English: Illustration from 1911 Encyclopædia Britannica, article BALANOGLOSSUS.
Fig. 3.—Structure of anterior end.
a, Arrow from proboscis-cavity (pc) passing to left of pericardium (per) and out through proboscis pore-canal. b1, arrow from central canal of neurochord (cnc) passed out through anterior neuropore. b2, ditto; through posterior neuropore. c, arrow intended to pass from 1st gill-pouch through collar pore-canal into collar-coelom (cc). cts, posterior limit of collar. dv, dorsal vessel passing into central sinus (bs). ev, efferent vessel passing into ventral vessel (vv). epr, epiphysial tubes. st, stomochord. vs, ventral septum of proboscis. sk, body of nuchal skeleton. m, mouth. th, throat. tb, tongue-bars. tc, trunk coelom.
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Encyclopædia Britannica, 1911
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== Summary == {{Information |Description={{en|1=Illustration from 1911 Encyclopædia Britannica, article BALANOGLOSSUS. Fig. 3.—Structure of anterior end. ''a'', Arrow from proboscis-cavity (''pc'') passing to left of pericardium (''per'') and out thr
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