Quarterly journal of microscopical science . JUor. ^^ &-CX1 JOURNAL OF MICROSCOPICAL SCIENCE. EXPLANATION OF PLATE XXVII, Illustrating Dr, Horsts Paper on The Development ofthe European Oyster [Ostrea edulis, L.).^ Fig. 1.—Au egg in segmeutatiou, consisting of a large hypoblasticsphere and several epiblastic eells. Fig. 2.—Surface view of a later stage, witL two hypoblastic cells. Fig. 3.—Embryo viewed from the side, with begining invagination (gas-trula). Fig. 4.— Optical section through a more advanced stage, with the hypo-blastic invagination and the first
Quarterly journal of microscopical science . JUor. ^^ &-CX1 JOURNAL OF MICROSCOPICAL SCIENCE. EXPLANATION OF PLATE XXVII, Illustrating Dr, Horsts Paper on The Development ofthe European Oyster [Ostrea edulis, L.).^ Fig. 1.—Au egg in segmeutatiou, consisting of a large hypoblasticsphere and several epiblastic eells. Fig. 2.—Surface view of a later stage, witL two hypoblastic cells. Fig. 3.—Embryo viewed from the side, with begining invagination (gas-trula). Fig. 4.— Optical section through a more advanced stage, with the hypo-blastic invagination and the first apparition of the shell-gland—ec, epi-blast; eti, hypoblast; o, blastopore; sk, shell-gland. Fig. 5.—Au older embryo viewed from the side—v, foot. Fig. G.—Au optical section through the same stage—me, mesoblast ;d, arclienteron. Fig. 7.—Stage one (iay older, viewed from the front side, with blas-topore. Fig- 8.—Optical section through the same stage. Fig. 9.—Optical section through au embryo, one day older, with velum,ston^ch and shell, s. Pig. 10.—A later stage,
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Keywords: ., bookcentury1800, bookdecade1880, bookpublisherlondo, bookyear1882
