. The Cambridge natural history. Zoology. ...a. Fio 22.—Shoulder girdle of Ornithorhynchus. c\ c'-, c^, First, second, third ribs ; d, ' clavicle ; , epicoracoid ; es' and es", interclavicle (episternum); »)..<•, metacoracoid ; , manubrium sterni ; sc, scapula ; st, sternebra. (From Wiedersheim's Structure of Man.) and are attached to the clavicles, and are no doubt to be regarded as the same structure. Prolmbly in many mammals the manubrium will be found to be partly made up of corresponding rudiments. In any case, vestiges of au episternum in the shape of two minute ossicles h
. The Cambridge natural history. Zoology. ...a. Fio 22.—Shoulder girdle of Ornithorhynchus. c\ c'-, c^, First, second, third ribs ; d, ' clavicle ; , epicoracoid ; es' and es", interclavicle (episternum); »)..<•, metacoracoid ; , manubrium sterni ; sc, scapula ; st, sternebra. (From Wiedersheim's Structure of Man.) and are attached to the clavicles, and are no doubt to be regarded as the same structure. Prolmbly in many mammals the manubrium will be found to be partly made up of corresponding rudiments. In any case, vestiges of au episternum in the shape of two minute ossicles have been discovered in Man, lying in front of the manubrium. They have been termed ossa suprasternalia. In llan and in the Mole the paired nature of the episternum is clearly apparent. It has been suggested that this structure in its entirety belongs to the clavicles, just as the sternum belongs to the ribs ; that it formed out of the approximated and fused ends of the clavicles. Dr. IMivart ^ figured a good many years since a pair of ossicles in Mycetes, lying in one case between the ends of the clavicles and the manubrium sterni, and in another example anterior to the ventral ends of the clavicles. fJegenbaur has figured a. Fig. 23.—Ei>isternum of an em- bryo Mole, (After A. Gdtte.) (.'?, Clavicle ; es', central jior- tion of the episternum ; es'\ lateral portion of the same ; , costal ribs ; st, sternum. (The figure "was constructed from two consecutive hori- zontal sections.) (From Wiedersheim's Structure of Mail.) Proe. Ziiol. Soc. , p. 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 Harmer, S. F. (Sidney Frederic), Sir, 1862- ed; Shipley, A. E. (Arthur Everett), Sir, 1861-1927. ed. [London, Macmillan and Co. , Limited; New York, The Macmillan Company
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
