80 THE -WHALEBONE WHALES OF THE WESTERN NORTH ATLANTIC. 



Skull : Indus 



Length of mandible, straight 92.0 



" " " curved , 101.5 



Depth of mandible at the middle 7.0 



Skeleton : 



Greatest breadth of atlas 18.25 



" " ist lumbar 26.25 



Height of ist lumbar, measured posteriorly 16.00 



Depth of centrum of ist lumbar 7.0 



Greatest breadth of ist caudal 22.0 ' 



Height of ist caudal, measured posteriorly, and including process for chevron 19.5 



Depth of centrum of ist caudal 8.75 ' 



Breadth of scapula 30.0 



Depth of scapula 23.0 



Length of radius, with epiphyses 15.0 



without 14.0 



"ulna with " 135 



without 13.0 



Breadth of radius at distal end 10.5 



"ulna " " " 8.0 



Length of humerus, straight 14.0 



The first vertebra with a perforated diapophysis is the 38th. The neural 

 spine disappears on the 45th vertebra. The diapophyses are reduced to a 

 mere swelling on the 41st vertebra; as distinct pi'ocesses with concave anterior 

 margins, the last are on the 37th vertebra. 



Genus RHACHIANECTES Cope. 1869. 

 2. Agapheltjs glaucus Cope. 1868. 



"The California Gray Whale." 

 Rhacldanectes glaucus (Cope). 1869. 



Original description : Proceedings, Academy of Natural Sciences, Phila., 1868, 

 No. 3, June-Aug., p. 159. Read June 23, 1868. 



Type-locality : Coast of California. 



Type-specimen: " A full set of baleen of one side of the maxillary" in the 

 mnsemn of Essex Institute, Salem, Mass. 



Cope's original description of the California Gray whale was appended to 

 a notice of the mythical "Scrag whale," for both of which he established the genus 

 Agaplielm. The description is so brief that it may be inserted here in full : 



"A second species of the genus \^Agapkelus\ was to be found in the 'gray 

 whale' of the coasts of California. The baleen of this species, compared with that 



' Twice one half. 



''Anterior. Height of arch and spine of ist lumbar, gi in ; of ist caudal, 9I in. 



