. The Cambridge natural history. Zoology. SHOULDER BLADE AND LOCOMOTION 17. the spine, the prescapular lamina, is most extensively developed in such animals as per- form complex move- ments with the fore- limbs. The Sea Lion and the Great Anteater are cited by I'rofessor (t, B. Howes as ex- amples of this pre- ponderance of the an- terior portion of the scapula over that which lies l)ehind the spine. The creneral shape of ^^«-27--Right scapula of Dolphin (r^^moi^s <,m^^^^^ " i X J. a, Acromion ; «/, prescapular lossa ; c, cora- the scapula varies con- coid ; gc, glenoid cavity ; pf,
. The Cambridge natural history. Zoology. SHOULDER BLADE AND LOCOMOTION 17. the spine, the prescapular lamina, is most extensively developed in such animals as per- form complex move- ments with the fore- limbs. The Sea Lion and the Great Anteater are cited by I'rofessor (t, B. Howes as ex- amples of this pre- ponderance of the an- terior portion of the scapula over that which lies l)ehind the spine. The creneral shape of ^^«-27--Right scapula of Dolphin (r^^moi^s <,m^^^^^ " i X J. a, Acromion ; «/, prescapular lossa ; c, cora- the scapula varies con- coid ; gc, glenoid cavity ; pf, postscapular fossa. Siderably among the (From Flower's ;«o%y.) different orders of mammals ; but it always presents the characters mentioned, which are nowhere seen among the Sauropsida except among certain Anomodonts, which will be duly referred to (see p. 90). The most conspicuous divergences from the normal are to be found in the Cetacea and the Monotremata. In the former the acromion is approxi- mated so nearly to the anterior l)order of the l)lade-bone that the prescapular fossa is reduced to a very small area ; and in Platanista the acromion actually coincides , _ , with the anterior border, so that Fig. 28.âSide view of right half of n t t shoulder girdle of a young Echidna that fossa actually disappears. In {Echidna hystrix). x | a, Aero- ^^^^ Whales, too, the scapula is as mion : c, coracoid ; co, coracoid ⢠ii i border; d, clavicle; ess, coraco- a rule Very broad, especially above : scapular suture; ec, epicoracoid ; -^ ^^^^ frequently a fan-like contour. ffb, glenoid border ; gc, glenoid i cavity; ic, interclavicle; j^f, post- In the Monotremata the acromion scapular fossa; i«, presternum; ., ^ coincides with the anterior spme ; ss, Viprascapular epiphysis ; "â ^'^^ v.^±xxk. ssf, subscapular fossa. (From border of the scapula; but the Flower's Osteoiogr,.) sameness of appearance which it thus presents (in this feature) to the Cetacean scap
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Keywords: ., bookauthorsh, bookcentury1800, bookdecade1890, booksubjectzoology
