PSEUDORCA CRASSIDENS. 



203 



Length of the head measured from the occipital condyles 

 to the tip of beak . . . . . 



Length of the head measured to the middle of the in- 

 ferior margin of the occipital foramen 



Length of the cranial portion measured from the occi- 

 pital condyles to the posterior wall of the nasal 

 canal ...... 



Length of the beak measured from its origin on a 

 level with the anterior extremities of the zygomatic 

 bones ...... 



Greatest breadth of the head (across the zygomatic pro- 

 cesses of the temporal bones) 



Breadth of the head across the postorbital processes of 

 the frontals ..... 



Breadth across the occipital ridge at its union with the 

 temporal ridges ..... 



Breadth across the prominences formed by the fron- 

 tals, the superior maxillaries and the zygomatic bones 

 in front of the orbit .... 



Breadth of the beak at its origin 



Breadth of the beak towards the middle, just before the 

 most posterior tooth but two 



Height of the occipital foramen 



Breadth » » ... 



Distance from the inferior margin of the occipital 

 foramen to the posterior margin of the pterygoid 

 bones ...... 



Length of the dental row in the upper jaw 



Length of the lower jaw measured from the condyle to 

 its foremost extremity .... 



Length of the symphysis .... 



Length of the dental row in the lower jaw 



The specimen 



from Asnæs 



(?)• 



The specimen 

 from Refsnæs. 



The specimen 



from Middel- 



fart(^). 



Owen's fossil 

 Phoccena 

 crassidens. 







24" 





24" 



25" %'" 



— 



23" 



2"' 



23" 2"' 



— 



— 



8" 



9"' 



8" 6"' 



— 



10" 8'" 



11" 





11" 



11" 7'" 



14" 8"' 



14" 



10"' 



14" V" 



— 



— 



14" 



3"' 



14" 4"' 



14" 6"' 



8" 8'" 



9" 





8" 3"' 



— 





13" 





12" 8"' 





8" 3'" 



8" 



3"' 



8" V" 



— 



8" V" 



7" 



9"' 



1" 6"' 



_ 



— 



2" 



3"' 



2" 8"' 



— 



— 



2" 



2"' 



2" 6"' 



— 





8" 



2"' 



8" 





9" 8"' 



10" 



2"' 



9" 9"' 



— 



18" 6"' 



19" 



6"' 



18" 4"' 



19" 2i"' 



3" 



4" 





3" V" 



— 



9" 1"' 



10" 



2"' 



9" 5"' 



9" 2"' 



When compared with the greater majority of the other Cetaceans belonging to the 

 dolphin family, the dolphins to which the one treated of here is most closely alUed are all 

 provided with rather a small number of vertebræ. The Grampus griseus, one of the forms 

 in question having the greatest number, is stated by Cuvier^ to have only sixty-one. In three 

 skeletons of ca'ing-whales from the Faroe Islands, I find the number of the vertebræ to 



naturalists ; the discrepancies may perhaps be partly explained by the mutilated state of the skull, 

 which may have rendered it difiBcult to give some measurements otherwise than approximatively ; but, 

 at all events, they show that we must not overrate the small differences found in some dimensions of 

 Owen's cranium, when compared with those of the Danish crania. I may add in this place, that 

 the reason why I have given fewer measurements of the cranium of the Asnæs dolphin than of the 

 two other crania from Refsnæs and Middelfart, is the mutilated condition of the former. 

 ^ ' Rech. s. 1. Oss. Foss.,' 4me ed., t. 8, 2me partie, p. 147. 



