. An introduction to the study of zoology. Zoology. COiLENTERATA. I59 tive functions. In many the reproductive polyps are so much reduced that they appear to be only organs, and not individuals of a colony; they were named blastostyles (reproductive buds) or gonophores (carriers of the reproductive organs) before their morphological value as separate individuals was fully. Fij. 36—Blastostyles, b, of a colony of hydroid polyps; r, hydroirt polyps retracted, e, expanded; c, enteron or digestive cavity, seen in optical Bection. (Magnified.) recognised. The fully-formed medusa is to be re- garded
. An introduction to the study of zoology. Zoology. COiLENTERATA. I59 tive functions. In many the reproductive polyps are so much reduced that they appear to be only organs, and not individuals of a colony; they were named blastostyles (reproductive buds) or gonophores (carriers of the reproductive organs) before their morphological value as separate individuals was fully. Fij. 36—Blastostyles, b, of a colony of hydroid polyps; r, hydroirt polyps retracted, e, expanded; c, enteron or digestive cavity, seen in optical Bection. (Magnified.) recognised. The fully-formed medusa is to be re- garded as a highly differentiated form of polyp, which is often flattened out and largely modified with a view to the necessities of a free-swimming existence. It will be noticed that the medusa> compared with the. 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 Lindsay, B. London, S. Sonnenschein
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
