. A manual of zoology. 292 MANUAL OF ZOOLOGY In the limpets {Patella and its allies1) (Fig. 179) the true ctenidia are represented only by a pair of vestiges, and respiration is carried on by a number of secondary branchiae (g. /) in the form of lamella; situated between the short lateral fold of the mantle and the foot. In the Pul- monata, and in some members of other groups, ctenidia are absent, and the mantle-cavity, completely enclosed except. Fig. 179.—Patella vulgata, seen from the ventral side, f, foot;^./, circlet of gill lamella;; m. e, edge of the mantle; mit, attachment muscle; si,
. A manual of zoology. 292 MANUAL OF ZOOLOGY In the limpets {Patella and its allies1) (Fig. 179) the true ctenidia are represented only by a pair of vestiges, and respiration is carried on by a number of secondary branchiae (g. /) in the form of lamella; situated between the short lateral fold of the mantle and the foot. In the Pul- monata, and in some members of other groups, ctenidia are absent, and the mantle-cavity, completely enclosed except. Fig. 179.—Patella vulgata, seen from the ventral side, f, foot;^./, circlet of gill lamella;; m. e, edge of the mantle; mit, attachment muscle; si, slits in the attachment muscle; sh, shell; t', efferent branchial vessel; v', aorta; ve, smaller vessels. (From the Cambridge Natural History.) for a small rounded opening, has the function of a pul- monary sac or lung (Fig. 180), its roof being richly sup- plied with blood-vessels; in the aquatic forms its function is apparently as much hydrostatic as respiratory. In some of the Pulmonata there is a return to a completely aquatic mode of respiration accompanied by the development of 1 Our common eastern American limpet is Acmcsa 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 Parker, T. Jeffery (Thomas Jeffery), 1850-1897; Haswell, William A. (William Aitcheson), 1854-1925. New York, The Macmillan Company; London, Macmillan & Co. ,Ltd.
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