74 CETACEA. 



Family PLATANISTID^. 



In the existing genera the jaws are long and narrow, with 

 numerous simple teeth, the length of the mandibular symphysis 

 exceeding half the length of the ramus. All the cervical vertebrae 

 are free, and in the hinder dorsals the tubercular and capitular 

 attachments of the ribs are blended. In laia the transverse pro- 

 cesses of the lumbar vertebrae are of great antero-posterior width. 



The two following genera are usually referred to the present 

 family' (see Probst, Jahresh. Yer. Nat. Wurtt. 1886, p. 117), 

 although Schizodeljfhis approaches the delphinoid genus Stena. 



Genus CHAMPSODELPHIS, Gervais^ 

 The lumbar vertebrae of this genus have extremely wide trans- 

 verse processes, indicating affinity with Inia ; the teeth also resemble 

 those of the latter genus. 



Champ sodelphiS) sp. 



Hah. Russia. 



M. 40514. An early lumbar vertebra, wanting one epiph5'sis and 

 otherwise slightly imperfect ; from the Lower Pliocene of 

 the Crimea. In general characters, and especially the 

 great antero-posterior diameter of the transverse processes, 

 this specimen agrees very closely with the fourth lumbar 

 vertebra of Inia. Purchased, 



Genus SCHIZODELPHIS, Gervais^ 



The form of the rostrum presents a great resemblance to that of 

 the delphinoid genus Steno, but the mandibular sj^mphysis is con- 

 siderably longer. 



Schizodelphis sulcatus, Gervais*. 



Syn. Dclphinorhynclms sulcatus, Gervais^ 

 Delphinus jJseudodelphis, Gervais ^. 



This is the type species, and is of nearly the same size as the 

 existing Steno. 

 Mab. Europe. 



^ Frequently termed the Belphinorh/nchidcB. 



^ ZooL tt Pal. Fran9aises, 1st ed. vol. i. p. 152 (1848-52). . 



^ Mem. Ac. Montpellier, vol. v. p. 12G (18G1). 



^ Bull. Soc. Geol. France, ser. 2, vol. x. p. 312 (ISbo).— Beli^hinorhynchus. 



® Loc. cit. 



° Ext. Proe.-Verb. Ac. Montpellier, 1849, p. 11. 



