18 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



a small inaccessible cave, which had its opening at the water's 

 edge. T^yo females taken at Iguana Cove on March 21, 1906, 

 contained well-developed eggs. 



Nearly all of the specimens taken were very fat, and occa- 

 sionally a bird was taken in which the webs of the feet were 

 slit. In an immature specimen (No. 342 C. A. S.) the 

 anterior edge of each flipper shows a healed injury, which in 

 the right flipper is a deep indentation. Each of these injuries 

 appears to have been caused by a severe bite when the bird 

 was small. 



The description of the immature plumage by Messrs. 

 Rothschild and Hartert^ fits four of the Academy's specimens 

 exactly. The measurements of the Academy's series of thir- 

 teen adults, however, do not confirm their statement that "The 

 female differs from the male at a glance in being much smaller." 

 A large male might be distinguished from a small female, but 

 a medium-sized or small male could not be distinguished from 

 a large or medium-sized female. 



Every specimen in the Academy's series of seventeen exhibits 

 anywhere from two to about thirty-three dusky feathers 

 among the pure-white ones of the breast and abdomen. An 

 apparently similar condition, attributed to melanism, is stated 

 by Sir Walter Buller^ to exist in certain specimens of the Yel- 

 low-crowned Penguin (Megadyptes antipodum). 



None of the specimens in the Academy's series show moult 

 in progress. When in worn feather, the dusky portions of the 

 plumage assume a brownish cast, while in fresh plumage they 

 are grayish. Table III, p. 112, gives the general condition 

 of the plumage of each specimen, as well as the measurements 

 of the specimen in millimeters. 



In the flesh. No. 343 measured 480 mm. in length, and 375 

 in extent; while No. 354 measured 490 in length, and 394 in 

 extent. 



The extreme and average measurements in millimeters of 

 the adult males and females follow: Males — Flipper 149-166 

 (156) ; tail 23-39 (27) ; culmen 57.4-61.1 (60.2) ; tarsus 26- 

 31.6 (29) ; middle toe and claw 56.8-62.5 (60.2). Females— 

 Fhpper 140-155 (149); tail 19-30 (26); culmen 56-57.4 



^Nov. Zool., V. 6, p. 199. 

 ^Supplement Birds N. Z., v. 1, p. 94. 



