Outlines of zoology . ledge of it will removethese sets of animals from their apparentlyanomalous position. Class Phoronoidea. This class was erected for the genusPhoronis, which has been associated bothwith the Gephyrea and with Polyzoa.Another genus, Phoronopsis, from theCape, has been recently established. Ithas been proposed to associate thesetwo genera, along with Cephalodiscusand Rhibdopleura, with the Hemi-chorda, on account of certain Chordateaffinities, said to be exhibited by thelarva. The genus Phoronis includes a fewspecies of small marine worms, socialin habit, and found enclosed

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Outlines of zoology . ledge of it will removethese sets of animals from their apparentlyanomalous position. Class Phoronoidea. This class was erected for the genusPhoronis, which has been associated bothwith the Gephyrea and with Polyzoa.Another genus, Phoronopsis, from theCape, has been recently established. Ithas been proposed to associate thesetwo genera, along with Cephalodiscusand Rhibdopleura, with the Hemi-chorda, on account of certain Chordateaffinities, said to be exhibited by thelarva. The genus Phoronis includes a fewspecies of small marine worms, socialin habit, and found enclosed Stock Photo
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Outlines of zoology . ledge of it will removethese sets of animals from their apparentlyanomalous position. Class Phoronoidea. This class was erected for the genusPhoronis, which has been associated bothwith the Gephyrea and with Polyzoa.Another genus, Phoronopsis, from theCape, has been recently established. Ithas been proposed to associate thesetwo genera, along with Cephalodiscusand Rhibdopleura, with the Hemi-chorda, on account of certain Chordateaffinities, said to be exhibited by thelarva. The genus Phoronis includes a fewspecies of small marine worms, socialin habit, and found enclosed
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Outlines of zoology . ledge of it will removethese sets of animals from their apparentlyanomalous position. Class Phoronoidea. This class was erected for the genusPhoronis, which has been associated bothwith the Gephyrea and with Polyzoa.Another genus, Phoronopsis, from theCape, has been recently established. Ithas been proposed to associate thesetwo genera, along with Cephalodiscusand Rhibdopleura, with the Hemi-chorda, on account of certain Chordateaffinities, said to be exhibited by thelarva. The genus Phoronis includes a fewspecies of small marine worms, socialin habit, and found enclosed in fixedleathery tubes often encrusted with foreignparticles. Each individual is furnishedwith a horseshoe-shaped crown of tent-acles, which are hollow and supportedby an internal skeleton. The nervoussystem lies in the ectoderm — a veryprimitive character, and consists of aring round the mouth, and of a corddown the left side of the body. Aninteresting point is the presence of aclosed vascular system with nucleated. Fig. 127.—Actinotrocha orlarva of Phoronis.—AfterMasterman. The mouth is overhung by theprominent pre-oral hood; theanus is at the other end of thebody. Behind the mouth is aring of ciliated tentacles. SP.f the nerve ganglion in thehood; N.G., the nerve gan-glion of the region called collarregion by Masterman; CNR.,nerve-ring, at base of tentacles. POLYZOA. 249 red cells. The body cavity is well developed, and is divided intochambers. The sexes are united; and the larva, known as Acting