1881.] 



ANATOMY OF THE ER1NACE1D^>. 



403 



Gymnura. 



. r>=(2a+2i+2r) 2^id+d) 8=(2e+2f+2q+2h) b={2i-ir2j+2/c) 



'• r.=(2«'+2i'+2c')' 2^{d'+d'yP'"' 8=(2?-f-2/'+2/+2A)' *"' 6=(2J'+2^'+2-t')' 



Urinaceus. 



(i=i2a+2b+2 o) 2={ d+d) 6= (2/+2<7 +2A) 6 = (2»+2y+2^) 



'• 4 = (2a'+26') ' '■• 2={d'+d'y P"^' 4 = (2/'+2^') ' '"" 6=(2J'+2/+2/f') 



Fig. 10. 



Skull of E. ei/roj'xpns^. 



Fig. II. 



SkuU of E. blanfordi\ 



' These drawings show how I'emarkably E. europaus differs iu the form and 

 relative size of its second and third upper incisors and first upper premolars 

 from the other species of the genus, whicli resemble one another very closely in 

 the form and relative size of tlieir teeth. 



