62 MAMMALIA. 



BAliENOPTEKA (PlESIOCETUs) GrOKOPI, K BENEDEN. 



To this species, which is said to be rather smaller than the last, 

 Mr. Lydekker (Quart. Journ. Geol. Soc, Vol. XLIII, p.. 12, 

 1887) refers an imperfect tympanic, from the Red Crag Nodule- 

 bed of Suffolk, in the British Museum (No. 39,016) and possibly 

 some vertebrje in the same collection. 



Prof. Van Beneden (Bull. Ac. Roy. Belg., Ser. 2, Vol. XXXIV., 

 p. 15, 1872) described a large part of a skeleton from the Antwerp 

 Crag under the name of Plesiocetus Goropii, but afterwards {ibid., 

 Vol. L., p. 15, 1880) and Ann. Mus. Roy. Hist. Nat. Belg., 

 Vol. VII., Part 3, p. 65, 1882) altered it to Balcenoptera muscu- 

 loides, and noticed specimens described by Prof. Capellini, from 

 the Pliocene Beds of Pizzo in Italy. 



BALiENOPTBRA BOREALINA, F. BENEDEN. 



This species, which is said to be of smaller size than B. Goropi, 

 was described by Prof. Van Beneden (Bull. Ac. Roy. Belg., Ser. 2, 

 Vol. L., p. 15, 1880, and Ann. Mus. Roy. Hist. Nat. Belg., 

 Vol. VII., Part 3, p. 71, 1882) from specimens obtained from the 

 Antwerp Crag, and Mr. Lydekker (Quart. Journ. Greol. Soc, 

 Vol. XLIII., p. 12, 1887) has recognised tympanies of the same 

 species, from the Red Crag Nodule-bed of Suffolk, in the Ipswich 

 Museum and in the British Museum (Cat. Foss. Mamm,, Part v., 

 p. 39, 1887). 



BAL^ffiNOPTEKA EMARGINATA, OWEN, 



Plate VI., Figs. 9a, b. 



The tympanies from the Red Crag, which Sir R. Owen (Proc. 

 Geol. Soc, Vol. IV., p. 283, 1843.— Quart. Journ. Geol. Soc, 

 Vol. I., p. 40, 1845.— Brit. Foss. Mamm., p. 533, 1846) named 

 BalcBTia eviarginata and B. gibbosa, Mr. Lydekker (Quart. Journ. 

 Geol. Soc, Vol. XLIII., p. 12, 1847, and Cat. Foss. Mamm. Brit. 

 Mus., Part v, p. 40, 1887) now refers to the genus Balcenoptera 

 and unites in one species B. emarginata ; and at the same time 

 expresses the opinion that the tympanies of B. rostratella from 

 the Antwerp Crag described by Prof. Van Beneden (Bull. Ac Roy. 

 Belg., Ser. 2., Vol. L., p. 16, 1880, and Ann. Mus. Roy. Hist. 

 Nat. Belg., Vol. VII., Part 3, p. 73, 1882) cannot be separated 

 from B. emarginata, and that the latter name, being the earliest, 

 must be used. 



Several tympanies from the Nodule-bed of the Red Crag of 

 Suffolk in the Museum of the Royal College of Surgeons (Nos. 

 2,822-25) and one in the British Museum (No. 39,016a) have 

 been identified as this species by Mr. Lydekker and there are 

 others in the Museum of Practical Geology. Balcenoptera 



