102 BULLETIN 3(1, UNITED STATES NATIONAL MUSEUM. 



about for some timo between the genera Phocwna and DclphlnuR^ must, 

 it' my determination is correct, be placed in tlie genus Lagenorhynehus. 

 Tlie type -mandible from Hawaii agrees perfectly with that of the speci- 

 men of Z/. electra in the Paris Museum, which is, fortunately, from the 

 same locality. It agrees also with the type (Brit. Mus., No. 358a) of 

 that species. It may seem unwise to attempt to determine a species of 

 Lagenorhynehus from the jaw alone, and in most cases I believe tliat it 

 would be so. But the mandible of L. elcetra is so peculiar in its stout 

 form and rounded coronoid region that it is at once distinguishable. 



A difticulty now arises, however, because there is a decided lack of 

 agreement between Peale's figures of P. jiectoralis and Owen's figures 

 of L. fmiformis, which, if my conclusions are correct, represent the 

 same species. It should be remembered, however, that Owen described 

 the external appearance of his species from drawings of an Indian 

 artist,* while Peale had the specimen which he figured before him in 

 the tiesh. The animal figured by Professor Owen is represented as hav- 

 ing a distinct, elongated beak, a character which arouses my suspicion 

 of the accuracy of the drawing, for the reason that it is at variance 

 with the shape of the head of all other species of Lagenorhynehus of 

 which the external appearance is known. 



The external measurements agree fairly together, but count for little, 

 since those of L. fusiformis were apparently taken from the drawing.? 



Tbe descriptions of color agree but little, though the discre[)ancy 

 may perhaps be due to the fact that the Indian specimen may not have 

 been entirely fresh. The descriptions are as follows : 



Phoccena pecforalis. 



Color, blue-black ; a white spot ou 

 each side of the breast in front of the pec- 

 toral fins; a frontal band of light slate- 

 color extends a short distance behind the 

 eyes; A^ent and abdomen light reddish- 

 white; lips margined with reddish white. 

 (Peale, U. S. Exi^lor. Exped. Manini. 

 & Onuith., 1848, p. 32.) 



Lagcnorliyiichus fusiform is. 



The color of the spindle-shaped Dol- 

 phin is less darkly plumbeous than in the 

 Gadamu, and becomes more gradually 

 lighter towards the belly; the dorsal lin, 

 the fore part of the pectoral and caudal 

 fins, and the snout have the darkest pig- 

 ment; the light ashy-gray belly shows 

 no spots. (Owen, T. Z. S. vi, p. 23.) 



We have, therefore, two specimens who.se bones (so far as we know 

 them) are alike, but whose external appearance is r( [irescntcd as widely 

 different. As there are, so far as I am aware, no casts or mounted skins 

 of L. electra in any museum we must peiid judgment until more n)a. 

 terial has been collected. I believe, however, that the figure of P. pec- 

 toralis will be found to be essentially correct. 



The reference to L. cleetra in the "Osteographie des Cetaces" (i). nOT) 

 is very much confused. Tliree distinct specimens are leferred to as 

 figured iu pi. xxxvi (fig. 0). The figure seems to be taken from No. 



"Trans. Zool. Soc, London, vi, ISiiD, p. 17, jil. v, (ig. 1. 



tin the legend acci)mi>anyiug the plates of Professor Owen's Memoir (1. c, p. 4(;), 

 the figure of L. fusiformis is said to be "dirainislied to scale." This scale is not that 

 given ou pi. v, but is apparently 7^ in. =6 feet. 



