Lect. VII.] WORKING OUT OLD STRAINS. 185 



with many of the members of that much-extinguished 

 Order. Other types, not thus confused in their ambi- 

 tion, worked out the old strain of Metatherian degrada- 

 tion, and taking to one definite line of ascent, put on 

 new specialisations in harmony with their surroundings, 

 and to this day their descendants are the rulers of the 

 forest and the field. 



ADDENDUM TO LECTURE YII. 

 Bibliographical Eeferexces. 



Allmax, Prof. George J., F.R.S., "On the Characters and Affinities 



of Potamogale," Trans. Zool. Soc, vol. vi. phxtes i. ii., woodcnts 



%s 1-9, pp. 1-16.1 

 Alston, E. K., " On an Undescribed Shrew from Central America," 



Proc. Zool. Soc, 1877, pp. 445, 446. 

 Anderson, John, M.D., " On the Osteology and Dentition of Hylo- 



mys," Trans. Zool. Soc, vol. viii. art. 13, plate Ixiv. pp. 453- 



467 (1874). 

 Austen, JST. J., " On the Habits of the "Water Shrew {Crossopus 



fodiens), Proc Zool. Soc, 1865, pp. 519-521. 

 Barboza der BocAGE, Dr J. V., " Sur qnelques ]Mamniiferes pen 



connns, d'Afrique Occidentale, qui se trouvent an ]Mnseum de 



JAahowwe," Proc Zool. Soc, 1865, pp. 401-404. {Ba>jonia velo.v 



vel Potamorjalft velox.) 

 Brandt, J. F., " On Solenodon," Memoirs of the Imperial Aca'lemy 



of St Petershimj, 1832-3. 

 CouES, Elliot, " Precursory Notes on American Insectivorous 



Mammals with Description of ISTew Species," U. S. Survey. 



"On Scapanus Americanns," American Naturalist, I^o. 13, 



p. 189 (1879). 



^ In tliis paper, besides the excellent figures illustrating the anatomy of this, 

 the noblest of the Insectivorous types, there is a splendid coloured plate (i. ) from 

 one of Wolfs originals. Every such plate is an invaluable addition to zoology. 



