A treatise on zoology . Fig. LIV. Longitudinal section ofwall of anal tube of Antedon,bifida, showing villi (v) ofrectal wall and their glandcells (g). In the connectivetissue layer are plates ofstereom (st), and outside isepithelium (c). (Diagram-matised from Hamann.)Greatly Fig. LV. Section of a nearly rii)e sac-culus of Antcdoii hifido. int,su])erficial layer of integument;/, fibrillar attachments of con-tained cells to integument; cut,cutis surrounding sacculus, andcontaining nuclei (vs); g, granu-lar masses of the contained cells ;the large nuclei of these cells areseen below
A treatise on zoology . Fig. LIV. Longitudinal section ofwall of anal tube of Antedon,bifida, showing villi (v) ofrectal wall and their glandcells (g). In the connectivetissue layer are plates ofstereom (st), and outside isepithelium (c). (Diagram-matised from Hamann.)Greatly Fig. LV. Section of a nearly rii)e sac-culus of Antcdoii hifido. int,su])erficial layer of integument;/, fibrillar attachments of con-tained cells to integument; cut,cutis surrounding sacculus, andcontaining nuclei (vs); g, granu-lar masses of the contained cells ;the large nuclei of these cells areseen below in the lining epi-thelium (ep) of the sacculus.(After Cuenot.) x 200 diam. sacculi occur chiefly at the edges of the food-grooves ; and theside-plates, when highly developed, are notched for their reception(as seen in Fig. IX. 2). They have also been observed in thewalls of the gut, in the mesenteries, and above the chamberedorgan. They are developed so soon as the larva begins to have been regarded as calcigenous glands (Wy ville Thomson),mucous glands (Bury), excretory organs (Ludwig), symbiotic algae, Zooxanthellae (Vogt & Jung), and accumulations of reservematerial (Walther, and especially Cuenot, 1891). Since the com-prehensive account by the last-named, lit
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishe, booksubjectzoology
