THE DEVELOPMENT OF THE MARSUPIAL SHOULDER GIRDLE. 769 



(4) Parker, W. K., " A Monograph on the Structure and Development of the Shoulder Girdle and 

 Sternum," Ray Society, 1867. 



(5) Flower, W. H., Osteology of the Mammalia, 1st ed., Lond., 1870; 2nd ed., Lond., 1876. 



(6) Wilson, J. T., and M'Kay, W. J. S., "On the Homologies of the Borders and Surfaces of the 

 Scapula in Monotremes," Proc. Linn. Soc, N.S.W., 1893. 



(7) M'Kay, W. J. S., "The Morphology of the Muscles of the Shoulder Girdle in Monotremes," Proc. 

 Linn. Soc, N.S.W., 1894. 



(8) Owen, R., Article " Monotremata," Cyclopaedia of Anatomy and Physiology (Lond., 1847), vol. iii 



(9) Mivart, St George, " Anatomy of Echidna hystrix," Trans. Linn. Soc. Lond., vol. xxv., 1866. 



(10) Howes, G. B., "The Morphology of the Mammalian Coracoid," Journ. of Anat. and Phys., 

 vol. xxi., 1887. 



(11) Bruhl, C. B., "Zootomie aller Thierklassen " (Wien, 1875). 



(12) Seeley, H. G., "Researches on the Structure, etc., of Fossil Reptilia. viii. Further Evidences of 

 the Skeleton in Deuterosaurus and Rhopalodon from the Permian Rocks of Russia," Phil. Trans., 1894, 

 vol. 185, B. 



(13) Seeley, H. G., " Researches on the Structure, etc., of Fossil Reptilia, ix., sect. 5 ; On the 

 Skeleton in New Cynodontia from the Karroo Rocks," Phil. Trans., 1895, vol. 186, B. 



(14) Howes, G. B., "On the Coracoid of the Terrestrial Animals," Proc. Zool. Soc. Lond., 1893. 



(15) Lydekker, R., "Notes on the Coracoidal Element in Adult Sloths, with Remarks on its 

 iomology," Proc. Zool. Soc, 1893. 



(16) Gegenbaur, C, Grundriss der Vergleichenden Anatomie, Leipzig. 



(17) Wiedersheim, R., Grundriss der Vergleichenden Anatomie der Wirbelthiere, 4te Aufl., Jena, 

 898. 



(18) Gegenbaur, C, "Ein Fall von erblichem Mangel der Pars Acromialis Clavicular, mit Bemerkungen 

 her die Entwickelung der Clavicula," Jenaische Zeitschrift, 1864, Bd. i. 



(19) Gotte, A., "Beitrage zur vergl. Morphologie der Skeletsystems der Wirbelthiere; Brustbein und 

 chultergiirtel," Arch. f. Mikr. Anat., Bd. xiv., 1877. 



(20) Hoffmann, C. K., "Zur Morphologie des Schultergurtels und des Brustbeins bei Reptilien, 

 ogeln, Sangethieren und des Menschen," Niederland. Archiv. f. Zool, vol. v., 1879. 



(21) Andrews, C. W., "On the Development of the Shoulder Girdle of a Plesiosaur (Cryptoclidus 

 ccmiensis, Phillips, sp.)," Ann. and Mag. Nat. Hist., 1895. 



REFERENCES TO FIGURES. 



General — ac, acromion ; cl., clavicle ; cr., coracoid ; ep., ep 1 ., ep 2 ., epiphyses ; gl., glenoid cavity ; ost., 

 lo-sternum ; per., precoracoid ; r l .,r*., 1st and 2nd ribs ; sc, scapula ; sp., the rudimentary non-cartilaginous 

 ine = cleithrum ; st., sternum. 



Plate I. 



(Figures 1 to 13, except fig. 8, are reconstructions from series of sections.) 



Fig. 1. Outer view of shoulder girdle of 8 - 5 mm. Trichosurus embryo, x 34. The dotted portions are 

 i senchymatous. 



Fig. 2. Outer view of shoulder girdle of 10 mm. Trichosurus embryo, x 34. The dotted portions are 

 i senchymatous. 



Fig. 3. Outer view of shoulder girdle of 14 - 8 mm. Trichosurus embryo, x 27. The clavicle has been 

 i loved to show the omo-sternum. 



VOL. XXXIX. PART III. (NO. 29). 6 D 



