. The Intellectual observer. rom the dividedportions destined to live. The latter put forth filaments like actinophrys, andsome of them become encysted. Out of the cysts came four or five monads withone whip, which can swim or creep like amoeba;. These objects are not integralportions of the sponge, and similar bodies appear in the eggs of other animalswhen they are perishing.— Anat.; Archiv. des Sciences. Pouchet on the Fission oe Animalcules.—-M. Pouchet considers fissionmuch more rare than is generally affirmed. He denies that fissiparity existsamong the vorticellids. During twenty
. The Intellectual observer. rom the dividedportions destined to live. The latter put forth filaments like actinophrys, andsome of them become encysted. Out of the cysts came four or five monads withone whip, which can swim or creep like amoeba;. These objects are not integralportions of the sponge, and similar bodies appear in the eggs of other animalswhen they are perishing.— Anat.; Archiv. des Sciences. Pouchet on the Fission oe Animalcules.—-M. Pouchet considers fissionmuch more rare than is generally affirmed. He denies that fissiparity existsamong the vorticellids. During twenty years he has never seen it in any vorti-cellid. In some rare cases he has seen two of these creatures soldered more common monstrosity he finds to consists in two individuals at the end ofthe same stalk, and this he considers has been taken for the closing stage of fissi-parity. Small, free vorticellids, he states, will also give rise to such an appearance,by attaching themselves parasitically to larger .VAN MUSSEL, (Anodonta cygnea.) . I. Shell of Anodonta cyg:1 ma -i <Utto. a, MaM ? . . i Iitto, folded back, b, Foot, c, Labral palpi, inner f , Outer gi] i embryos, e, Inner gills, f, Outer gill, valves and serrated hooks, b. Closed vali. *c, 0\r muscles (s) and origin of b; ament (v oc, Rec . ugh ventricle eaxt ee, Auricles, c, Anus, f, Portion Fig. 5. Portion of ou ? ? ? pta or divisioi t n of eggs, ? Fig. 6. f fin of fish, with parasitic embryos. TIE INTELLECTUAL OBSERVER. SEPTEMBER, 1864. THE SWAN-MUSSEL AND ITS ANATOMY. BY THE EEV. W. HOUGHTON, , (With a Tinted, Plate.) What collector of shells is unacquainted with the form ofthe fresh-water mussel, as it lies half buried in the mud,with its back or umbonal region, easily recognized by itswhite pearly appearance, above the surface; or as the sameanimal lies flat on the bottom of the river or pond, with itslarge, broad, and semi-transparent foot protruded between thevalves of the shell
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