rKODELrin>,L".s lateralis. 



Table of measurentenis — Contiuned. 



65 



PRODELPHINUSC?) LATERALIS Pcale. 



Bdphiiius lateralis, Peale, Maiuiu. U. S. Expl. Esped., 1st cd., 1>M8, p. 35, PL 



VIII, fig. L 

 La(icnorUijnchHs lateralis, Cassin, Maumi. U. S. ExpL Exped., '2d ed., LS5'^, p. 32, 



PI. VII, fig. 1. 



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

 figure to the figure of J', marginatns giveu by Pucheraii.* The color of 

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

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

 natus without question. 



The general color of the upper surfaces of P. marginatus 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 

 former species were drawn some time after they were captured, while it 

 is probable that Peale's sketch was made immediately. Tlie general 

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

 color of the fins is identical. 



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

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



* Revno et Mag. de ZooL, 2'"« s6v., viii, 1856, p. 545, pi. 25. 



1S378— Bill!. ;in 5 



