14 



PLEI STOCEN 1<: M AMM ALI A . 



(8) Meastjeements op the Deciduous Teeth (cnntinned). 





LOWEE. 



Teeth in jnw fi-om Kent's Hole, Tor- 

 quay, figured in PI. Ill, fig. 4 iBrit. 

 Mus. No. 1743). 



Teeth in jaw from Kirkdale Cave 

 (Brit. Mus. No. 36). 



..^. 



dm. 3. 



d.m. 4. 



21 



0-7 



... 



d.m. 2. 



d.m. 3. 



d.m. 4. 



Maximum antero-posterior measurement ... 



Maximum transverse mcasixrcnient of crown 



Measiirement from notch between roots to 

 top of crown 



1-0.5 

 0-05 



0-Co 



1-45 



0-75 



0-8 



10.5 1-5 

 0-55 07 



205 

 0G5 



c. The Vertebral Column (Pis. VJ, VII, VIII). 



(1) Disiinctive Feait(resof the Verichral Cohniifiof iJie Gams Bycena. — 'Ilicic are not 

 many distinguishing features cliaracterising tlie vertebral column in Thjana as compared 

 with that in other Carnivora, Twenty is the regular number of thoraco-himbar vertebra) 

 in the great majority of Carnivora, but the relative proportion of thoracic to lumbar 

 varies from thirteen thoracic and seven lumbar in Felis, Canis, and Viverra, to sixteen 

 thoracic and four lumbar in Arctomjx collaris. In Hyana there are fifteen thoracic to 

 five lumbar vertebrae. 



The small size of the thoracic vertebral ecu Ira, and the rapid decrease in the length of 

 the neural spines when followed back, arc features characterising Hyccna, The first 

 sacral vertebra is a good deal larger than the others, causing the sides of the pelvis to 

 converge posteriorly as in Ursiis, instead of being approximately parallel as in Canis. 



(2) Disihiciive Features of the Vertebral Column in the Different Sjjecies of Living 

 JFi/ana. — There seems to be no marked difference between the vertebi-al columns of 

 H. crocuta and //. striata, except that in //. crocuta the sacrum includes four vertebrae, 

 while in H. striata there are three. There are only eighteen caudal vertebrae in 

 //. crocuta, as compared with twenty-three in R. striata. Most of the vertebiae are 

 more massive in 11. crocuta than in //. striata, and the size of the vertebrae when 

 followed back decreases somewhat more ra})idly in the former than in the latter species. 



