LAGENORHYNCIIUS ACUTUS. 85 



2. Laf/oiorliipicliiiH cdriiJeo-albus Gr;iv. 

 Founded on Delplihitis cdruleu-aJhus, Meyers. 



I reject this species on account of tbe shape of its hear! and tlie color- 

 ation, wliich seem to me characteristic of Prodelphimifi. The t.vi)e skull 

 \^ thiit of a, ProdelpMmis. (See page 62.) 



3. Lagenorkijnchus albirostratus (?) Dall. 



Scamraou's Marino Mammalia, 1874, Appendix, p. 293. 



Mr. Dall refers to the Delphi nus albirostratus of Peale (which he assigns 

 to the genus Lagenorhynchus), a skull obtained by Captain Marston in 

 the Pacific. Ha does so apparently because Captain Marston's descrip- 

 tion of the exterior of the individuals of the school froui which the speci- 

 men in question was obtained seemed to him to agree with the descrip- 

 tion of Peale's J), albirostratus. I am inclined to believe, however, after 

 studying the measurements of the skull, that Captain Marston's speci- 

 men should be referred to Prodclphins doris. Whether Z>. albirostratus, 

 Peale, should also be referred to that species must always be more or 

 less uncertain, because it is only kuown from the exterior. Whatever 

 decision may be finally reached regarding that species, it seems to me 

 best for the present to refer Mr. Ball's specimen to Prodelpliins rather 

 than to Ijagenorhynchus. 



4. Lngenorhyiichus dp. Castchiaii Van Bencdeu. 

 Bull, do I'Acad. R. Bclgiquo, 2'"« s6i:, xxxvi, 1873, p. 38, fig. 2. 



This name has been applied by Professor Van Beneden to a figure of 

 a young dolphin, executed by the Comte de Castelnau. From the fact 

 that the name was not given in Latin form it is evident that it was not 

 intended as a formal scientific appellation, but simply as a common 

 name, i. e., Casteluau's Lagenorhynchus. 



Judging from the form of the head and the coloration I am inclined 

 to believe that the figure represents a young Beliihinus delphis, and I 

 shall therefore omit further reference to it. 



REVIEW OF THE VALID SPECIES OF LAGENORHYNCHUS. 



LAGENORHYNCHUS ACUTUS Gray. 



Delphinus acutiis, Gray, Spic. Zool., 1828, p. 2. 



Lagenorhynchus acutus, Gray, Zool. Erebns and Terror, 1846, pl.xii. 

 Delphinus eschrichtii, Schlegel, Abb.Gebiete Zool., etc., 1841, p. 23. 

 J>elphinus leucopleitriis, Rascb, Nyt Mag. for Naturvidens., iv, 1843, p. 97, pis. 2, 3. 

 Leucopleurus arct'icus, Gray, Synopsis Whales and Dolphins, 1868, p. 7. 

 Liujenorhynchns perspicillatm, Cope, Proc. Acad. Nat. Sci. Philadelphia, 1876, p. 136. 

 Lagenorhynchus gubernator, Cope, Proc. Acad. Nat. Sci. Philadelphia, 1876, p. 138, 

 pi. IV. 



It is much to be regretted that the type of Gray's 7). acutus is lost, 

 as Professor Flower's painstaking investigation seems to prove it to be. 



