. Zoology : for students and general readers . Zoology. 248 aooLo&r. miu the shell is inequilateral, one, usually the lower, being fixed to some object, and the intestine does not pass through the ventricle; in Area the ventricle is double. In Lucina and Corhis there is but one gill on each side, and in Peden, Spondylus and Trigonia the gills are reduced to comb-like. ^^y-^^if*'^^^ Fig. 168.—Mytilis edulis, common mussel, a, mantle ; b, foot; c, byssue ; d and e, muscles retracting the foot; f, mouth ; q, palpi; h^ visceral mass : i, inner gill; J, outer gill.—From Brehm's " Tbierlebe
. Zoology : for students and general readers . Zoology. 248 aooLo&r. miu the shell is inequilateral, one, usually the lower, being fixed to some object, and the intestine does not pass through the ventricle; in Area the ventricle is double. In Lucina and Corhis there is but one gill on each side, and in Peden, Spondylus and Trigonia the gills are reduced to comb-like. ^^y-^^if*'^^^ Fig. 168.—Mytilis edulis, common mussel, a, mantle ; b, foot; c, byssue ; d and e, muscles retracting the foot; f, mouth ; q, palpi; h^ visceral mass : i, inner gill; J, outer gill.—From Brehm's " ; processes. There are usually no eyes present; in the scallop (Pecten), however, there is a row of bright shining eyes with tentacles along the edge of the mantle, and contrary to the habits of most bivalves, the scallop can skip over the surface of the water by violently opening and shutting its shell. Trigonia is also capable of leaping a short distance ; while Lima (Fig-167) is an active flyer or leaper. Ostrea and Cyclas are dioecious, while many mollusks are monoecious or hermaphroditic. The foot varies much in form, in the mussel {Mytilus, Figs. 1G8, 109), Pinna, Cyclocardia {Car- (lita) (Fig. 170), and the pearl-oyster it is finger-shaped and. 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. New York : Henry Holt
Size: 1465px × 1705px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, booksubjectzoology, bookyear1879
