24 CETACKA. 



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



By exchange with the lioyal Brussels Museum of 

 Natural History, 1886. 



The originals of the following series of casts (purcluised, 1883) were 

 obtained from the Antwerp Cray, and are preserved in the lioi/al 

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

 Beneden in the l Ann. Mus. It. Hist. Nat. Belt/.' vol. iv. pt. 2, 

 pis. i.-xvii., to which memoir the following references apply. 



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



M. 1258. 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 

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



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

 cervical vertebra? of a young individual ; pi. ix. fig. 6. 



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

 vertebras ; pi. x. figs. 1-4. 



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

 vertebras ; pi. x. fig. 5. 



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

 individual; pi. x. fig. 6. 



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

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



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

 of the same ; pi. xii. 



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



