. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). 110 INVERTEBRATE MORPHOLOGY. the ari>.ugement of tho retractor muscles as shown in Figuro 67. 3. Order Ceriantheae. The Ceriauthoro are, like the , solitary forms destitute ci v. skeletou, uiul live imbedded iu saiu! or mud. Tho basal region is roundod and not adhesive, having at the centn? a pore which conimuniea 3s with tho eoeleuteron. Jji Ceriivnthun a tibrous investment surrounds the body ay a tabc, secreted by the ectoderm, this layer of the body bein
. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). 110 INVERTEBRATE MORPHOLOGY. the ari>.ugement of tho retractor muscles as shown in Figuro 67. 3. Order Ceriantheae. The Ceriauthoro are, like the , solitary forms destitute ci v. skeletou, uiul live imbedded iu saiu! or mud. Tho basal region is roundod and not adhesive, having at the centn? a pore which conimuniea 3s with tho eoeleuteron. Jji Ceriivnthun a tibrous investment surrounds the body ay a tabc, secreted by the ectoderm, this layer of the body being further characterized by an enormous development of muscle-tibres arranged longitudinaiij and supported upou slender processes of the mesoglwa of the body-wall. The tentacles are simple and very numerous, being arranged in two setS; one surround- ing th{» margin of the funnel- shaped disk and the other im- mediately surrounding the mouth. The mesenteries are also very numerous and are distinguished by the absence iu the adult of '-etractor muscles, the ectodermal muscles playing the part of the retractors, and the tdiaracteristic Antln)Z()iin sphincter is also absent. The arrangement of the meyanteries (Fig. 02) is peculiar to the group, new ones continuing to form during the entire life of the animal and making their appearance one on each side. VEU^K Skition ok a YotiNO Ceri- anthus (according to Caiu-ohkn). Hi = slphonofflyplic. I-IV = tlie Edwftrdsian inosciiteries. 1-4 = si'coiidiiry incscntcrios. of the sagittal plane between the two which immediately preceded them. The older mes- ontories are thus cowdod to one surface of the body, tlie surface, at which the single sii)honogiy})he {si) occurs in the sfomatodaMim, and the four on either side of flie mid-dorsal line (/-/F'> are the homologues of the ei^lit mosonteries of the Edwardsiir, tiie rest being secondary structures not represented in that Please note that these images are extracted from scann
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