. A text-book of invertebrate morphology. Invertebrates. 604 INVERTEBRATE MORPHOLOGY. The blood-spaces in the proboscis-gland communicate with the heart, and the dorsal and ventral vessels of the collar and trunk are united by a double set of fine lacunar capillaries, one set being situated in the body-wall, and the other in the. Fig. 375.—Transverse Sections through (A) the Proboscis and (B) the Branchial Region op the Trunk of Balanoglossus Kowalewskii (B after Spengel). cop = collar-coelom. g = tongue-bar of skeleton. h = heart. kd = branchial valve. kh — branchiiil portion of oesophagus. k
. A text-book of invertebrate morphology. Invertebrates. 604 INVERTEBRATE MORPHOLOGY. The blood-spaces in the proboscis-gland communicate with the heart, and the dorsal and ventral vessels of the collar and trunk are united by a double set of fine lacunar capillaries, one set being situated in the body-wall, and the other in the. Fig. 375.—Transverse Sections through (A) the Proboscis and (B) the Branchial Region op the Trunk of Balanoglossus Kowalewskii (B after Spengel). cop = collar-coelom. g = tongue-bar of skeleton. h = heart. kd = branchial valve. kh — branchiiil portion of oesophagus. ka = branchial septum. kp = branchial pore. Im = longitudinal muscles. no = notochord. nd = dorsal nerve. nv = ventral nerve. 0 = CBsophagus. pc = proboscis-coelom. pg = proboscis-gland. ps = proboscis-vesicle. wall of the intestine. The blood is a colorless coagulable fluid, apparently destitute of corpuscles. In the posterior portion of the proboscis is found a plate of chitinlike material produced into two horns posteriorly, and frequently' somewhat hollowed out in front. It is evi- dently supportive in function, and forms the proboscis-skele- ton. In connection with the branchial slits a similar chitinous skeleton is formed (Fig. 276) consisting of a series of trans- verse bars placed over each septum between adjacent slits. From the middle of each bar a rod (really double) passes down each septum (sb), and from the extremities a bar {tb) passes into each of the adjacent tonguelike valves, each valve thus possessing a bar from the arch lying in front of it and another from that lying behind it. The septal bars and the. 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 and Company
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