. Zoology. Zoology. 86 ZOOLOGY. Order 1. Cirripedia.—The barnacles would, at a first glance, liardly be I'egardcd as Ci'ustacea at all, so much modified is the form, owing to their fixed, parasitic mode of life. Tlie barnacle is, as in the common sessile form (Fig. 100), a shell-like animal, the shell composed of sev- eral pieces, with a conical movable lid, having an opening through which several pairs of long, many-jointed, hairy ap- pendages are thrust, thus cre- ating a current which sets in towards the mouth. The com- mon barnacle {Balanus lalanoi- des) abounds on every rocky shore from e
. Zoology. Zoology. 86 ZOOLOGY. Order 1. Cirripedia.—The barnacles would, at a first glance, liardly be I'egardcd as Ci'ustacea at all, so much modified is the form, owing to their fixed, parasitic mode of life. Tlie barnacle is, as in the common sessile form (Fig. 100), a shell-like animal, the shell composed of sev- eral pieces, with a conical movable lid, having an opening through which several pairs of long, many-jointed, hairy ap- pendages are thrust, thus cre- ating a current which sets in towards the mouth. The com- mon barnacle {Balanus lalanoi- des) abounds on every rocky shore from extreme high-water mark to deep water, and the student can, by putting a group Balanus of tlicm in sea-watcF, observe the opening and shutting of the valves and tlie movements of the hairy appendages. The metamorphosis of the barnacle is remarkable. After leaving the egg, it swims about as a minute Nmiplius or. Fio. 100.—A barnacle porcatus. Natural 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 Packard, A. S. (Alpheus Spring), 1839-1905. N. Y. , Holt
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1897
