. Outlines of zoology. Zoology. SKIN. 413 lateral line in fishes and tadpoles. Here, however, they are scattered over the surface of the body, though especially abundant on the buccal cirri. The epidermis lies upon a thin layer of clear cutis. PL- ax.].. Fig. 178.—Transverse section through pharyngeal region of Amphioxus.—After Ray Lankester. , Spinal cord ; nek., notochord, beneath which lie the two dorsal aortae; myotome; , atrio-coelomic funnel, opening into sub-chordal ccelom; C, caecum; G., a genital sac with ova ; 7«A, metapleural fold ; atr., atrial cavity ; Ph., pharynx,
. Outlines of zoology. Zoology. SKIN. 413 lateral line in fishes and tadpoles. Here, however, they are scattered over the surface of the body, though especially abundant on the buccal cirri. The epidermis lies upon a thin layer of clear cutis. PL- ax.].. Fig. 178.—Transverse section through pharyngeal region of Amphioxus.—After Ray Lankester. , Spinal cord ; nek., notochord, beneath which lie the two dorsal aortae; myotome; , atrio-coelomic funnel, opening into sub-chordal ccelom; C, caecum; G., a genital sac with ova ; 7«A, metapleural fold ; atr., atrial cavity ; Ph., pharynx, with dorsal and ventral grooves, and bars between gill-slits. Note in the primary bars and in the ventral groove the small ccelomic spaces. The ectoderm is dark throughout. Beneath this there is a layer of fine tubes, which unite in a longitudinal canal running along each metapleural fold. These metapleural canals are said by some to arise in development by a splitting of an originally solid mass (schizoccelic); but it seems more probable that they aie morphologically portions of the true ccelom—ventrolateral extensions of the " collar-ccelom " (enteroccelic).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Thomson, J. Arthur (John Arthur), 1861-1933. Edinburgh, Glasgow and London, H. Frowde and Hodder & Stoughton
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Keywords: ., bookauthorth, bookcentury1800, bookdecade1890, booksubjectzoology
