Prof. A. Macalister on the Myology ofBradypus tridactylus. 51 



EXPLANATION OF PLATE IIL figs. 4-13. 



Fig. 4. Anterior part of Tcenia villosa, with the head (x 35). 



Fig. 5. Circlet of hooks of the same (X 240). 



Fig. 6. Single hooks of the same (x 'J20). 



Fig. 7. Joints of the same (x 3o). 



Fig. 8. Joints oi^'Tcenia infundibulifonms,^' from Otis tarda, in Rudolphi's 



collection (x 35), 

 Fig. 9. Idiogenes Otidis in a yonng stage ( X 9). 

 Fig. 10. The same, more advanced in development ( x 9). 

 Fig. 11. The anterior region of the same (x 18). 

 Fig. 12. Joints of the same, with generative organs ( x 35). 

 Fig. 13. Ova of the same (x 240). 



VII. — On the Myology o/Bradypus tridactylus ; with Remarlcs 

 on the general Muscular Anatomy of the Edentata. By 

 Alexandee Macalister, Demonstrator of Anatomy, Eoyal 

 College of Sm-geons, Ireland, Professor of Anatomy, Royal 

 Dublin Society*. 



The muscular anatomy of the Edentata is of particular interest 

 when considered in connexion with the curious habits of many 

 of the order, as well as when we consider it in connexion with 

 the zoological affinities of the group ; and attention has been 

 directed of late to the subject by a number of papers by various 

 anatomists. Through the kindness of Prof. Haughton, I have 

 been enabled to make a very careful dissection of (1) a very 

 fine young specimen of Ai [Bradyjnis tridactylus) and (2) four 

 Armadilloes {Dasypus sexcinctus) | and on these, with refe- 

 rences to the notes of a former dissection of a Seven-banded 

 Armadillo, I have founded the following remarks. The ana- 

 tomy of the Ai has been made the subject of description by 

 Slisemuhlf, Meckel J, and Cuvier§, that of the Anteaters by 

 Meckel II, Pouch et^, Owen**, and Rapptf; of Orycteropus by 

 Cuvier, Humphry J J, andGalton §§; of Armadilloes by Cuvier, 

 Meckel, and Galton. It may thus be seen how much has 

 been hitherto done as regards the study of the myology of 

 these animals. Most of these descriptions seem to be made 



* Communicated by the Author, having been read before the Royal 

 Zoological Society of Ireland. 



t l)e Musculis in extremitatibus Bradypodis tridactyli. Berol. 1815. 



X System der Vergleichenden Anatomie, 1828. 



§ Le9ons dAnat. Comparee, 1835. 



II Anat. des zweizehigen Ameisenfresser. Archiv, v. 1819. 



^ Memoire sur le gi-and Fourniilier. Premier livi-aison. 1867. 



** On the Anatomy of the Great Anteater (Trans. Zool. Soc. 1854), 



ft Anatomische Untersuchuugen liber die Edentaten. Tiibingen, 1852. 



XX Journal of Anat. & Phys. ser. 2. vol. i. p. 290. 



§§ Trans. Linn. Soc. vol, xxvi. p. 567. 



4-* 



