NO. 8 INTERRELATIONSHIPS OF THE CETACEA WINGE 69 



Racovitza: Cetaces ; Expedition Antarctique Beige; Resultats dii 

 Voyage du S. Y. Belgica en 1897-99, Rapports Scientifiques, 

 Zoologie, 1903, pp. I -142, pis. 1-4. Contains much information 

 on the external characters and the habits of cetaceans, especially 

 whalebone whales, and gives numerous references to earlier 

 papers on the subject. 

 True : The whalebone whales of the Western North Atlantic com- 

 pared with those occurring in European Waters with some 

 observations on the species of the North Pacific; Smithsonian 

 Contributions to Knowledge, vol. 33, 1904, pp. 1-332, pis. 1-50. 

 Deals with species of the genera Balccna, Rhachionectes, Balcen- 

 optcra, Megaptera. Numerous illustrations, especially of skulls 

 and exterior. Copious references to earlier works on the subject. 

 Turner: The Right-Whale of the North Atlantic, Balsena biscay- 

 ensis : its skeleton described and compared with that of the Green- 

 land Right-Whale; Transact. Roy. Soc. Edinburgh, vol. 48, 

 191 3, pp. 889-922, pis. 1-3, with text figures. 

 Abel: Die Vorfahren der Bartenwale; Denkschriften der k. Akad. 

 der Wissensch. Wien, Mathem. naturw. Kl, vol. 90, 1914, pp. 

 155-224, pis. 1-12. Patriocetus, Agriocctiis. Review of the 

 origin of the whalebone whales. 

 Roy C. Andrews : Monographs of the Pacific Cetacea, I, The Cali- 

 fornia Gray Whale (Rhachianectes glaucus) ; Mem. Amer. Mus. 

 Nat. Hist., n. s., vol. i, pt. 5, 1914, PP- 227-287, pis. 19-28, with 

 figures of the exterior and of all parts of the skeleton. 

 Roy C. Andrews: The Sei Whale (Balsenoptera boreahs) ; Mem. 

 Amer. Mus. Nat. Hist., n. s., vol. i, pt. 6, 1916, pp. 289-388, pis. 

 29-42, with figures of the exterior and of all parts of the skeleton. 

 G. M. Allen: The Whalebone Whales of New England; Mem. 

 Boston Soc. Nat. Hist., vol. 8, No. 2, 1916, pp. 105-322, pis. 8-16, 

 with figures mostly of the exterior. Balcena, Balccnoptera, 

 Megaptera. 

 Besides Plesiocetus and Cctothcrium many other genera of fossil 

 Balsenids have been described, especially in papers by Van Beneden, 

 Brandt and Cope, but the bases for most of them are scanty. H. Winge 

 (Om Plesiocetus og Sqvalodon fra Danmark, Vidensk, Medd. Natur- 

 hist. Foren. 1909) has attempted to estimate the value of a number of 

 the genera in question : Aulocetus, Mesoteras, Cctothcriopsis, Mcgap- 

 teropsis, " Burtinopsis," Herpetocetus, Eucetotherium, Plesiocctopsis, 

 Cetotheriophanes, Cctotheriomorphus, Idiocetus, Heterocetus, Amphi- 

 cetus, Mcsocetus, Isocctus, Pachycetus, Siphonocctus, Ulias, Tre- 



