Archive image from page 58 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0401todd Year: 1847 POLYP1FERA. 37 Caryojjliyllia has not exceed, and consequently their masses are always separate, and not agglomerated like those of Madrepores, Astreae, £c., which grow indefinitely. The polypes of Meandrinae oc- cupy the bottom of the furrows, and are va- riously coloured in different individuals. When attentively examined, they are seen to form membranous expansions, which cover the lamellae of the ambu- lacra but rarely mount to the summit of the ridges, t
Archive image from page 58 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0401todd Year: 1847 POLYP1FERA. 37 Caryojjliyllia has not exceed, and consequently their masses are always separate, and not agglomerated like those of Madrepores, Astreae, £c., which grow indefinitely. The polypes of Meandrinae oc- cupy the bottom of the furrows, and are va- riously coloured in different individuals. When attentively examined, they are seen to form membranous expansions, which cover the lamellae of the ambu- lacra but rarely mount to the summit of the ridges, the white- ness of which indicates the line of separation between the different rows of polypes. They are, in fact, Caryophylliae or Fungiae much elongated. They secrete, from all parts of their body, a mucosity so abundant that, on reversing the mass, it runs off like albumen. The same is the case with Agaricae and Pavoniae. When exposed to the sun the living part becomes black by pu- trefaction. On splitting the globular stony polypary of a Meandrina, the mode of its growth is very beautifully demonstrated. Commencing at the centre of the mass, the deposition of calcareous matter is seen to have progressed regularly in all directions, luyer after layer, like the coats of an onion, every stratum having, of course, in turn been the outer surface of the polypary and marked with the same sinuosities or con- volutions as are exhibited by the existing ex- terior, affording a very striking illustration of the mode of growth common to all the litho- phytous zoophytes, and of the mathematical precision with which they build their wonder- ful edifices. We are progressively conducted through various intermediate species of laminated zoo- phytes from the broadly extended disc of Fungia and the diffuse surface of Meandrina to more concentrated forms of these lithogenic polypes. In Turbinolia (Jig. 41), for example, the superior laminiferous disc is evidently an approximation to the stru
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