272 . GET ACE A 



one-fourth the length of the ramus ; other cranial characters as in 

 the preceding genus. Teeth \ to f 4, of comparatively large size 

 (5-6 mm. in diameter) ; surface of their crowns finely grooved. 

 Vertebrae: 07, D 12, L 15, C 32 ; total 66. Kepresented by 

 S. rostratus, from which the forms which have received other names 

 are probably not specifically separable. 



Sotalia. 1 Pterygoids narrow, not meeting in the middle line, 

 and in their inner borders diverging posteriorly, instead of being 

 parallel as in the preceding genera ; other cranial characters much 

 as in Steiio. Teeth tolerably large (4-5 mm. in diameter), f $ to f f, 

 with smooth enamelled surface. Vertebrae : C 7, D 12, L 10-14, 

 C 22 ; total 51-55. Pectoral fin broad at base, the breadth being 

 caused by the considerable development and position of the two 

 outer digits. Six species are provisionally recognised as distinct, 

 including the Chinese White Dolphin (S. sinensis) and S. pallidus 

 from the river Amazon. 



Bibliography of Cetacea. D. F. Eschricht, Untersuchungen ilber die Nordischcn 

 Wallthiere, 1849, contains a copious bibliography of the group up to the date of 

 publication. Since that time numerous monographs on special families and 

 genera have been published, and a large illustrated general work, Osteographie des 

 Cetaces, by P. J. Van Beneden and P. Gervais, 1869-80. Besides those already 

 referred to in the footnotes, the following may be mentioned ; viz. J. F. Brandt, 

 " Untersuchungen iiber die Fossilen und Subfossilen Cetaceen Europa's," in 

 Mem. de I'Acad. Imp. de St. Petersbourg, 7 ifeme ser. vol. xx. 1873 ; C. M. Scammon, 

 Marine Mammals of the N. W. Coast of North America, 1874 ; W. H. Flower, 

 " On the characters and Divisions of the Families of the Delphinidae," Proc. Zool. 

 Soc. 1883, p. 466, and List of the Spccimeiis of Cetacea in the British Museum, 

 1885 ; F. W.True, "Review of the Family Delphinidaj, " Bull. U.S. Nat. Museum, 

 No. 36, 1889 ; P. J. Van Beneden, Histoire Naturellc des Cetaces des Mers 

 d' Europe, 1889. 



For fossil forms, in addition to the works of Van Beneden, Gervais, and Brandt, 

 already cited, the reader may refer to various memoirs published by the former 

 writer in the Bull. Ac. . Belgiqiie and Ann. Mus. E. Hist. Nat. Belg. 

 See also R. Lydekker, " The Cetacea of the Suffolk Crag," Quart. Journ. Geol. 

 Soc. vol. xlii. p. 7 (1887), and Catalogue of the Fossil Mammalia in the British 

 Museum, pt. v. (1887). 



1 Gray, Cat. Seals and Whales Brit. Mus. 2d ed. p. 393 (1866). 



