134 PROCEEDINGS OP THE ACADEMY OP 



One skull of type B, of an undetermined species, 1 shows, among 

 some peculiarities that I regard as simply specific, the presence 

 of small and slender but perfectly plain basipterygoid processes, 

 of which I see no trace in any other specimen. 



As already intimated, I cannot say whether or not these cranial 

 types shade into each other, or whether species not examined do 

 not show something different from either of these three patterns, 

 nor, finally, with which one of the three the unexamined species may 

 aoree. It seems to me that the species minor agrees so closely in 

 external characters with C that its reference to the genus Sphe- 

 niscus is warranted. For the same reasons, the species antipodes 

 seems allied to B. In the uncertainty at present attaching to 

 papua, adeliee, and antarctica, it may be best to leave these to 

 stand on their own merits in the genus " Pygoscelis," which, how- 

 ever, can then only be characterized by the extreme length of the 

 tail and the feathering of the bill, since the form of the bill differs 

 o-reatly in each of the three. These genera would correspond 

 very nearly with the sections Dr. Schlegel has indicated, and are 

 exactly those of Prof. Hyatt. The latter has shown how difficult 

 it is to define the genera, seeing that they vary with whatever 

 character we take as our guide. On the whole, I think it most 

 probable that no more than three genera will be finally deter- 

 minable, namely, Aptenodytes, Eudyptes, and Spheniscus, though 

 the second of these may contain subgenera, based upon shape 

 and feathering of the bill, presence or absence of crests, and 



length of tail. 



The cranial characters just described will be readily appreciated 



by reference to the accompanying figures (Fig. 4), kindly drawn for 

 this paper by my friend, Frof. Morse. It was not thought neces- 

 sary to o-ive a figure of Aptenodytes, as a beautiful engraving has 

 already been presented in Frof. Brandt's invaluable article. These 

 figures are all of two-thirds size; those representing vertical views 

 show the skull from above, on the one side, and from below 

 (with the mandible removed) on the other side, of the median 



lengthwise line. 



In its general characters the skull conforms to the ordinary 

 pygopodous type. The palate is schizognathous. The inter- 



It seems to be not one of the crested species, and I suspect that it is " Da- 

 syrllamphus ,, adeliw, but there is no certainty about this. 



