1909.] OF MONKEYS OF THE GEXUS PITHECIA. 943 



cartilage might obliterate tliis ridge and lead to the conditions 

 observable in the adult Pithecia inihecia. On the other hand, 

 no positive facts exist with reference to the growth of the larynx 

 in any Pithecia, and it may well be that the difierences which I 

 am describing are actually specific difierences after all. 



The body of the hyoid, I may remark, is quite as large and as 

 well ossified as in P. ■pitliecla. 



List of Liter attire referred to. 



(1) Beddard, F. E. — On Certain Points in the Anatomy of 

 Callithrix torquata. Kovit. Zool. viii. 1901, p. 362. 



(3) Beddard, F. E. — On Bracliytirus calvus. P. Z. S. 1887, 

 p. 119. 



(3) Bradley, D. C. — On the Abdominal Viscera of Cercocebus 



faliginosus and Lagotkrix humholdti. Proc. Roy. Soc. 

 Edinb. xxiv. 1903, p. 505. 

 (3«) Forbes, W. A. — On the External Characters and Anatomy 

 of the Red TJakari Monkey {^Brachyurus rihhicundus), with 

 remarks on the other Species of that Genus. P. Z. S. 

 1880, p. 627. 



(4) Flatau & Jacobsohk. — Handbuch der Anatomic und 



vergleichenden Anatomic des Centralnervensystems der 

 Siiugethiere, Vol. i. Berlin, 1908. 



(5) Flower, W. H. — On the Anatomy of Pithecia monachtis. 



P.Z. S. 1862, p. 326. 



(6) Flower, W. H. — On the Brain of Mijcetes senicnlus. P. Z. S. 



1864, p, 335. 



(7) Flower, W. H. — Digestive Organs of Mammals. Med. 



Times & Gazette, 1872. 



(8) Huxley, T. H. — On the Brain of Ateles jxmniscus. P. Z. S. 



1861, p. 247. 



(9) KtKENTHAL it ZiEHEX. — Untersuchungen iibei' die gross- 



hirnfurchen der Primaten. Jen. Zeitschr. xxix. 1895, 

 p. 1. 



(10) RuGE. — Die ausferen Formverhaltnisse der Leber bei den 



Primaten. Moi-ph. Jahrb. xxx. p. 42. 



(11) Smith, G. Elliot. — On the Morphology of the Brain in 



the Mammalia, ikc. Trans. Linn. Soc. (2) viii. 1903, 

 p. 319. 



(12) Smith, G. Elliot. — Descriptive and Illustrated Catalogue 



of the Physiological Series of Comparative Anatomy, 

 Roy. Coll. Surgeons. Vol. ii. 2nd ed., 1902. 



(13) Turner, W. — The Convolutions of the Brain. J. Anat. 



Phys. XXV. 1891, p. 236. 



(14) Weldon, W. F. R.— Notes on Callithrix gigot. P. Z. S. 



1884, p. 6. 



