SOME OBSERVATIONS ON ANTARCTIC CETACEA. 505 



but are capable of withstanding very great variations in temperature. There are 

 indications, for instance, that whales migrate from polar to tropical seas, ami that in 

 consequence northern ami southern species are probablv in many cases identical, as 

 has been urged by Sir WILLIAM TURNER and others.* 



* "Tin- l!if,'lit \Vlia1e of the North Atlantic, Balsma biscayensii, etc.," by Principal Sir WILLIAM TURNER, K.C.B., 

 F.R.S., D.C.L., Tunis. Hay. SHI-. Kilinlninjli, vol. xlviii. pt. iv., 1!H3. 



"The Baleen \Vlial-s of (\\<- Smith Atlantic," l>y Principal Sir WILLIAM TIKNER, K.C.B., F.R.S., D.C.L., 

 I'roc. Roy. Soc. Edinbitryh, vol. xxxv. part i. No. 2, 1914. 



EXPLANATION OF PLATES. 



Plate I. Facsimile drawings liy Mr W. (!. P.UUN Miuiimcn <>( a piebald porpoise (Lagenorhynchut 

 crucitjerl) taken at the Falkland Islands. 



Plate II. Photograph of Nordkapper (Bnliena liscayi-nsif), l>y Mr J. .1. BELL. 



