7.G BULLP:TIN 36, UNITED STATES NATIONAL MUSEUM. 



TIic (leyciiptiou j^iveu by Dr. Liitkeii * applie.s almost ofiually well to 

 a skeleton receutly collected by the naturalists of the U. iS. Fish Coui- 

 mission Steamer Albatross, iu the Pacific Ocean, between tlie Galapagfos 

 Islands and Panama. The vertebral formula in each is as follows: 



Dr. Liitken's specimen C. 7 ; D.14; L.17; Ca. 34=72 



U.S. Neat. Mus., No. 23302 C.7; D.14; L. 18; Ca.34 = 7:> 



The relations of the processes and foramina of the vertebrie are as 

 follows : 



Dr.Lutken'.s U. S. Nat. Mus., 

 speciuieu. No. :i33U2. 



First foraiucu perforaiis on vertebra number 48-49 48-49 



Last distinct transverse process on vertebra number. 55 .50 



Last neural spine on vertebra number 61 62 



Vertebne -without zygopophyses 11( = 31-41) 10(=r 32-41) 



The length of the pectoral fin in the specimen in the National Museum 

 is 25C™"'. The formula of the phalanges is as follows: I, 2; II, 9; III, 

 7; IV, 3; V, 0. 



The entire skin of this individual was not preserved, but the fins and 

 a piece of skin fvom the side of the body were received with the skele- 

 ton. From these it appears that the dolphin was dark slate-gray above 

 and white below. The darker color, which extends on to the fins, is 

 everywhere mottled with very small blotches of a lighter gray. The 

 white parts appear to have been covered with small streaks and stellate 

 blotches of gray. Measurements of the skull will be found in the fol- 

 lowing table. 



Table of measurements. 

 PRODELPHINUS LONGIROSTRIS. 



Oj). cii., pp. 47, 48. 



