490 



PROF. FLOWKR ON THE DELPHINIDdE. [NoV. 20, 



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

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

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

 only species of tlie last, Leucaphurus 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 ^Nfuseum, Lafjenorhyn- 

 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 Lagenorhynchm acutus. 



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

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

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

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

 to the section Clymeuia, 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 tJie 

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

 has beeu suggested that D. cruciyer, 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 Delphiiius ftzroyi of "Waterhouse (Zool. 

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



