. Bulletin. Natural history; Natuurlijke historie. LEGEND O——O Total no. of colonies settling on shells on dock. 0-——o Totol no. of colonies settling on shells on floot. O O No. of colonies which produced gemmules. p^ No. of colonies which settled since lost date l^vN of observation. Figure 28. Larval settling of Haliclona loosanoffi in two successive years. Milford Harbor. Left, 1947; right, 1948. ence in the two locations concerns the amount of sunlight which reached them. The float received the full light of the sun all day whereas the shell bags, sus- pended from the dock, were shaded. In
. Bulletin. Natural history; Natuurlijke historie. LEGEND O——O Total no. of colonies settling on shells on dock. 0-——o Totol no. of colonies settling on shells on floot. O O No. of colonies which produced gemmules. p^ No. of colonies which settled since lost date l^vN of observation. Figure 28. Larval settling of Haliclona loosanoffi in two successive years. Milford Harbor. Left, 1947; right, 1948. ence in the two locations concerns the amount of sunlight which reached them. The float received the full light of the sun all day whereas the shell bags, sus- pended from the dock, were shaded. In the other localities in Long Island Sound where this species has been taken, the colonies are invariably located on the undersides of overhanging granite blocks or on the lower sides of intertidal rocks and boulders. They have never been taken in exposed situations as is true of Halichondria bowerbanki. The numbers of colonies of the two species, Haliclona loosanoffi and Halichondria bowerbanki, which settled in exposed and shaded situations in the two successive years are shown in Table 34. TABLE 34 INFLUENCE OF LIGHT ON SETTLING OF SPONGE LARVAE SPECIES OF SPONGE LARVAE SETTLING IN FULL SUN 1947 LARVAE SETTLING IN SHADE 1947 LARVAE SETTLING IN SHADE 1948 Halichondria bowerbanki (Max. no. settling) 64 0 12 Haliclona loosanoffi (Max. no. settling) 29 82 43. 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 Peabody Museum of Natural History. New Haven : The Museum
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