. A manual of elementary zoology . Zoology. Fig. hi.—A medusa of Obelia, magnified. layer of jelly, which is very thick, especially on the exum- brella side. The medusa may be compared to a polyp which is greatly widened and shortened, the walls of the wide, flat enteron coming together in places, as we have. FlG. 112.—A diagram to illustrate the relation between polyp and medusa. A, The polyp ; B, an imaginary intermediate form ; C, the medusa. , Circular canal; , radial canal; ect., ectoderm; end., endoderm ; ent., enteron ; ,mouth ; mb., manubrium ; , oral cone; ten., ten
. A manual of elementary zoology . Zoology. Fig. hi.—A medusa of Obelia, magnified. layer of jelly, which is very thick, especially on the exum- brella side. The medusa may be compared to a polyp which is greatly widened and shortened, the walls of the wide, flat enteron coming together in places, as we have. FlG. 112.—A diagram to illustrate the relation between polyp and medusa. A, The polyp ; B, an imaginary intermediate form ; C, the medusa. , Circular canal; , radial canal; ect., ectoderm; end., endoderm ; ent., enteron ; ,mouth ; mb., manubrium ; , oral cone; ten., tentacle; vm., velum. The dotted line represents the velum as it is found in many medusae but not in seen, and the structureless lamella increasing in thickness to form the jelly. The manubrium represents the oral cone and the tentacles stand around it at a greater distance owing to the widening of the body. The arrangement of. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Borradaile, L. A. (Lancelot Alexander), 1872-1945. London : H. Frowde, Hodder & Stoughton
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectzoology, bookyear1920
