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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated.1906 Excerpt: ... A STUDY OF THE LIFE-HISTORY AND HABITS OF CH.ETOPTERUS VARIOPEDATUS, REXIER ET CLAPAREDE. HOWARD EDWIN EXDERS. With Three Tlates. Introduction. While I was at Beaufort, Xorth Carolina, during the season of 1903, I became interested in the peculiar modifications that adapt Chaetopterus to its sedentary mode of life. At the suggestion of Dr. E. A. Andrews I undertook to study its embryology and anatomy the following season, but was unable to rear the lame beyond the stages which E. B. Wilson has described. Toward the end of the season of 1905 I was successful in rearing larvae from eggs to such a stage that it was possible to know the younger larvae collected in the towings. I was fortunate enough to find a sufficient number of Chaetopterus larvae in the towings to observe the important stages in the lifehistory and to rear the younger ones in the aquaria. In a brief time they grew to stages that correspond with the young worms on the sand flats. I have now two worms living in the laboratory of the Johns Hopkins University that grew from larva; taken in the townet more than ten months ago. The muscular movements of the older larvae were so strong and rapid that it was impossible to make projection drawings of them. Narcotization, was unsatisfactory, so they were drawn by the aid of measurements made with a micrometer eye-piece. I have sectioned some of the larvae, but the number of specimens is insufficient for a complete study. T hope to present the results of a histological study of Chaetopterus in a later paper. The Joiunal Of MnnrHni.or.Y.--Vol. XX. No.: !. The presence of hundreds of Spioclwetopterus larvae, which, in the younger stages, resemble the younger larvae of Chaatopterus, confused me for two weeks until I permitted several of each genus to settl..
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