ORDERS. 51 



Examples. Ascaris, strongylus, lernsea, (gill- 

 worms.) 



2. PARENCHYMATA, destitute of internal cavi- 

 ties and of mouths ; having pores for imbibing nu- 

 triment. 



Examples. Fasciola (fluke) planaria, tsenia, 

 (tape-worm) scolex, ligula. 



XII. CLASS ACALEPHA 



IS DIVIDED INTO TWO ORDERS. 



t. AFFIXATA, fixed at their bases, at pleasure ? 

 though not often moving far. 



Examples. Actinia (sea-anemone,) lucernaria. 



2. LIBERATA, not fixed ; but swimming or float- 

 ing from place to place. 



Examples. Medusa (sea-nettle) berce, cestrum, 



XITT. CLASS POLYPI 



IS DIVIDED INTO TWO ORDERS. 



1. NUDATA, naked polypi. 



Examples. Hydra, (brachial polypus,) vorti- 

 cella (flower polypus.) 



2. POLTPETRA, stone-cased polypi. 

 Examples. Tubipora (tubipore coral,) seriu- 



laria (sea-moss,) flustra (sea-mat,) cellepora, (cel- 

 lepore coral,) corallina (coralline,) antipathos (sea- 

 fan,) isis (jointed coral,) madrepora (madrepore 

 coral,) millepora (many-pored coral,) retepora 

 (net-mesh coral,) pennatula (sea-pen,) alcyonium 

 (fungus coral,) spongia (sponge,) 



