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 LECTUEE VII. 

 Bibliographical Eefbeences. 



Allman, Prof. Geoegb J., E.E.S., "On the Characters and Affinities 



of Potamogale,'' Trans. Zool. Soc, vol. vi. plates i. ii., woodcuts 



figs 1-9, pp. I-I6.1 

 Alston, E. N., " On an XJndescribed Shrew from Central America," 



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

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



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. 

 Baeboza dee Bocage, Dr J. V., " Sur quelques Mammiferes pen 



coimus, d'Afrique Occidentale, qiii se trouvent au Museum de 



Lisbonne," Proc Zool. Soc, 1865, pp. 401-404. {Bayonia vi'htj- 



vel Potamogale velox.) 

 Beandt, J. R, " On Solenodon," Memoirs of the Imperial Academij 



of St Peterslurg, 1832-3. 

 CouES, Elliot, " Precursory Notes on American Insectivorous 



Mammals with Description of New Species," U. S. Surivy. 

 "On Scapanus Americanus," American Naturalist, No. 13, 



p. 189 (1879). 



' In this paper, besides the excellent figures illustrating the anatomy of this, 

 tlie 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. 



