80 



BULLETIN 36, UNITED STATES NATIONAL MUSEUM. 



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

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



Mcasureinents. 



Totiil lenglh 



Circ.uiiifereiico opposite the genitals 



CircunitVrpiice ot the head at the eyes 



Leiifith of the tail 



Leuulh fioiii extremity of snout to pectoial 



Leiijtli from aii.iile of nioutli to eye 



Leiifi'h iron) eye to pector.il .....' 



Length of tlie pectoral 



J.eiijith from extremity of snout to corner of mouth 



Leiistli of the tail* 



Leiigt h of the penis 



Lengt h of the eye 



Length from anus to exlreraity of tail 



Leu"tli of the anus 



L. peronii. From 

 Lesson. 



L. boreal is. From 

 Mr. Dall's notes. 

 SlGOcf. 200 miles 

 off Cape Mendo- 

 cino, CaL 



Centimeters. 



18-i. 1 

 04.9 

 73.1 

 43.3 

 59.5 



5.4 

 2.1.7 

 3L1 

 27.1 

 14.9 

 21.7 



2.7 

 44.7 



1.8 



Centimeters. 



240. 4 

 5X3 

 57.2 

 40.6 

 63.5 

 9.5 

 30.5 

 30.5 

 24.8 



57.2 



* I understand this to bo the antcro-postcrior length of cither fluke. The fourth measurement is 

 the width between the extremities of the flukes. 



It appears that Lesson's specimen was much stouter than theX. horc- 

 «//.s' observed by Mr. Dall, and had wider flukes and longer pectoral tins 

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

 It represents a dolphin more slender than even that flgured by D'Or- 

 bigny and Gervais; and while, in all the tigures 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. G08G) in the Zoological 

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

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



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

 I think, be doubted. 



TUESIO BOREALIS (Peale). 



Delpliinnpterushorcalis, Peale, U. S. Exjilor. Exped., Mamm. Oruitb., 1848, p. 35, PI. 



VIII, fig. 2. 

 Lcucorliamphus borealis, Dall, in Scammon's Marine Manini., 1874, p. 29G. 



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- 

 taucesouth of thelocality 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 i)rotriiding beyond the upper and is 

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

 black and in both there is a lozenge .shai)ed white area on the breast, 

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



"For fuller measuretueuts of L. ItorcaJ'iH, sec p. 81. 



