BALtENID^. 



43 



rior in size to Bdloenojptera goropi ; the parietals are longer than in 

 G. duhium. 

 Hah. Europe (Belgium and England). 



M. 3527. The imperfect left tympanic ; from the Antwerp Crag. 



This specimen closely resembles the one figured by Van 



Beneden in the 'Ann. Mus. R. Hist. Nat. Belg.' vol. ix. 



pt. 4, pi. ii. fig. 1. By exchange luitJi the lioyal 



Brussels Museum of Natural History^ 1886. 



43600. The right humerus ; from the Antwerp Crag. This speci- 

 men resembles the one figured by Van Beneden, op. cit. 

 pi. iv. Purchased. 



46734. The centrum of the axis vertebra ; from the Eed Crag of 

 "Woodbridge, Suffolk. This specimen agrees very closely 

 with the one figured by Yan Beneden, op. cit. pi. vii. 

 fig. 4. Purchased, 1875. 



Cetothermm dubium, Yan Beneden \ 



Syn. Plesiocetus dubius, Yan Beneden ^. 

 Plesiocetupsis dubius, Brandt ^. 



This species is intermediate in size between C. hrialmonti and 

 C. hurtini, many of the bones being very difficult to distinguish from 

 those of the latter, and also resembling those of Megaptera similis. 

 The atlas and axis are less massive than in C. hurtini. Two worn 

 tympanies in the Museum of the Boyal College of Surgeons (jS"o. 

 2832 A, b) indicate the occurrence of the species in the Eed Crag. 



Hah. Europe (Belgium and England). 



M. 3526. The slightly imperfect left tympanic ; from the Antwerp 

 Crag. This specimen agrees precisely with the one figured 

 by Yan Beneden in the ' Ann. Mus. E. Hist. Nat. Belg.' 

 vol. ix. pt. 4, pi. xiv. fig. 14. 



By exchange luith tJie Koyal Brussels 

 Museum of Natural History, 1886. 



M. 3526 a. A rather more imperfect example of the left tympanic ; 

 from the Antwerp Crag. 



By exchange tuith the Royal Brussels 

 Museum of Natural History, 1886. 



1 Bull. Ac. E. Belg. ser. 2, vol. xxxiv. p. 18 (1872). 



2 Ibid. vol. 1. p. 18 (1880). 



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



