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Show 1888.] MORPHOLOGY OF SUPERNUMERARY PHALANGES. 511 14. LEYDIG, F.-Ueber den Bau der Zehnen bei Batrachiern und die Bedeutung des Fersenhockers. Morph. Jahrb. Bd. ii. pp. 165-196 (1876). 15. P A R K E R , T. J.-Second preliminary note on the Development of Apteryx. P. R. S. vol. xliii. pp. 482-487 (1888). 16. PETERS, W . C. H.-Reise nach Mossambique. Zool. iii. Amphib. (1882). 17. R Y D E R , J. A.-On the Genesis of the extra-terminal phalanges in the Cetacea. Amer. Nat. 1885, pp. 1013-1015. 18. STRASSER, H.-Zur Entwicklung der Extremitatenknorpel bei Salamandra und Tritonen. Morph. Jahrb. Bd. v. pp. 240-312 (1879). 19. W E B E R , MAX.-Anatomisches fiber Cetaceen. Ibid. Bd. xiii. pp. 616-653(1888). VIII. EXPLANATION OE THE PLATES. The figures are mostly drawn from tracings of photographs made for us by Mr. R. Chapman, and to him our thanks are due for the care bestowed upon their production. All the figures represent digits of the hind foot. Unless otherwise stated, they repuesent median longitudinal sections, as seen under a low power. PLATE XXIV. Fig. 1. Hyla arborea, late tadpole. 2. Rhacophorus eques, adult. 3. Hyla freycineti, adult. 4. Hyla ccerulea, not fully grown. 5. Nototrema marswpiatum, adult; penultimate joint, to show its ligament and annulus apparatus. 6. The same ; lateral section. 7. The same animal; to show distal joint, 8. Xenophrys monticola, adult. PLATE XXV. Pig. 9. Hyla arborea, tadpole ; to show the primary differentiation of the parts of the digital skeleton. Zeiss D, Oc. 2. 10. Rana temporaria, larva ; to show syndesmosis of terminal joint. Zeiss D, Oc. 2. 11. Bombinator bombinus, adult. 12. Proteus anguinus, syndesmosis of terminal phalanx. Zeiss D, Oc. 2. 13. Hyla peronii, adult. 14. Portion of the supernumerary phalanx in the same, more highly magnified. Zeiss F, Oc. 3. 15. Spelerpes fuscus, adult. 16. Rana temporaria, adult. Reference Letters. an. Annulus. cp. Cartilage corpuscle. I. Inter-articular ligament, le. Lacuna, ne. Nucleus, p.p. Penultimate phalanx, p.s. Supernumerary phalanx. p.t. Terminal phalanx, sh. Fibrous tunic of digital skeleton, sy'. Syndesmosis of terminal joint, sy". Syndesmosis of penultimate joint. tt Extensor tendon. 35* |
