MESOPLODON — BERARDIUS. 93 



in Museum of University of Oxford. See Turner in 

 Cltallenger Reports, vol. i., 1880. 



Donor — Oxford Museum. 



4. Tooth, right mandibular, removed from the mandible of 



the young skull from East Falkland Island. A section 

 was made, from which slides for microscopic examina- 

 tion were obtained. See Turner in Challenger 

 Reports, vol. i., 1880. Challenger Collection. 



5. Tympano-periotic bones, right, from the young skull 



from East Falkland Island, No. 1 ; stapes in place. 

 Tympanic, length If inch, breadth 1^ inch, height 

 I inch. Outer surface flattened behind, moderately 

 convex in front, unequally divided by an almost 

 vertical groove, from which to the anterior border 

 is 1^ inch, to posterior border I inch ; lip-like process 

 prolonged down outer surface. Inner surface moder- 

 ately striated, vertical diameter f inch behind 

 diminishing towards Eustachian end. Inferior aspect 

 bilobed posteriorly, outer lobe smooth and rounded, 

 larger than the rough and laterally compressed inner ; 

 the lobes are separated by a groove which widens out 

 anteriorly to f inch as a shallow roughened fossa, 

 so that this aspect deserves the name of inferior 

 surface; the cavity opens by a wide mouth at its 

 anterior end. 



Compared with the tympanic of Sowerby's Whale, 

 the outer lobe is smoother and more rounded, and the 

 groove separating it from the inner is wider, but it 

 does not extend so far forwards, and the inner surface 

 turns more abruptly from the inferior surface. 



The Periotic is lj% inch long, l^^o i^^h broad; 

 the meatus internus is a single canal. See Turner 

 in Challenger Reports, vol. i., 1880. 



Challenger Collection. 



VI. BERARDIUS. (Br.) 



Length about 30 feet. Two compressed pointed teeth 



on each side of mandibular symphysis. Beak long 



and narrow, medio-rostral partially ossified. Only 



one species from the New Zealand seas is recognised. 



Bei-ardius arnuxi, Duvernoy, Ann. Sci. Nat., 1851. 



No specimen in Museum. 



