. Journal of experimental zoology. on 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 d
. Journal of experimental zoology. on 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, from shells, various bivalves,Venus, Pecten, etc, from rocks dredged from depths varying fromtwo or three fathoms to fifteen to twenty in Vineyard Sound andBuzzards Bay. The other species were obtained in part fromamong colonies of Cynthia collected from the docks, and in partamong colonies of Hydroides. Their numbers were smallerthan those of Hydroides and the observations correspondingly. Fig. 2. Colony of Hydroides dianthus growing in complex mass from flat rock base. Thevarious aspects of the mouth of the tubes mav be easily distinguished, showing vertical, lateraland downward relations referred to in the paper. (Somewhat less than natural size.) less extended. As will be observed in a later connection thelimitations of experiments on species of Potamilla and Sabellawere due in part to their comparative indifference to the varioustests applied. EXPERIMENTS ON HYDROIDES DIANTHUS The general character of these annelids is so well known that noparticular account is necessary. The photographs of several typi- 298 Chas. W. Hargitt cal conditions will show quite enough to make clear the habitat andmodes of growth. Colonies growing upon shells are seldom large,while those growing upon rocks are frequently quite large, oftenincluding from thirty to fifty, or even more, distinct specimens,eachinhabiting its own tube, but forming inextricable
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