Elementary text-book of zoology (1884) Elementary text-book of zoology elementarytextbo0101clau Year: 1884 FIG. 233.—Developmental stages of Comntnla (Anfedon), much enlarged, a, free-swimming larva with tuft and rings of cilia (Wr), also with rudimentary calcareous plates. 6, At- tached Pentacrinoid form of the same animal. O, Oralia; S, Radialia; S, Basalia; Cd, Centrodorsal plate, c, Older stage described as Pentad-inns europaeus with arms and cirri (after Thomson). and pass on to the arms, and their branches and pinnules; they are lined by soft skin, and carry the tentacle-like ambulacral
Elementary text-book of zoology (1884) Elementary text-book of zoology elementarytextbo0101clau Year: 1884 FIG. 233.—Developmental stages of Comntnla (Anfedon), much enlarged, a, free-swimming larva with tuft and rings of cilia (Wr), also with rudimentary calcareous plates. 6, At- tached Pentacrinoid form of the same animal. O, Oralia; S, Radialia; S, Basalia; Cd, Centrodorsal plate, c, Older stage described as Pentad-inns europaeus with arms and cirri (after Thomson). and pass on to the arms, and their branches and pinnules; they are lined by soft skin, and carry the tentacle-like ambulacral appendages. The anus, when it is present, lies excentrically on the ambulacral (ventral) surface of the disc. The development of the living genus Comatula, which begins with a barrel-shaped larva with four bands of cilia and leads to the fixed stage of the Pen-
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