320 THE PROCEEDINGS OF THE LTNNEAN SOCIETY 



important for purposes of comparison. Lastly, I have to thank 

 Mr. W. A. Haswell, who has taken the trouble to translate into 

 English my Grerman manuscript. 



In writing down these remarks, the incompleteness of the 

 research, in many parts, has often struck me ; questions which T 

 was not in a position to answer presented thomselves on all sides. 

 Fain would I have filled up these hiati, time, however, would 

 not permit. I allow myself, then, to publish these imperfect 

 researches, since much that is new (the brain of H. Phillipi*, the 

 dentition of H. galeatus) has been gained by this investigation ; 

 and since, in the second place, I cannot tell, on account of my 

 nomadic mode of life, when and where I shall have the oppor- 

 tunity of prosecuting this work further. 



As regards the material, which has served for the carrying out 

 of this part of the work, for the species H. PhilUpi, I have had 

 no lack of material ; during the now seven months of my stay in 

 Sydney, I have obtained for investigation, thanks to the assistance 

 of the Hon. William Macleay and Mr. E. P. Ramsay, seven or 

 eight fresh specimens. No embryos, unfortunately ; the youngest 

 animal of this species that I have seen was 225 mm. (8*9 inch) 

 in length, the largest 1010 mm. (4'33 in.) 



For the species H. galeatus, I had only owe specimen (belonging 

 to the Australian Museum) " to look at," as well as a pair of 

 jaws of this shark in the Macleay-Museum. 



Of the species H. Francisi, I have also had only one specimen 

 " to look at " — that preserved in spirit in the Macleay-Museum. 



ON THE DENTITION OF THE HETERODONTI. 



1. — Dentition of the young Heterodontus Phillipi. Bl. 

 The peculiar dental armature of the Heterodonti, assigning 

 them as it does a characteristic and seemingly isolated position 



* The description of the brain will appear in part III. of my "Contributions to Com- 

 parative Neurologfy." 



