The laws and mechanics of circulation, with the principle involved in animal movement . ; C, thoracic duct. overestimate, being essential to life. Briefly, it consists as fol-lows : The body of the hyoid bone projects from its sides threepairs of long, curved, rib-like processes (Fig. 192, d), which areoperated by muscles connecting with the mandible and base ofthe skull, similar to what obtains in the frog, but much morepowerful, the whole inclosed by the muscular sheath {latissi- IJST CHELONIA- 423 mus colli (Fig. 172, 21, 25) expanded over it, connecting with themandible and ba
The laws and mechanics of circulation, with the principle involved in animal movement . ; C, thoracic duct. overestimate, being essential to life. Briefly, it consists as fol-lows : The body of the hyoid bone projects from its sides threepairs of long, curved, rib-like processes (Fig. 192, d), which areoperated by muscles connecting with the mandible and base ofthe skull, similar to what obtains in the frog, but much morepowerful, the whole inclosed by the muscular sheath {latissi- IJST CHELONIA- 423 mus colli (Fig. 172, 21, 25) expanded over it, connecting with themandible and base of the skull, imparting the rotund appear-ance and fullness upon the sides and inferior aspects, theunderlying hyoid-framework pushing out the soft in the frog, the pumping action is very rapid, and goes. Mg. 174.—Lung of a Tortoise (Emys Europcea). —Bojanus. The bristles indicate thefree passage of air through the lung structure, the chambers all freely communicat-ing with each other and the trachea (a), or bronchus. on all the while, in the water as well as out of it, which ledJohn Hunter to infer that it does not relate to respiration,which, in view of the extraordinary acuteness of perceptionwhich characterized that grand pioneer in natural history, is alittle remarkable, and explicable upon the ground simply thathe was not guided by this fundamental law underlying animalstructure and function, but seeking out the history in develop- 424 RESPIRATION IN CHELONIA ment itself; performing enormous labors with a singleness ofpurpose and devotion to make him memorable as long as rea-son lives and noble deeds are exemplars for men. The tor-toise, as well as the frog, when it goes beneath the water,must bottle up air in the lungs and air-pas?ages by means ofthe lingual valve applied to
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