. Journal of experimental zoology. s tubico-lous worms Dalyell,^ remarked concerning Amphitrite bombyxthat it is impatient of light, withdrawing into its tube in-stantly upon the interception of the light. ^The Powers of the Creator Reyealed. London, 1853. Quoted horn Andrews Jour Morph.,vol. V, p. 287. The Journal of Experimental Zoology, Vol. hi, No. 2. 296 Chas. W. Haraitt Claparede,^ has also called attention to a similar feature inBranchiomma koUikeri, stating that it is very sensitive tochanges in the amount of illumination, for a slight movement ofthe hand at a distance of a meter from
. Journal of experimental zoology. s tubico-lous worms Dalyell,^ remarked concerning Amphitrite bombyxthat it is impatient of light, withdrawing into its tube in-stantly upon the interception of the light. ^The Powers of the Creator Reyealed. London, 1853. Quoted horn Andrews Jour Morph.,vol. V, p. 287. The Journal of Experimental Zoology, Vol. hi, No. 2. 296 Chas. W. Haraitt Claparede,^ has also called attention to a similar feature inBranchiomma koUikeri, stating that it is very sensitive tochanges in the amount of illumination, for a slight movement ofthe hand at a distance of a meter from the aquarium, causes allthe animals to withdraw into their tubes as soon as the shadowfalls upon them. Yet Sabellas, having no eyes, remained im-mobile and unaffected. It will be seen from some of the following observations that thereference to Sabella is more or less incorrect, since our species ofSabella, at least, are quite well provided with eyes, and are alsosubject to the same stimuli as are others, differing only in Fig. I. Several individual tubes of Hydroides dianthus, showing general aspects whengrowing freely upon shells or similar substratum. (Somewhat less than natural size.) Similar observations have been made also by Darwin^ andothers upon earthworms, the significance of which is probablyof the same general character as the former. Still later ob-servations upon species of Tubicolidae have been made by Andrews,Loeb, Nagel, and others, which will be considered in detail in alater connection. ^AnnelidesChetopodesduGolfesde Naples. 1868. Quoted fromAndrews JourMorph., vol. v,p. 287.^The Formation of Vegetable Mould through the Actions of Worms. 1881. Behavior of Tubicolous Annelids 297 My observations extended to the following named species:Hydroides dianthus, Potamilla oculifera, and Sabella microph-thalmia, chiefly the first. These were available in considerablenumbers, and collected from various shells about the docks of theUnited States Fish Commission,
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