. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). 602 INVERTEBRA TE MORPHOLOO Y. \P ones are in the youuger stages of development, a tonguelike valve later growing down from the dorsal border of the pore and giving it its U-shaped form. Water flows in at the mouth and passes out through the branchial slits, which thus pos- sess a respiratory function. A few of the anterior slits open. Fig. 374.—Balanoglossus Kowalewskii (after Minot from Spenobl). br = branchial slit. c = collar. pr = proboscis. externally into the atr
. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). 602 INVERTEBRA TE MORPHOLOO Y. \P ones are in the youuger stages of development, a tonguelike valve later growing down from the dorsal border of the pore and giving it its U-shaped form. Water flows in at the mouth and passes out through the branchial slits, which thus pos- sess a respiratory function. A few of the anterior slits open. Fig. 374.—Balanoglossus Kowalewskii (after Minot from Spenobl). br = branchial slit. c = collar. pr = proboscis. externally into the atrium, being covered over by the back- wardly-projecting atrial folds of the collar, but the majority are quite uncovered and are plainly visible from the exterior. The ectoderm contains numerous mucous glands and is ciliated throughout, no external cuticle or " house," such as occurs in the Pterobranchia, being developed. Below it rests upon a thin basement-membrane. The coelom is clearly marked out, and consists of three portions completely separated from one another and corre- sponding to the three body regions. The proboscis-ccelom (Fig. 275, A, pc) is, in its anterior portion, a simple unpaired cavity lined with delicate cells and traversed by circular and longitudinal (tm) muscle-fibres. Posteriorly it is prolonged into two horns between which lies a mass of tissue consisting. 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 McMurrich, J. Playfair (James Playfair), 1859-1939. New York : H. Holt
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1894
