PKODELrillKL'S LATERALIS. 

 Table of iniasurcmcnts — Contiuiied. 



65 



*Extreme. 

 PRODELPHINUS(?) LATERALIS Peale. 



Delphinit.':! lateralis, Peale, Marani. U. S. Expl. Exiied., Isfc ed., 1848, i>. 35, PL 



VIII, fig. 1. 

 Laf/enorhijnchus latcraJix, Cassin, Mamm. U. S. EspL Exped., 2d cd., 185^, p. 32, 



PL VII, fig. 1. 



Every student must be struck with the general resemblance of Peale's 

 figure to the figure of P. marginattis given by Pucheran.* The color of 

 the two type-specimens seems to have been similar, but there are cer- 

 tain differences which make it impossible to refer P. lateralis to P. margi- 

 natus without question. 



The general color of the upper surfaces of P. marginatum is represented 

 as black, while Peale's animal is said to have been "light purplish- 

 gray." It should be borne in mind, however, that the specimens of the 

 Ibriner species were drawn sometime after they were captured, while it 

 i.s probable that Peale's sketch was made immediately. The general 

 arrangement of the dark bands is much alike in both figures, and the 

 color of the fins is identical. 



On the other hand, there is nothing corresponding to tlie spots so 

 plainly indicated in Peale's sketch to be found in the drawing of P. 



* Revno ot Ma^. de ZooL, 2'"« s^fr., vni, 1^%, p. 54.^), pL 2.1 

 1,«378— Bn1l. 30 5 



