EXPLANATION OF PLATES. 



PLATE VIII. 

 Rattus hawaiiensis, type. 



PLATE IX. 



Material from Kahoolawe; No. 9032, Mus niusculus. Other rat material, 

 Rattus hawaiiensis. Nos. 9027 and 9029 from young specimens. 



PLATE X. 

 Part of Oahu, showing location of Heleloa and Popoia. 



PLATE XI. 

 Popoia Islet. 



South shore, showing erosion. 



PLATE XII. 

 Popoia Islet. 



Upper figure. vShore pool showing erosion : looking outward. 

 Lower figure. Surface of northern part. 



PLATES XIII, XIV. 



Rattus hawaiiensis, cf No. o, 9 No. 9040. Height of drinking cup is 

 68 mm. 



PLATE XV. 



Hawaiian pulmonates attacked by rats. Explanation on plate. 



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