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Show 308 DR. H. GADOW ON THE SPECIES OF RHEA. [Mar. 17, 6. On the Anatomical Differences in the three Species of Rhea. By HANS GADOW, Ph.D., M.A. Cambridge. [Received March 17, 1885.] In the spring of 1883 the Museum of the University of Cambridge received from the Zoological Society of London two specimens of Rhea darwini and one of Rh. macrorhyncha, with the understanding that I should compare examples of the three species of Rhea hitherto known with each other, and point out their anatomical differences, provided there were any. The comparison made in the following pages must, however, necessarily be incomplete, because some of the specimens were imperfect and were of different ages and sexes. The material at m y disposal was the following :- One specimen of Rh. macrorhyncha, immature, with most of the viscera removed previously. One specimen of Rh. darwini, 3 , not quite adult; skeleton and viscera complete. One specimen of Rh. darwini, 2 i skeleton complete, viscera partly removed previously. Rh. americana. Several skeletons and preparations of visceral parts in the collections of the Universities of Cambridge and Heidelberg, and in the Museum of the Royal College of Surgeons of England. Literature. SCLATER, P. L. On the Rheas in the Society's Menagerie, " with Remarks on the known Species of Struthious Birds. P.Z.S. 1860, p. 207. . On the Struthious Birds living in the Society's Menagerie. Trans. Zool. Soc. iv. p. 353, pis. 68-70 (I860). B O O K I N G , A. Monographie des Nandu oder Sudamericanischen Strausses (Rhea americana). Arch. f. Naturgesch. 1863, p. 213. The same under the title of:-De Rhea Americana : Dissertatio Zoologica. Bonnae. C U N N I N G H A M , R. O. Notes on some Points in the Osteology ot Rhea americana and Rhea darwini. P. Z. S. 1871, p. 105, pis. vi. and vi. a. M I V A R T , ST. G E O R G E . On the Axial Skeleton of the Struthio-nidae. Trans. Zool. Soc. x. p. 1 (1877). M O S E N T H A L , J. D E , and H A R T I N G , J. E. Ostriches and Ostrich Farming. 8vo. London, 1877- SCLATER, P. L. Note on R. macrorhyncha. P. Z. S. 1877, p. 160. G A D O W , H. Versuch einer vergleichenden Anatomie des Ver-dauungs- Systemes der Vogel. Jenaische Zeitschrift, xiii. pp. 92, 339(1878). |