WORMS. 123 



61- Vermiculum, Inhabitant allied to a Terebella : 

 shell variously shaped, not attached to other bodies. 



65. S Eft pur, A. Inhabitant a Terebella : shell tubular, 

 affixed to other bodies, generally separated internally 

 by divisions at irregular distances.. 



66. Teredo. Inhabitant allied to a Terebella : shell cy- 

 lindrical, taper, flexuous, lodged in wood, with 2 tes- 

 taceous hemispherical valves covering the head of 

 the animal and truncate anteriorly, and 2 lanceolate- 

 ones near the tail. 



67. Sabella. Inhabitant various: shell tubular, com- 

 posed of particles of sand, broken shells,, and other 

 substances, united by a glutinous cement. 



ORDER IV. ZOOPHYTA. 



Composite animals, efflorescing like vegetables. 

 A. With a hard calcarious stem, Lithophytes. 

 $$. Madrepora. Animal resembling a Medusa:, coral 

 with lamellar star-like cavities. 



69. Mielepora. Animal a Hydra or Polype: coral 

 mostly branched, and covered with cylindrical turbi- 

 nate poresi 



70. Cellepora. Animal a Hydra or Polype : coital 

 somewhat membranaceous, composed of round cells. 



71. Isis. Animal growing in the form of a plant: 

 stem stony, jointed;; the joints striate longitudinally, 

 united by spongy or horny junctures, and covered with 

 a soft porous cellular flesh or. bark : mouths beset 

 with oviparous polypes. 



B. With a softer stem. Zoophytes. 



72. Gorgonia. Animal growing in the form of a plant : 

 stem coriaceous, corky, woody, horny or bony, com- 

 posed of glassy fibres; or stony, striate, taper, dilated 

 at the base, covered with a vascular or cellular flesh 

 or bark, and becoming spongy and friable when dry : 

 mouths ov florets covering the surface of the stem and 

 polype -bearing. 



73. Alcyonium. Animal generally growing in the form 

 of a plant: stem fixed, fleshy, gelatinous, spongy ; or. 

 coriaceous, covered with polype-bearing stellate 

 cells. 



74. Spongia. Animal fixed, flexile, torpid, of various 

 forms, composed either of reticulate fibres or masses 

 of small spines interwoven together, and clothed with 

 a gelatinous flesh full of small mouths on its surface, 

 by which it absorbs and rejects water. 



75. Flustra. Animal a Polype proceeding from porous 

 cells : stem fixed, foliaceous, membranaceous, consist- 



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