6 ON THE CETACEAN LARYNX. 
eo rrrttt < 
Fig. 11. Larynx or Drtrninus DELPHIS (natural size). 
The thyroid cartilage is shown in outline only. 
The larynx in Orcella and Platanista is very interesting, in as much as it 
appears in these two genera to retain in the adult state the precise conditions here 
described in the foetus of other Delphinoidea. The descriptions given by Dr JoHNn 
AnpERSON™ have not been quoted by recent writers on the Cetacean larynx ; and Dr 
AnpERSON himself has not called attention to what seems to us the great morpho- 
logical importance of the facts described. The following is the account given of the 
arytenoid cartilages and the structures connected with them in Orcella :— 
“The body of the arytenoid cartilage of Orcella is a laterally compressed oval, with a sharp margin 
directed forwards and a rounded margin posteriorly, by the upper two-thirds of which it is articulated to 
* Zoological Results of Expeditions to Western Yunnan. 4to. London, 1878. 
pl. xxvill. 
pp. 387, 455, 
