thebottom of the cavit
A history of the British sea-anemones and corals . ates, is called theCALICE (calyx). Sometimes the exterior of the wall isfurnished with longitudinal PviBS (costce), which correspondto the plates. The plates are arranged in cycles : those of the firstcycle project furthest inwards; those of the second bisectthe interspaces; those of the third bisect the interspacesthus formed, and so on. The whole of the plates developedin one primary interspace constitutes a SYSTEM. In theTuRBiNOLiAD^E the corallum is solid (not porous),simple, with the lamellar interspaces reaching to thebottom of the cavity, and perfectly free. The plates arehighly developed, simple, and generally have a granularsurface. The ribs are well-marked. x 2 308 ANALYSIS OF BRITISH GENERA. With palules : adherent. Pahdes in a single circle : columella of many slender twisted plates Caryophyllia. Palules in several circles : columella broad and irre-gular in form Paracyathus. Without palules : free. Columella a single plate SphenotrocTms, Columella absent Ulocyathus. 3 I . LOPHELIA PROLIFERA .2. PEACH IA TRIPHY3 . SPHENOTROCHUS WRICHTll 5. ZOANTHUS COUCHII . 6. PARACYATHUS TAXIUANUS. 7 P PTLROPUS. •cues, sc ; 7 9. PHYLLANCIA BALANOPHYLLIA RE( 4- S MAT AMHRTWAMi rum ,- Q ! c ;;!» GENUS I. CARY0PHYLL1A (Lamarck). Cyathina (Ehrenb.). Corallum simple, generally obconic, often with anexpanded base, permanently adherent; outline ovateor circular. Columella composed of several thin, narrow, twisted,vertical plates. Pahdes broad, entire, in a single circle. Plates straight, broad, projecting, and forming sixsystems. Bibs straight, developed only towards the summit,granulated. The animal (for so we may conventionally term thesoft tissues, though it is to be remembered that thecorallum is an essential part of the living body) is, sofar as we know it, translucent, the column very exten-sile, the disk protrusile, the tentacles set in severalrows, diminishing in size from the outer row inward,eac
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