BY H. H. SCOTT AND t'LIVK K. Loi;I>. 7 



well as being an cxtremelv valuable IMuscuni exhibit. (See 

 Plate No. I.) 



PSEUDORCA CRASSIDEXS. 



General osteological notes upon the Tasmanian skele- 

 ton, and a comparative table cf measurements of the larg- 

 est, lumbar vertebrje of that skeleton, with Reinhardts 

 male from Middlefart. 



The skull in a wide sense is that of a small "OraJ' and 

 Ihe teeth conform to the O/w/ type, in having recurved 

 crowns, but of course are much smaller, as indicated bv the 

 following comparison with a true Orcn's teeth, measured 

 directly for this special purpose. 



i'sr,ri)(tu( .\. nui \. 



Indies I iiiclie 



(Oi Total lengtU of the largest tooth in the j 



upper jaw ... ... .. ... ... ... 1 ' 2 



(iirtli of same ... ... ... ... ... ... '.Vi, S,' 



('••) Len<j;tli of lart;est toolli in the lower jaw ... li '2\ 



Girtii of .-^ame . ... :ii 4 



The parietal, and squamosal moieties of the fcssje tem- 

 poralis in the Pstiiilorrn are C|uite unlike those of Orra, 

 being compounded in the following way. The squamosal 

 contributes a narrow practically, even strip, about 2 inches 

 wide, set at an angle, and continued to near the vertex. 

 In the Orra the squamosal is wide, and irregular, and takes 

 a lai'ger share in the fonnation of the fossa (upon either 

 side). One Orra skull, however, in the Museum collection, 

 makes a nearer approach to I'smdorra in this respect. Tho 

 parietal wings of I'anuhtrra are bent backwards at a slight 

 angle, to the line of the skull, exactly as in Tur>i'>itpx, 

 while in the Orra, the whole boundary walls of these fossje 

 bend outwards, as continuous outgrowths of the occiput. 



In the skeleton it may be noted that five of the cer- 

 vical vertebrae are strongly ankyloscd together, and two are 

 quite free. 



A mctapophysis appeal's — faintly indicated — upon 

 the second dorsal, and well marked one upon the fourth. 

 The seventh doi-sal develops these processes at the upper 

 level of the neural arch, in other words at the base of the 

 neural spine. Unlike the 5;ma\lcr dolphins, these processes 

 are not eliminated from the v?rtebra; in the region of the 

 dorsal fin, but continue to gradually decrease aftor the 



(9) This is ex-alveolar, enamel surface measurement. 



