THE WHALEBONE WHALES OF THE WESTEEN NORTH ATLANTIC. 



SIBBALDIUS TECTIEOSTRIS COPE. (TYPE.) (Contiiiued.) 



87 



Measurement. 



Transverse extent of centrum do. [3d cervical] 



Length parapophysis si.xth cervical 



Vertical diameter centrum (5th ?) dorsal 



Length centrum do 



Vertical diameter centrum second caudal, with perforate dia- 



pophyses 



Length of centrum do 



Height, spine and arch, middle lumbosacral 



" from floor canal to top anterior zygapophysis 



Scapula, antero-posterior width 



" vertical width 



Length of acromion 



" " coracoid 



Diameter of glenoid cavity 



Length of cranium (axial) 



Greatest width of occipitals 



Width at supraorbital plate 



" of each maxillary at middle 



" of supraorbitals above orbit 



" (least) of frontal region 



" of nasals 



" intermaxillaries at middle 



Length, nasal 



" maxillary above 



" ramus mandibuli (in curve) . 



" " " to coronoid 



Depth " " at condyle 



" " " at coronoid 



at middle 



Lengih, otic bulla 



Length of longest plates of whalebone with gum 



Width do. at base 



It is, I think, proper to assume that the type of S. tectimstris is nothing more 

 or less thau a specimen of the "common Finback" of the Atlantic coast of the 

 United States. Cope, at the time of original publication, was probably not in posses- 

 sion of the fact that the Finback wLich strands most frequently on our coast is of the 

 fashion of B.phymlus (L.). He considered his specimen most closely allied to Sib- 

 haldim laticeps of Gray {= B. horeaUs Lesson), but, as might be ex[>ected, he found 

 numerous differences. At a later date, in consequence of his own more extended 

 studies, and the progress of cetology, he perceived that tectirostris was properly to 

 be associated with, or might even be identical with, B. physalus. Cope also con- 

 sidered his S. tubero-vis allied to S. laticeps of Gray and for a time identified it with 

 the latter species. But at the same time he pointed out two external characters 

 by which he supposed it differed ivom tectirostris, — the form of the dorsal fin 



' Not re-measured by myself. ' Cope gives 120 in. on another page. 



' If the nasal process of the maxilla is taken into account ; otherwise, 9 in. 

 ' This is the greatest breadth ; the least is 8.75 in. , , , , , • , 



'This is the width at the distal end. Cope's measurement was probably taken at the proximal 

 end, for which it is correct. 



The coracoid is broken. 



