148 



APTORNIS DEFOSSOR OWEN. 



Aptomis defossor Owen, Trans. Zool. Soc. VII, pp. 353 to 366, pis. 40-44 (1871). 



THE skull differs from that of A. otidiformis by the vertical surface of 

 the descending part of the occiput being less deeply concave, the 

 occipital foramen relatively smaller. The hind part of the base of the 

 alisphenoid is more produced and tuberous outside the end of the hyoid 

 process of the paroccipital in A. defossor. 



The chief other differences in size, according to Owen, are as 

 follows : — 



<iKULL. 



Length 



A. defossor. 



7*2 inches. 



A. otidiformis. 

 6 - 2 inches. 



Breadth across paroccipitals .... 



33 



, , .... 



2-9 



Breadth across postfrontals 



32 





2-10 „ 



Breadth across temporal fossae 



23 



, , .... 



H 



Breadth of base of upper mandible .... 



1-6 



,, .... 



1-3 



Breadth of middle of upper mandible .... 



1-4 



,, .... 



11 



Breadth of fore end of upper mandible 



07 



,, .... 



0-6 



Length of premaxillary .... 



50 



,, .... 



4-3 



Femur. 



Length 



7-6 



,, .... 



6-2 



Breadth of proximal end 



2-2 



11 "" 



1-9 



Breadth of distal end 



22 



,, .... 



1-9 



Circumference of middle of shaft 



2-9 



,, .... 



23 



Tibia. 



Length 



103 



,, — 



8-9 



Breadth of proximal end 



23 



,, .... 



1-9 



Breadth of distal end 



MO 



,, .... 



1.3 



Circumference of middle of shaft 



26 



,, .... 



111 „ 



Metatarsus. 



Length 



4.4 



,, .... 



310 „ 



Breadth of proximal end 



1-8 



,, .... 



1-5 



Breadth of distal end .... 



1-9 



,, .... 



1-6 



Breadth of middle of shaft 



1-6 



,, .... 



1*4 



Locality of type: Oamaru. 









Habitat : South Island. 









A nearly perfect skeleton in the 



Tring 



Museum, 



collected by 



W. S. Mitchel in limestone cave on Oreti River, 



Southland. 





