12 



INTRODUCTION. 



§ 2. Measurements. 



At the begiuuing of my studies in the European museums I adopted 

 a series of measurements which I applied uniformly to all specimens. 

 It was not long before I perceived, however, that certain of them were 

 of less value than others in the discrimination of species. I include 

 them all in the tables in the hope that they may have value in some 

 other connection. 



The measurements are given uniformly in centimeters. The total 

 length of the skull is measured from the center of a line joining the 

 surfaces of the occipital condyles to the extremity of the rostrum. The 

 length of the rostrum is obtained by measuring from the extremity of 

 the same to the center of a Hue joining the bases of the maxillary 

 notches. The orbital breadth is the distance between the centers 

 (autero-posteriorly) of the margins of the orbits. The temporal fossie 

 being in most cases elliptical, the measurements of their length and 

 breadth are made along their major and minor axes. 



§ 3. Abbreviations. 



There are a number of works upon the DelpUnidm to which I shall have 

 need to refer so frequently in the succeeding images that I have adopted 



for convenience certain abbreviations of their titles. These works are 



* 



as follows: 



Title. 



Abbreviation. 



J. R. Gray. Cafalogno of Seals and Whales in the British Museum. 2d 



cd., London, 8^, IHGG. 

 J. E (jKAY. S.vuo])sis of the Species of Whales and Dolphins in the Col- 



Irction of the British Museum. London, 4=", 1868. 

 J. K. Gray. Snjiplement to the Catalogue of Seals and W^hales in the 



liiilisli Museum. London, 8°, 1871. 

 Wm. H. Floweic. On the Characters and Divisions of the Faniilv Del- 



/iliiniiln'. Proi'ecdings, Zoolosical Society of London, iHSli, pp. 406-513. 

 W.M. H. Flovvkk. Li.st of the Specimens of Cetacea in the Zoological De- 



>>arliuent of the British Aluseura. London, 8°, 1885. 

 Sen r,E(;EL. Ahhandlungen aus dem Gebiete der Zoologie und vergleichen- 



dcii Amitomie. Leiden, 4^^, 1811. 

 Van- Benede.v et Gervais. Osteographie des Cetaces vivant et fossiles. 



I'aris, 4°, 1880. 

 P. FisciiKK. Cetaces du Sud-Ouest de la France. Actes de la Societe 



Liuncenue de Bordeaux, xxxv, 1881, pp. 5-219, pi. i-viii. 



Catalogue. 



Synoiisis. 



Supplement. 



Characters and Divisions. 



List. 



Abhandlungen. 



Osteographie. 



Cetaces de France. 



