396 Development of the Skeleton of the Apteryx. [Feb. 23, 



Fig. 6. 



The anterior turbinal arises as a single somewhat oblique plate, 

 attached to the ali-ethmoid along its whole length : it soon divides 

 into two plates, each of which becomes rolled upon itself forwards, 

 forming two oblique scrolls. 



Finally, the anterior turbinal is coutinued forwards into the narrow 

 portion of the olfactory chamber (2nd and 3rd portions of lateral 

 ethmoid, see sections), as a horizontal plate, which, like the main 

 portion of the turbinal, divides into two : these are rolled upon them- 



