. Elements of comparative zoology. Zoology. LANCELETS. 289 the child does not resemble the parents, but the grand- parents, another example of alternation of generations. The Tunicates are all marine, and they abound in the seas of all parts of the world. Some of them are known from their shapes and color as 'sea-peaches/ others as 'sea- pears/ while a common name for all is ' sea- squirts/ due to the fact that they squirt water from the openings upon being Fig. 99.—A simple Tunicate (Molgula manhattensis). Branch II.—LEPTOCARDII (Lancelets). The few species of lancelets (Amphioxus
. Elements of comparative zoology. Zoology. LANCELETS. 289 the child does not resemble the parents, but the grand- parents, another example of alternation of generations. The Tunicates are all marine, and they abound in the seas of all parts of the world. Some of them are known from their shapes and color as 'sea-peaches/ others as 'sea- pears/ while a common name for all is ' sea- squirts/ due to the fact that they squirt water from the openings upon being Fig. 99.—A simple Tunicate (Molgula manhattensis). Branch II.—LEPTOCARDII (Lancelets). The few species of lancelets (Amphioxus) are all marine and occur in warmer seas. They have a body which is fish-like, but they differ from all fishes in the absence of a true heart and of a skull. The gill-slits are numerous. 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 Kingsley, J. S. (John Sterling), 1854-1929. New York, H. Holt and Company
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