by Mantell in the ' Medals of Creation,' vol. ii. p. 824, 

 and referred to Balcena mysticetus ^ ; but the occurrence 

 of the cervical vertebra No. M. 425 in the same bed 

 renders it more probable that it belongs to the present 

 species. Mantell Collection. Purchased, 1836. 



M. 434. Eragment of a rib ; from the Pleistocene of Brighton. 



EnnisMllen Collection. Purchased, 1882. 



33451. The imperfect centrum of a middle caudal vertebra ; from 



the Norfolk coast. Layton Collection. Purchased, 1858. 



33452. The imperfect centrum of a later caudal vertebra ; from the 



Norfolk coast. Layton Collection. Purchased, 1858. 



33462. An imperfect caudal vertebra ; dredged from the eastern 

 coast. Layton Collection. Purchased, 1858. 



33457. The rolled centrum of a caudal vertebra ; from the eastern 



coast. Layton Collection. Purchased, 1858. 



The foUoiuing specimen is larger than any of the preceding, and may 

 perhaps belong to B. musculus. 



46283. The centrum of a lumbar vertebra ; dredged in the North 

 Sea. Owles Collection. Purchased, 1874. 



Balsenoptera borealina, Yan Beneden ^ 



This species is smaller than B. goropi, and closely allied to the 

 existing B. horealis. 



Hah. Europe (Belgium and Eng]and). 



M. 3518. The imperfect right tympanic ; from the Antwerp Crag. 



This specimen agrees with the one figured by Van Beneden 



in the ' Ann. Mus. E. Hist. Nat. Belg.' vol. vii. pt. 3, 



pi. Ixviii. fig. 17. By exchange luith the Royal 



Brussels Museum of Natural History, 1886. 



M. 3522. Cast of the imperfect left tympanic. The original, which 

 is much water-worn, was obtained from the Red Crag of 

 Suffolk, and is preserved in the Ipswich Museum ; it agrees 

 precisely with the Belgian specimen, and is noticed by the 

 present writer in the ' Quart. Journ. Geol. Soc' vol. xhji. 

 p. 12. Made in the Museum, 1886. 



^ See Owen. Brit. Foss. Mamm. and Birds, p. 542. 

 2 Eull. Ac. R. Belg. ser. 2, vol. 1. p. 15 (1880). 



