( 55 ) 

 . XXXV. 



Labyrinthus osfeus. 



Mammalia. In mammalibus os petrofum la- 

 minis osfeis, labyrinchum membronaceum tegen 

 tibus, adeo adhaerec , uc in animal! adulto, vix 

 ab illis discingui posflc (17} ^ n ornichorhyn- 

 cho hyscrice, loco cochlae verae cantum cornu 

 arcuatum invenitur (i), Cetacea vescibulum ec 

 cximiam cochleam posfident. (2). In del* 

 phino, pars osfea laminae fpiralis, infra eius 

 bafia et fcaJam tympani, canalem demon- 

 ftrat, qui ab una cochleae extremicate, ad 

 alteram cendit, et verifimilicer ad condnendum 

 nervum vel vas fanguiferurn infervic ; qualis eti- 

 am, fed racione habica minor, in ruminancibus 



ob 



(1) Horns Phil. Transact. 1802 p. 355". 55 the im* 

 perfect cochlea confists of a conical cavity , a little 

 bent in the. middle of which there i a double cartila- 

 ginous feptum." 



(2) cF. Mem. pres a Facad. roy. des fc. a Paris 

 Tom. VI. p. 178. de Verhand. dcr Haarl. Maatjch. 

 IX. D. $.ft. p. 193 et X/ 7 //. D. 2 ft. in qua ultim a 

 Disfertat. Tab. II. fig. 2 et 3. et cochlea Tab. II. 

 j%. i.aere infculpta videri posfunt. 



