Elementary text-book of zoology, general Elementary text-book of zoology, general part and special part: protozoa to insecta elementarytextbo00clau Year: 1892 LOTENS LARVA. 363 Behind it is continued into an indifferent terminal portion equivalent to the whole body of the adult. At the apical region of the larva (fig. 294, S]}) there is a thickening of the ectoderm, which is called the apical plate. This represents the rudiment of the cerebral ganglion (apical ganglion), and gives off nerves to either side. The wide mouth (0) has a Fig. 291.—Development of Tnlygordius (after B. Hatscbck).
Elementary text-book of zoology, general Elementary text-book of zoology, general part and special part: protozoa to insecta elementarytextbo00clau Year: 1892 LOTENS LARVA. 363 Behind it is continued into an indifferent terminal portion equivalent to the whole body of the adult. At the apical region of the larva (fig. 294, S]}) there is a thickening of the ectoderm, which is called the apical plate. This represents the rudiment of the cerebral ganglion (apical ganglion), and gives off nerves to either side. The wide mouth (0) has a Fig. 291.—Development of Tnlygordius (after B. Hatscbck). a. Young larva ; Sji, apical plate with pigment spot; Frw, pree-nral circle of cilia; O, mouth; Pow, post-oral circle of cilia; A, anus; 21s, mesoderm ; KX. head kidney, b. Older larva with commencing segmentation of the body, a second limb is developed in the head kidney, c. Older stage. The body is elongated to the form of a woitq, and divided into a number of metameres ; SWk, posterior circle of cilia; Af, eye spot; F, tentacle. ventral position, and leads into an alimentary canal, which opens at the posterior end of the body [A). In front of the mouth there is a strongly developed circle (praDoral) of cilia [Prio); and behind
Size: 1372px × 1458px
Photo credit: © Bookworm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: archive, book, drawing, historical, history, illustration, image, page, picture, print, reference, vintage
