24 - CETACEA. 



M. 3513. The imperfect left tympanic ; from tlie Antwerp Crag. 



By exchange with the Royal Brussels Museum of 

 Natural History, 1886. 



The originals of the following series of casts {purchased, 1883) were 

 obtained from the Antwerp Crag, and are 'preserved m the Royal 

 Museum of Natural History at Brussels ; they are figured by Van 

 Beaeden in the ^Ann. Mus. R. Hist. Nat. Belg.' vol. iv. pt. 2, 

 pis. i.-xvii., to tvhich memoir the following references ap>ply^ 



M. 1260. Cast of the left tympanic ; pi. iii. figs. 1-4. 



M, 1358. Cast of the right tympanic ; pi. iii. figs. 5-8. 



M. 1284. Cast of the left tympanic ; pi. iii. figs. 9-12. 



M, 1259. Cast of the right tympanic; pi. iii. figs. 13-16. 



M. 1257. Cast of the left tympanic ; pi. iii. figs. 17-20. 



M. 1256. Cast of the left tympanic; pi. iii. figs. 21-24. 



M. 1261. Cast of the right periotic ; pi. iii. figs. 24-27. 



M. 1327. Cast of a nasal; pi. ii. figs. 1-4. 



M. 1269. Cast of the atlas vertebra: pi. viii. figs. 1-3. 



M. 1328. Cast of one half of the atlas vertebra ; pi. xi. figs. 4, 5. 



M. 1276. Cast of one half of the atlas vertebra; pi. viii. figs. 4-6. 



M. 1266. Cast of the conjoint axis and the three following cervical 

 vertebrse ; pi. ix. figs. 1-3. 



M. 1278. Cast of the axis and portions of the three following 

 cervical vertebrae of a young individual; pi. ix. fig. 6. 



M. 1271. Cast of one half of the conjoint axis and five following 

 vertebra) ; pi. x. figs. 1-4. 



M. 1265. Cast of one half of the conjoint axis and five following 

 vertebra) ; pi. x. fig. 5. 



M. 1270. Cast of the atlas and six following vertebra) of a young 

 individual; pi. x. fig. G. 



M. 1268. Cast of a section of the last six cervical vertebrae of a 

 young individual ; pi. x. figs. 7, 8. 



M. 1264, 1267. Casts of the conjoint cervical vertebra) and section 

 of tlie same ; pi. xii. 



M. 1329-31. Three casts of cervical vertebrae. 



