5. LAGENORIITNCnUS. 271 



which were in the inteiinaxillary, and in the lower jaw there were 

 four or five hidden (sec Poehnan, IJull. Acad. Hoy. 15elg. xA-ii. 608, t.). 

 Length 237 millim. Black, lower part of the beak and the body 

 to the reproductive organs shining white ; a white band forms a 

 line under the dorsal to the base of the tail ; above yellow, beneath 

 Avhite. 



5. Lagenorhynchus clanculus. 



Skull wide and rather high behind. Beak flat ; outline wide at 

 the base, rapidly tapering and acute in front, but rather convex on 

 the sides, these being slightly rounded ; the hinder edge near the notch 

 only slightly turned up and rounded. Triangle to near the middle 

 of the beak. Lower jaw high behind. Teeth ^, small, cylindrical, 

 curved, rather acute at the tip ; the lower front one veiy small. In- 

 termaxillaries broad, hard. 



Lagenorhynchus clanculus, Grat/, Froc. Zool. Soc. 1849, 2 ; Ann. S)- 

 Mm/. N. H. 1849, v. 48 ; ZooLErehus S, Terror, t. 35, ined. (skull) ; 

 Cat. Cetac. B. 31. 1850, 102. 



a. Skull. Pacific Ocean. From Dr. Dickie's Collection. 



Length, entire l-ij inches. 



Length of beak 7^ „ 



Length of skull 7| „ 



Length of teeth-line 6^ „ 



Length of lower jaw 11| ,, 



Length of sj'mphysis, lower jaw Ij „ 



"Width at notch 4^ „ 



Width at orbit 7|- „ 



Width at middle of beak 2^ ,, 



Width of intermaxillary in middle .... Ij ,, 



Width of condyles above 2| ,, 



Very peculiar for the elongation and reflexion of the beak before 

 the notch, and the regular bevelling of the sides of the beak. 



6. Lagenorhynchus breviceps. 

 Blackish ; luider part white ; pectoral fin dusky. 



Delphinus breviceps, Pitcheran, Voij. Dinnont (VUrviUc, t. 22. f. 1. r. -^ o f- . L 



Beak verj- short ; snout produced. Beak of skuU depressed, only 

 slightly longer than the length of the brain-ca\-ity. Teeth ^-^- 

 Inhab. Rio de la Plata. 



7. Lagenorhynchus Thicolea. 



SkuU rather narrow behind. Beak elongate, about one-fifth longer 

 than the length of the head, rather dilated and concave above be- 

 hind, with the side edges in front of the notch elongate, keeled, and 

 turned up ; the middle of the beak flat, with flat shelving sides, the 

 shcl\-ing part being broader and forming a slight keel in front. In- 

 termaxillaries flat, gradually tapering. Triangle to near middle of 



hi ^^^- 



