86 



THE WHALEBONE WHALES OF THE WESTERN NORTH ATLANTIC. 



"There is no neural spine on the second, third and fourth cervicals, and it is 

 rudimental and small on each of the remainder. Those of the dorsals and lumbars 

 are not particularly elevated. 



" The humerus is very short and thick, and the hand remarkably small. 



" The scapula, as in other Sibbaldii, has a considerable antero-posterior extent, 

 and well developed acromion and coracoid. The disk is divided into three areas 

 on the inside by two slight ridges." 



" The muzzle is elongate, and with a narrow acumination. Each nasal is as 

 wide as long medially ; anteriorly concave above, the line of junction of the two in 

 one plane, forming a median ridge, which is prolonged into a prominent median 

 point. The otic bullse are slightly compressed and carinate below, and their sur- 

 face is not markedly rugose. The malars are in shape something like first ribs ; 

 that is, with an enlarged head, with prominences imitating capitulum and tubercle, 

 a short narrowed shaft, and expanded distal extremity. The distal third is occu- 

 pied by an ovate ? articular surface, thinning out the margin on one side. The 

 shaft is thin and concave, both longitudinally and transversely, on one side. 



" The inner margin of the palatine bones is regularly continuous with the 

 short pterygoids, which are very short, and do not approach near the otic bullae ; 

 Rudolph! represents the latter as prolonged to beyond the extremity of the bulla. 

 The posterior plate of the vomer in S. tectirostris extends much further posteriorly 

 than Rudolphi represents for 8. laticeps, and though there is no doubt some varia- 

 tion in this respect in the same species, the difference here is considerable. In 

 8. laticeps it extends to a little behind the anterior margin of the bulla ; in S. 

 tectirostris to behind the posterior margin, concealing much of the basioccipital. 



"The mandibular ramus is strongly curved, and very convex externally, less 

 so internally. The vascular foramina are very large externally, and very much 

 reduced in size on the inner face. The coracoid process is strongly elevated, curved 

 outward, and acuminate. There is a distinct angular process below the condyle." 

 (83, 17-19.) 



I have verified the majority of Cope's measurements, and give them below in 

 the order in which they occur in the original, together with such differences as I 

 noted. For purposes of comparison I shall repeat some of them later in a different 

 order, with other measurements of my own taken in accordance with a particular 

 system. 



SIBBALDWS TECTIROSTRIS COPE. (TYPE.) 



1 Not re-measured by myself. 



1 Given in another place as 126 in. 



