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THE AMERICAN NATURALIST [Vol. XLI 



and in A. scapha, according to M6negaux, there is not only a common 

 pericardium but the two ventricles are represented by one. Thus 

 in different species of Area there occurs all transitions from a single to a 

 double heart. 



After an extended consideration of the musculature of the gorilla 

 in comparison with that of man and the lower apes, Dr. A. Sommer 

 (Jena. Zeitschr. f. Naturwiss., Bd. 42, pp. 181-308, Taf. 25-28, 1906) 

 concludes, contrary to the opinion of Huxley, that the gorilla in this 

 part of its structure is more closely related to the lower apes than to 

 man. P. 



Two large frogs from South Kamerun, West Africa. — The Uni- 

 versity Museum, University of Michigan, has recently received, in a 

 very interesting collection made by Mr. George Schwab from the 

 vicinity of Efulen, Kribi, Kamerun, West Africa, a specimen each of 

 the Giant Frog, Rana goliath Boulenger, and the Hairy Frog, Tricho- 

 batrachus robustus Boulenger. Both of these specimens agree closely 

 with the descriptions recently published by Mr. Boulenger (T. robustus 

 Proc. Zool. Soc. Lond., May 8, 1900, 443; R. goliath, Ann. & Mag. 

 of Nat. Hist., XVn, 317-318, and Proc. Zool. Soc. Lond., I, 179). 



described l.y Mr. P...,ilcnuvr. Fn>in'sn..nt tc.'vont it measures Wm inin., 

 but Mr. Schwab, tlu- collector, states that 77 /.v onhj parthj gmwu. He 

 writes of its habits as follows: "This frog lives only in rivers, about 

 the rocky shores of deep pools. On the slightest provocation it dives 

 away, making it difficult to secure specimens." 



Alexander G. Ruthven. 



