44 CETACEA. 



M. 3525. Tho imperfect right tympanic ; from the Antwerp Crag. 

 By exchange with the Royal Brussels 

 Museum of Natural History, 1886. 



30261 a. An imperfect left periotic probably belonging to this species 

 or to C. burtini; from the lied Crag of Woodbriclge, Suffolk. 

 This specimen agrees very closely with the periotic of the 

 latter species figured by Van Beneden, op. cit. pi. xxviii. 

 figs. 2-4 ; it is noticed by the present writer in the ' Quart. 

 Journ. Geol. Soc.' vol. xliii. p. 12. Purchased, 1855. 



36601. Part of a similar right periotic ; from Woodbridge. 



Purchased, 1855. 



27434 a. An imperfect left periotic, of rather smaller size ; from 

 Woodbridge. Purchased, 1851. 



The following specimens may probably be referred either 

 to the present species or to C. burtini. 



42996 C. The centrum of an early lumbar vertebra ; from the 

 Antwerp Crag. Purchased. 



43599. The centrum of an early caudal vertebra ; from the Antwerp 

 Crag. This specimen closely resembles the fourth caudal 

 of the present species figured by Van Beneden, op. cit. 

 pi. xix. fig. 5. Purchased. 



43599 a. The imperfect centrum of a caudal vertebra ; from the 

 Antwerp Crag. Purchased. 



46735. The centrum of the third (?) cervical vertebra ; from the 

 Red Crag of Woodbridge, Suffolk. This specimen corre- 

 sponds with the third cervical of the present species figured 

 bv Van Beneden, op. cit. pi. xviii. fig. 3. 



Purchased, 1875. 



Cetotherium burtini, Van Beneden l . 



Syn. Plesiocetus burtini, Van Beneden 2 . 

 Plesiocetopsis burtini, Brandt 3 . 



This species is rather smaller than C. dubium, its length being 



1 Bull. Ac. R. Belg. ser. 2, vol. rxxiv. p. 18 (1872). 



3 Ibid. vol. 1. p. 19 (1880). 



3 Mem. Ac. Imp. St. Petersbourg, vol. xx. p. 146 (1873). 



