LAGENORMYNCHUS ACUTUS. 85 



2. Layoiorhynchus caTuleo-albus Gray. 

 Founded on IHlpltinus cfvruleo-alhus, Meyers. 



I reject this species on account of the shape of its head and the color- 

 ation, which seem to me characteristic of Prodelphinus. The type-skull 

 is tliat of a Proflelphrnns. (See page 62.) 



3. Lagcnorlnjnchus alhirostratus {'!) Dall. 



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



Mr. Dall refers to the Delphin us alhirostratus of Peale (which he assigns 

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

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

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

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

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

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

 men should be referred to Prodelphins doris. Whether D. albirostratuSj 

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

 less uncertain, because it is only known 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 Prodelphins rather 

 than to Lagenorhynchus. 



4. Lagenorhynchus de Casielnau Van Bencden. 

 Bull, do I'Acad. R. Belgiqne, 2">'^s6r., xxxvr, 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 Delphinus dclphis, and 1 

 shall therefore omit further reference to it. 



REVIEW OF THE VALID SPECIES OF LAGENORHYNCHUS. 



LAGENORHYNCHUS ACUTUS Gray. 



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



Lafjenorhijnchus acntus, Gray, Zool. Erebus and Terror, 184(5, pl.xil. 

 Delphinus eschrichtn, Schlegel, Abh. Gebiete Zool., etc., 1841, p. 23. 

 Delphinus leucopleurns, Rascb, Nyt Mag. for Naturvidens., iv, 1843, p. 97, pis. 2, 3. 

 Leucnpleurus arcticus, Gray, Synopsis Whales and Dolphins, 18G8, p. 7. 

 LcKjenorhiinclmsperspicillatus, Cope, Proc. Acad. Nat. Sci. Philadelphia, 1870, p. 13(5. 

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

 pi. IV. 



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

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



