Outlines of zoology . Fig. 63.—A. Young Dicyema.— After Whitman. B. Female Orthonectid {Khopalura giar- dii).—After Julin. c, Ectoderm; £•«., inner endoderm cell with nucleus(M.); and embryo (e?>i.). Note the segmentation and the fibrillation supposed to be muscular. Fig. 64.—Salinella.—After Frenzel. I. Longitudinal section—a., anterior;^., pos-terior. z. Transverse section. the body consists of a ciliated outer layer, enclosing a single multi-nucleate inner cell, within which egg-like germs develop, apparentlywithout fertilisation, into dimorphic embryos (see Fig. 63, A). 2. Orthonectidce
Outlines of zoology . Fig. 63.—A. Young Dicyema.— After Whitman. B. Female Orthonectid {Khopalura giar- dii).—After Julin. c, Ectoderm; £•«., inner endoderm cell with nucleus(M.); and embryo (e?>i.). Note the segmentation and the fibrillation supposed to be muscular. Fig. 64.—Salinella.—After Frenzel. I. Longitudinal section—a., anterior;^., pos-terior. z. Transverse section. the body consists of a ciliated outer layer, enclosing a single multi-nucleate inner cell, within which egg-like germs develop, apparentlywithout fertilisation, into dimorphic embryos (see Fig. 63, A). 2. Orthonectidce (type Rhopalura) occur as parasites in Turbellarians,Brittle-stars, and Nemerteans; the body is slightly ringed, and con-sists of a ciliated outer layer, a subjacent sheath of contractile fibres,and an internal mass of cells, among which ova and spermatozoaappear. The sexes are separate and dimorphic (see Fig. 63, B). 136 MESOZOA. 3. Professor F. E. Schulze discovered a small marine organism —Tricho
Size: 914px × 2735px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookidcu3192, booksubjectzoology
