238 DR. J. E. GRAY ON BRITISH CETACEA. [May 24, 
Lagenorhynchus, Gray, Zool. E. & T. 34; Cat. Cetac. 94; P.Z.S. 
1863. 7 
* Beak short ; beak of skull only as long as the brain-cavity ; 
teeth nearly to the notch. 
LAGENORHYNCHUS LEUCOPLEURUS. White-sided Bottlenose. 
Delphinus tursio, Knox, Cat. Prepar. Whales, 29; Ann. & Mag. 
N. H. 1864, xiv. t. 3. 
Delphinus leucopleurus, Rasch, Nyt Mag. for Naturv. iv. 97; Mag. 
Zool. 1843, p. 363; Nilsson, Scand. Fauna, 598. 
Lagenorhynchus leucopleurus, Gray, Zool. E. & T. 34, t. 3, t. 12, 
t. 26. f.3; Ann. & Mag. N. H. 1864. 
Hab. North Sea. Orkney, May 1835 (Knor); skeleton, Mus. 
University of Edinburgh. 
Lagenorhynchus? nilssonii. Nilsson, in the ‘ Scandinavian Fauna,’ 
records a species under the name of Delphinus obscurus, and refers 
it with doubt to the description and figure of the skull, and the spe- 
cies under that name, in the ‘ Zoology of the Erebus and Terror,’ 
and equally with doubt to D. superciliosus of Schlegel. Both these 
species are described from the same specimens, which were procured 
at the Cape of Good Hope, and therefore very unlikely to be of a 
species found also in the North Sea. Nilsson’s species may very likely 
be found in the British Seas ; so I have referred to it to draw zoolo- 
gists’ attention to the description. It is the only Swedish species 
that has not hitherto been observed here. 
** Beak moderate; beak of skull only as long as the brain-cavity ; 
teeth not quite to the notch in the beak. 
LAGENORHYNCHUS ALBIROSTRIS. White-beaked Bottlenose. 
Delphinus tursio, Brightwell, Ann. Nat. Hist. 1846, p. 21, t. 1, 9. 
Delphinus albirostris, Gray, Ann. & Mag. N. H. 1846; M. Clau- 
sius, Dissertat. de Lagenorhynchis, Kiliz, 1853. 
Delphinus ibsenii, ‘‘ Eschricht, 1847;” Nilsson, Scand. Fauna, 
600. 
Lagenorhynchus aibirostris, Gray, Zool. E. & T. t. 10. 
Delphinus pseudotursio, Reichb. Cetac. t. 24. f. 7, from Bright- 
well. 
Delphinus (Lagenorhynchus) albirostris, Van Beneden, Nouv. 
Mém. Acad. R. Brux. xxxii. t. 1, 2 (animal, skeleton, and viscera). 
Hab. North Sea, Faroe Islands. Yarmouth, 1846 (Brightwell) ; 
skeleton in British Museum; skull figured in Zool. E. & T. 11. 
Ostend, July 1851, female. Winter 1852, female (Van Beneden, 
l. ce. p. 20). 
Bladebone broader than high, with long acromion and a promi- 
nent articulation (t. 2. f.9). Arm-bones very short; fingers four, 
short, outer longest, second rather shorter, third and fourth very 
short. Ear-bones large (see Van Beneden, /. c. t. 1. f. 7 & 8). 
Pir 
