80 



BULLETIN :;t;, UNITED .STATES NATIONAL MUSEUM. 



alls which Mr. Dall has kindly placed at my disposal. In the following 

 table are given both series of measiireinents, reduced to centimeters:* 



Measuienients. 



L. peronii. From 

 L(isson. 



Totnl lenjifh 



Ciicumferonco oppiisito the soiiitals 



CircumtVrence of tLe bead at thu eyes 



Length of the fail 



Leii;:! h froni extremity of snout to pcctoial 



Leiigtli fioni aiij:lo of mouth to eye 



Length from o.\ e to pectoral ,' 



Length of the pec-toral 



Length from extremity of snout to corner of miuitli. . 



Length of the tail* 



Length of the penis 



Length of tlio eye 



Length from anus to exti-emity of tail 



Length of the anus 



L. borealis. From 

 Mr. Ball's notes. 

 8160 rf. 200 miles 

 off Cape Mendo- 

 cino, Gal. 



*I uuder.stand this to be the antcro-postcrior length of either tlukc. The fourth measurement is 

 the width between the extremities of the flukes. 



It appears that Lesson's specimen was much stouter than the L. bore- 

 alls observed by Mr. Dall, and had wider flukes and longer pectoral fins 

 and mouth. Mr. Dall's sketch of his specimens shows these characters. 

 It represents a dolphin more slender thau even that tigured by D'Or- 

 bigiiy and Gervais; and while, in all the figures of the southern forms 

 the snout and pectoral fins at least are white, in Mr. Dall's figure the 

 black color extends to all parts of the body except an area on the belly 

 and a small space on the under side of the lower jaw. 



There is a painted skin of this species (No. G080) in the Zoological 

 Museum of Berlin. The beak and pectoral fins arc painted white, and 

 the same color extends upon the upper anterior margin of the flukes. 



That there are two distinct species of right-whale porpoises can not, 

 I think, be doubted. 



TURSIO BOREALIS (Peale). 



Delph'uiaptcrus honalin, Peale, U. S. Explor. Exped., Maiiim. Oriiitb., 1848, p. 35, PI. 



VIII, fig. 2. 

 Lcticorhamjyhus borealis, Dall, in Scaiuiuon's Marine Maniiu., 1874, p. S'JG. 



The general accuracy of Peale's figure of this animal is confirmed by 

 Mr, Dall's MS. notes upon, and figure of, a second specimen (already re- 

 ferred to) taken 200 miles off Cape Mendocino, California, a short dis- 

 tance south of the locality in which it; was first observed by Peale. Peale's 

 brief description applies to Mr. Dall's figure, except that in the latter 

 the lower jaw is represented as protruding beyond the upper and is 

 white at the extremity. In both figures the pectorals and flukes are 

 black aiul in both there is a lozenge shaped white area on the breast, 

 drawn out posteriorly into a line which extends to the flukes. In Mr. 



'For fuller measurements of L. horealin, see p. 81. 



