552 APPENDIX. 



There is a variety in some species of these ani- 

 mals, which is, I believe, peculiar to this order, 

 viz. the want of the sense of smelling ; none of 

 those which I have yet examined having that 

 sense, except the two kinds of Whalebone Whale: 

 such of course have neither the olfactory nerves 

 nor the organ : therefore in them the nostrils are 

 intended merely for respiration ; but others have 

 the organ placed in this passage as in other ani-^ 

 mals. 



The membranous portion of the posterior nos- 

 trils is one canal ; but when in the bony part, 

 in most of them, it is divided into two : the Sper- 

 maceti Whale however is an exception. In those 

 which have it divided, it is in some continued 

 double through the anterior soft parts, opening 

 by two orifices, as in the Piked Whale ; but in 

 others it unites again in the membranous part, 

 making externally only one orifice, as in the Por- 

 poise, Grampus, and Bottle-nose Whale, At its 

 beginning in the fauces, it is a roundish hole, 

 surrounded by a strong sphincter muscle, for 

 grasping the epiglottis : beyond this the canal be- 

 comes larger, and opens into the two passages in 

 the bones of the head. This part is very glandu- 

 lar, being full of follicles, whose ducts ramify in 

 the surrounding substance, which appears fatty 

 and muscular like the root of the tongue, and 

 these ramifications communicate with each other, 

 and contain a viscid slime. In the Spermaceti 

 Whale, which has a single canal, it is thrown a 



