134 CETACEA. 



The following species have been named only from figures or 

 very slight descriptions : 

 D. Senedetta, D. Commersonii, D. niger and D. Pernettii, 



Lacep. 

 D. Epidon and D. Mongitori, Rqfinesque. 



15. PONTOPORIA. 



Skull roundish; beak very long, compressed, with a strong 



groove on each side above; eyebrow with a long, cylindrical 



crest ; lower jaw compressed, with a deep groove on each side ; 



symphysis very long. Teeth small, subcylindrical, smooth, 



rather hooked, acute. 



Head with very long, slender beak. Dorsal fin high, falcate, 



central ; pectoral fins rather elongate, sublunate. 



Pontoporia, Gray, Zool. Ereb. fy Terror, 46, 1846. 



Delphinus, sp. Freminville. 



Stenodelphis, Gervais, D'Orb. Voy. Amer. Merid., not charac- 

 terized. 



1. PONTOPORIA BLAINVILLII. The PONTOPORIA. 



Skull, with the tubercles behind the blow-holes, broad, slightly 

 convex ; eye-brows with a strong, longitudinal crest ; upper and 

 lower jaw with a deep, well-defined ridge on each side. Teeth -f f , 

 small, conical, hooked, smooth ; symphysis more than half the 

 length of the lower jaw. 



Delphinus Blainvillii, Freminville, Mus. Paris. 



D. Blainvillei, Gervais, Bull. Soc. Philom. 1844, 38 ; Institute, 



1844. 

 D. (Stenodelphis) Blainvillei, Gervais * D 9 Orb. Voy. Amer. Merid. 



Mam. t. 23, skull; Reichb. Cetac. 128. 70. t. 24. f. 78. 

 Pontoporia Blainvillii, Gray, Zool. E. T. 46. t. 29, skull. 

 Inhab. Monte Video. Skull, Mus. Paris. M. Freminville. 



M. Freminville described the Dolphin belonging to the skull 

 as white, with a black dorsal band, and 4 feet long. 



in. lin. 



Length of skull 12 6 



of beak 8 



of symphysis 5 9 



of teeth-line 5 4 



M. D'Orbigny believes the dolphin he observed on the coast 

 of Patagonia, of which the following is a description, is probably 

 the same as Stenodelphis Blainvillei ; it is figured Voy. Amer. 

 Merid. t. 23. The skull of this animal was not examined nor 

 preserved. 



