Elementary text-book of zoology, general part and special part: protozoa to insecta . elementarytextbo00clau Year: 1892 282 ECHINODEEMATA. Tlie Fluteus larvte of the Ophiurids possess long lateral arms on the anterior dorso- ventral arch of the' band, on the dorso- lateral edge, and on the edge of the pos- terior ventral hood. The Pluteus larva of the Sea-urchin has no lateral arms, but pro- cesses are developed on the edge of the anterior ventral hood (fig. 226). The larvre of the Sjyatanfjidce are characterised by an unpaired apical rod, and those of Echinus and Echinocidaris by the pres
Elementary text-book of zoology, general part and special part: protozoa to insecta . elementarytextbo00clau Year: 1892 282 ECHINODEEMATA. Tlie Fluteus larvte of the Ophiurids possess long lateral arms on the anterior dorso- ventral arch of the' band, on the dorso- lateral edge, and on the edge of the pos- terior ventral hood. The Pluteus larva of the Sea-urchin has no lateral arms, but pro- cesses are developed on the edge of the anterior ventral hood (fig. 226). The larvre of the Sjyatanfjidce are characterised by an unpaired apical rod, and those of Echinus and Echinocidaris by the presence of ciliated epaulettes (fig. 227). The transformation of the laterally symmetrical larva with its bilateral processes and com- plicated organization into the body of the adult Echino- derm is not in all cases effected in the same mnnner. In the Sea-uichins and Star- fishes the young animal is developed by a process of new formation within the body of the larva, the stomach, intestine,and dcreiil sac alone persisting; while the transformation of the Auricularia into Synapta takes place without the lc33 of so many parts of the , the young passing through a pupadike intermediate stage. Fig 22r-P/«f.«.iarva of rcHn«WuW«. with fo-ir i- r ° ciliated epaulettes (TTe) (after E. Metschmkoft> In the first case a mass of from the ventral side. O, Muuth ; 4, anus. -Tlutcus of a Spaiangiig with •o-?allcd apical rod (StJ (after J. Muller).
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