188y.J PROF. FLOWER ON THE DELPHINIDiE. 507 



Delphlnus eutrojna, Gray, P. Z. S. 1849, p. \, = Eutropia dicJciei, 

 Gray, Synopsis, p. 7 (18G8). 



These are all from the Southern Hemisphere. The last is quite 

 distinct from all the others, 



Orcella. 



OrcaeUa, Gray, Cat. Seals and "Whales Brit. Mus. p. 285 (1866). 



Orcel/a, J. Anderson, P. Z. S. 1871, p. 142. 



Pterygoids widely separated from each other. Teeth ^^ to ^, small, 

 conical, pointed, rather closely set and occupying nearly the whole 

 length of the rostrum. Vertebrae 62 to G3. Manusof moderate size, 

 not elongated, but somewhat pointed. All the bones of the digits 

 broader thanlong,excepttheproximal phalanges of the indexand third 

 fingei s. Dorsal fin rather small, placed behind the middle of the body. 



Two species, both of small size — 0. brevirostris, from the Bay of 

 Bengal, and O.fiuminalis, from the Irawaddy river, from 300 to 900 

 miles from the sea. Our knowledge of these is almost entirely due 

 to Dr. J. Anderson ('Anatomical and Physiological Researches, com- 

 prising an Account of the Zoological Results of two Expeditions to 

 Western Yunnan in 1868 and 1875:' 1878). 



Orca, Gray, Zool. Erebus & Terror, p. 33 (1846). 

 Teeth about ~„ occupying nearly the whole length of the rostrum, 



very large and stout, with conical recurved crowns, and large roots, 

 expanded laterally and flattened or rather hollowed on their anterior 

 and posterior surfaces. Rostrum broad and flattened above, rounded 

 in front ; premaxillse broad and rather concave in front of the nares, 

 contracted at the nuddle ol the rostrum, and expanded again towards 

 the apex. Pterygoids of noi'mal form, but not quite meeting in the 

 middle line. Vertebrae: C. 7, D. 11-12, L. 10, C. 23; total 51 or 

 52. Bodies of the first and second and sometimes the third cervical 

 vertebrae united, the rest free. Pectoral flu very large, ovate, nearly 

 as broad as long. All the plialanges and metacarpals broader than 

 long. Dorsal fin near the middle of the back, very high and pointed. 

 Anterior part of the head broad and dejiressed. 



All large, powerful, and rapacious animals (15 to 20 feet long) ; 

 tliey occur in almost all seas from Greenland to Tasmania. Many 

 species have been descrihed (0. gladiator, duhameli, schleyeli, lal.i- 

 roslris, minor, eschricMi, utenorhyncha, capensis, mayellanica, recti- 

 pinna, atra, destructor, pacijica, &c.), but their specific difl'erential 

 characters, if any, have never been clearly defined. 



PsEUDORCA, Reinhardt, Oversigt Kong. Danske Videusk. Selskabs 

 Forhandl. p. 151 (1862). 

 Teeth about ^. Cranial and dental characters generally hke 

 those of Orca, except that the roots of the teeth are cylindrical. 

 Vertebrae: C. 7, D. 10, L. 9, C. 24; total 50. First to sixth or 

 seventh cervical vertebrae united. Bodies of tiie lumbar vertebrae 



