490 



PROF. FLOWER ON THE DELPHINID/E. 



[Nov. 20, 



albirostris in a genus by itself, for which he reserves the name 

 Layenorhynchus, and forms two other genera, Electra and Leuco- 

 pleurus, for the others ; but it is highly probable that the type and 

 only species of the last, Leucapleurus arcticus. Gray, is identical 

 with Electra acuta, Gray, of the same list. The only distinguishing 

 characters given for these two genera are — Electra, "tooth-line 

 stopping considerably short of the notch ;" Leucopleurus, "tooth- 

 line reaching nearly to the notch." 



Of the skulls of this group in the British Museum, Lagenorhyn- 

 chus (or Electra) asia, Gray, except for its somewhat inferior size, 

 appears to be the same as L. electra {Electra obtusa of the Synopsis). 

 L. fusiformis, Owen (Trans. Zool. Soc. vol. vi. p. 22), from the 



Fig. 8. Palate of Lagenorhynchus acutus. 



Madras seas, appears to be the same or a closely allied species. 

 Electra tMcolea, founded on a single skull stated to have been 

 brought from the west coast of North America, has a longer and 

 narrower rostrum than any of the others, and forms a transition 

 to the section Clymenia, if it is not identical with species which 

 Gray places in that group. L. clanculus (Gray, P. Z. S. 1849, 

 p. 2) appears to be a distinct form. The type specimen is from 

 Dr. Dickie's collection from the Pacific Ocean, and is figured 

 among the supplementary plates of the Cetacea of the ' Erebus ' and 

 ' Terror ' voyage. There is a similar skull in the Museum of the 

 College of Surgeons from the Pacific coast of North America. It 

 has been suggested that D. cruviger, Quoy and Gaimard (Voy. de 

 rUranie, 1824), and D. bivittatus, Lesson and Garnot (Voy. de la 

 Coquille, 1826), may be the same as Gray's i. clanculus; but as 

 they are only known by descriptions and drawings made of animals 

 swimming at sea, the identifications are very doubtful. There 

 is also the possibility that Delphimu fitzroyi of Waterhouse (Zool. 

 Voy. 'Beagle,' p. 25, 1840), from the coast of Patagonia, may be 



