48 CETACEA. 



M. 3520. Cast of the imperfect right tympanic. The original is 

 from the lied Crag of Eelixstowe, Suffolk, and is preserved 

 in the Museum of Practical Geolog}^, Jermyn Street ; it 

 agrees almost exactly with the last specimen, and is 

 noticed by the present writer in the ' Quart. Journ. Geol. 

 Soc' vol. xliii. p. 13. Made in the Museum, 1886. 



Geneeicallt undetermined Specimens. 



A. The following specimens prohahly belong to the 

 BalcBnopterine Section. 



a. From Australia. 



43997-8. Fragment of a mandibular ramus and the imperfect 

 centrum of a lumbar (?) vertebra ; from the Pleistocene (?) 

 of Mordillioc, Hobson's Bay, Yictoria. These specimens 

 indicate a species of medium size. Farchased, 1872. 



b. From North America. 



M. 3568. The centrum of the sixth cervical vertebra ; from Calvert 

 Cliffs, Maryland, U.S.A. This specimen agrees in size 

 with the corresponding vertebra of Balcenojjtera rostrata^ 

 but is relatively thicker. 



Bean Collection. Purchased, 1859. 



B. The subfamily of the following specimens, which are all from 

 the Bed Crag of Suffolk, is not determined. 



26482. Fragment of the hinder part of the cranium. 



Presented by Rev. Prof. Hensloiv, 1851. 



36437, 37728-9, 44113. Four fragments of the cranium. 



Purchased. 



M. 1614. Fragment of the cranium ; from Felixstowe. 



Presented by C. Westendarp, Fsq., 1884. 



33395. The proximal extremity of the left ulna. 



Layton Collection. Purchased, 1858. 



48472. Part of the proximal extremity of a radius. 



Presented by C. Falconer, Esq., 1867. 



43999. Head of an anterior rib. Purchased, 1872. 



