from the tropical Indo- Pacific may be a 

 recognizable race. Much further study is 

 needed. 



Tursiops gilli Pall, 1873. Coast of southern 

 California and west coast of northern 

 Baja California; also the northern end 

 of the Gulf of California. This form ap- 

 pears to be a valid species (Robert L. 

 Brownell, personal communication). 



Genus GRAMPUS Gray, 1828 



Grampus griseus G. Cuvier, 1812 (white- 

 headed grampus; gray grampus; Risso's 

 dolphin). All temperate and tropical seas. 



Genus LAGENORHYNCHUS Gray, 1846 



This genus contains two well-defined species 

 in the North Atlantic and another in the North 

 Pacific. Biernnan and Slijper (1947-48) re- 

 garded all Southern Hemisphere forms as 

 conspecific, but Fraser (1966) showed that 

 there are probably three species. D. Z. 

 Gaskin (Massey University, New Zealand, in 

 litt.) confirmed the specific distinction of 

 Li. cruciger and 1^. obscurus . L. obliquidens 

 is closely related to L. australis. Further 

 studies are needed on the taxonomy and dis- 

 tribution of the southern forms. The species 

 electra is now placed in a separate genus, 

 Peponocephala . 



Lagenorhynchus albirostris Gray, 1846 

 (white-beaked dolphin). North Atlantic 

 from Davis Strait and Newfoundland east 

 to the Barents Sea and North Sea (rarely 

 to Portugal). 



Lagenorhynchus acutus Gray 1828 (Atlantic 

 white- sided dolphin). North Atlantic fronn 

 Massachusetts and southern Greenland 

 east to western Norway and the British 

 Isles. 



Lagenorhynchus obliquidens Gill, 1865 

 (North Pacific white- sided dolphin). 

 Waters off the coast of North America 

 from southeastern Alaska to Baja Cali- 

 fornia, and off the coast of Asia from 

 the Kuril Islands to Japan. 



Lagenorhynchus australis Peale, 1848 

 (black- chinned dolphin). Temperate 

 waters off southern South America and 

 the Falkland Islands. 



Lagenorhynchus cruciger Quoy and Gaimard, 

 1824 (hourglass dolphin). Temperate 

 waters of the South Atlantic and South 

 Pacific. A pelagic species, found chiefly 

 in waters immediately north of the Ant- 

 arctic Convergence (D. E. Gaskin, in 

 litt.). 



Lagenorhynchus obscurus Gray, 1828 (dusky 

 dolphin). Temperate waters off South 

 America, South Africa, Kerguelen Island, 



southern Australia, New Zealand, and 

 in the south- central Pacific. Primarily a 

 coastal species (D. E. Gaskin, in litt.). 



Genus LAGENODELPHIS Fraser, 1956 



Lagenodelphis hosei Fraser, 1956 (Sarawak 

 dolphin). Known from only one specimen 

 stranded at the mouth of the Lutong 

 River, Sarawak, Borneo. 



Genus STENELLA Gray, 1866 



Studies under way by F. C. Fraser of the 

 British Museum (Natural History) should do 

 much to clarify the taxononny of this genus, 

 which has long been confused. Pending the 

 publication of the results of his studies, we 

 offer the following tentative classification. 

 Most named forms of the genus fall into three 

 species groups or superspecies which are 

 sympatric in many areas: (1) The long- 

 snouted dolphins with about 50 teeth in each 

 jaw, and shallow palatal grooves. This group 

 includes S^, longirostris and S^. roseiventris . 

 These two forms differ markedly in body form 

 and color pattern, so we tentatively retain 

 them as separate species. Specimens appear- 

 ing in some respects to be intermediate, 

 however, have been described from Japan 

 (S. longirostris kunitomoi Kuroda, 1952). 

 (2) The spotted dolphins with shorter snouts, 

 about 37 teeth in each jaw, and no palatal 

 grooves. Many different "species" (e.g., 

 frontalis , attenuata, plagiodon , graffmani) have 

 been named, but Rice has seen in a single 

 school animals showing all described color 

 variations; no consistent cranial differences 

 have been described. Therefore we regard 

 them all as a single species, S. dubia, ad- 

 mitting that recognizable geographical 

 races may exist. (3) The striped dolphin, 

 S, caeruleoalba , with about 44 teeth in each 

 jaw, no palatal grooves, a dark stripe along 

 the flank, and no spots. Only one species is 

 recognized, 



Stenella longirostris Gray, 1828 (long- 

 snouted dolphin; eastern Pacific spinner 

 dolphin). Tropical Atlantic, Indian, and 

 eastern Pacific Oceans, 



Stenella roseiventris Wagner, 1853 (Hawai- 

 ian spinner dolphin). The type locality is 

 the Banda Sea, Indonesia. Fraser pro- 

 visionally applies this name to the Hawai- 

 ian spinner dolphin. 



Stenella dubia G. Cuvier, 1812 (spotted 

 dolphin; bridled dolphin). Tropical waters 

 of the Atlantic, Indian, and Pacific 

 Oceans, chiefly near coastal areas and 

 islands. 



Stenella caeruleoalba Meyen, 1833 (striped 

 dolphin; euphrosyne dolphin). Widely dis- 

 tributed in temperate and tropical waters 

 around the world. 



