96 HrPEBOODONTIDiE. 



1. Pontoporia Blainvillii. B.M. 



. Pontoporia Blainvillii, Gray, I. c. p. 231 ; Synops. Whales ^ Dolph. 

 p. 5, t. 29 (skull); Flower, Tram. Zogl. Soc. vi. p. 106, t. 28 (skull); 

 £urmeister, An. Mus. P. jBuenos Ayres, i. p. 387, tab. 23 (animal), 

 tab. 25 & 26 (skeleton). 



Inhab. South Atlantic, Monte Video. 



The animal figured by Gervais as Delphinv,s (StenodeJphis) Blain- 

 villii (Voy. Amdr. Merid. t. 23) differs from Burmeister's figure in 

 having an elongated subfalcate pectoral fin, and a higher dorsal, and 

 a broad white streak, commencing from the blower and extending 

 down the back to near the tail. If this is not a figure of the animal 

 seen at sea, which I suspect it must be, it must be a different species. 



Suborder VI. ZIPHIOIDEA. 



Ziphiidae, Gray, Cat. S. Sf W. p. 326. 

 Ziphioidea, Gray, Synops. Whales ^ Dolph. p. 9. 



Head beaked. Nostrils two, united into a single transverse or 

 crescent-hke blower on the centre of the back of the crown. Teeth 

 only in the front or sides of the lower jaw, fitting into pits in the 

 upper one. Dorsal fin falcate. Pectoral fin ovate, small, low down 

 on the side of the body : fingers short, 4- or 5-jointed ; second 

 and third the longest ; fourth rather shorter ; first and fifth rather 

 short. Cervical vertebrae more or less united into one mass. 



FamUy 16. HYPEROODONTID^. 



Hyperoodontina, Gray, I. c. p. 327. 



Hyperoodontidee, Gray, Synops. Whales 8f Dolph. p. 9. 

 Blower lunate. Beak of the skull with a high crest on each side 

 above, formed by the elevation of the maxillary bones in front of the 

 blower. Teeth 2 or 4, in front of the lower jaw, conical. Cervical 

 vertebrae united into one mass. 



1. HYPEROODON. 



Hyperoodon, Gray, I.e. pp. 327, 328; Synops. Whales Sf Dolph. p. 9. 



Beak of the skull bent downwards : crest of the back of the beak 

 sharp-edged, above as high as the occiput. 



Vertebrse 44 or 45 :— C. 7 (all united into one solid mass). D. 9. 

 L. 10. C. 18 or 19. ' 



