BY H. H. SCOTT AND CLIVE E. LORD. 17 



mature male, with all the epijDliyses of the vertebrse open, 

 is close to the stature of the female. The following charac- 

 ters were noted, as marking the female off from the mature 

 and immature males. 



1. Diapophyses of the dorsal ribs longer than in the 

 other two animals. 



2. First, cervical, neiU-ral spine covers more vertebrae. 



3. No bicipital groove between head and trochanter 

 of the humerus. Articular surfaces set at a more oblique 

 angle (l^)- 



4. Supra scapular rim was centrally elevated, and not 

 depressed, and the pre, and post, scapular fossae made a 

 nearer approach to the roughened foss-^ of Ttirsiops than 

 either of the other specimens here detailed. 



We hope in our next paper to give exhaustive data re- 

 lating to sex vaiiations in the genus TurHops, and the 

 notes here supplied will receive added value from tne 

 light thus thrown upon a vexed question. 



In conclusion, we desire to express our thanks to Mr. 

 John Arnold, Chief Assistant of the Tasmanian Museum, 

 for the willing and courteous assistance rendered to us 

 during the examination of the specimens. 



DESCRIPTION OF PLATES. 



Plate I. 

 Articulated skeleton of Pseudorca craasidens from 

 avdventure Bay, Tasmania. 



Plate II. 

 Skull of Orca gladiafnr. 



Plate III. 

 Cervical vertebrae and first doxsal of Orca gladiator. 



Plate IV. 

 Four vertebrae of the Dorsal Series (0. gladiator). 



Plate V. 

 Five vertebrae of the Lumbar series (0. gladiator). 



Plate VI. 

 Four chevron bearing vertebrse (0. gladiator). 



Plate VII. 

 Sternum of Orca gladiator. 



Plate VIII. 

 Series of Ribs of Orca gladiator (showing broken ribs). 



Plate IX. 

 Skull of Glohicephalus mclas. 



'(12) These arm bones are only provisionally associated witli this 

 skeleton, and may not belong to it. Various dolphin remains — 

 evidently odd scraps of later date than Dr. Crowthei-'s specimens — 

 had been added to the box from time to time ; these included some 

 Tursiops bones of no value. , 



B 



