638 SIR SIDNEY HAUMER ON COMMERSON's DOLPHIN. 



EXPLANATION OF THE PLATES. 

 Plate I. 



Ceplialorlii/nchus commersonii. 



Figs. 1 & 2. Mr. J. E. Hamilton's eviscerated specimen (A), lateral and ventral 

 views. X t\. 



Fig. 3. Ventral view of anotlier individual (C). From a photograph sent by 

 Mr. K. Vallentin. 



i Plate IL 



Ceplialorhynclivs commersonii. 



Fig. 1. Side view of specimen C. From a second photograph sent by Mr. R. 

 Vallentin. 



Fig. 2. Skull of specimen A, dorsal view. X about g-. 



C. heavisidei. 

 Fig. 3. Skull of the type-specimen, dorsal view. X about f . 



Plate III. 



Cejphalorhiinchus spp. 

 Fig. 1. C commersonii. Skull of specimen A, ventral view. X about i. 

 Fig. 2. Lower jaws, from the right side. X about -t. 



a. C. heavisidei. Ti'pe-specimen. 



h. C. commersonii. Specimen A. 



c. C. etitropia. Type-specimen. 



