10 STUDIES OF TASMANIAN CETACEA. 



the genus Mesoplodon, as can those of Tursiops, and 

 Globicephalus, by the less production of the posterior ar- 

 ticular end of the perotic. In this connection Tursioiis is 

 intermediate, showing a more or less style-like extension 

 that cuts it off from ear bones of either Delphinus, or 

 Globicephalus. Mesoplodon, however, of all the whales 

 named, is, at the point indicated, both extended and 

 truncated. Minor variations of the foramina, etc., are not 

 easily detailed in anything but an illustrated monograph, 

 although interesting enough to the student. 



DESCRIPTION OF PLATES. 

 Plate I. 



This shows a photograph of Maingon Bay, Tasman's 

 Peninsula, with Cape Raoul in the distance. In the fore- 

 ground can be seen the dolphins springing out of the 

 wave as it broke upon the shore. While this gives some 

 idea of the scene, it does not convey any idea of the num- 

 ber of dolphins in the bay, or the number that could often 

 be seen in the surf at one time. Owing to the very dull 

 light, and the great rapidity with which the animals per- 

 formed their aquatic evolutions, it was exceedingly diffi- 

 cult to obtain a photograph of the event. Of the many 

 photographs, those taken by Mr. F. B. Cane give the 

 best effect, and we have to thank him for allowing us to 

 use them to illustrate these notes. 



Plate II. 



Two young dolphins captured in the River Derwent. 

 The irregularity of outline is due to the mounting. (Tas- 

 manian Museum, Reg. Nos. D591 and 592.) 



Plate III. 



Articulated Skeleton of Delphinus del phis (fosteri?) 

 (Tasmanian Museum, Reg. No. D590.). 



Plate IV. 



Skull of Delphinus delphis. 

 (Tasmanian Museum, Reg. No. 4680.). 



Plate V. 



Skull of Delphinus delphis. 

 (Tasmanian Museum, Reg. No. 4425.). 



