Fishes of the Western North Atlantic 



6i 



reference. The extensive collections of the United States National Museum have also been 

 made available to us, as well as specimens from the Academy of Natural Sciences at Phila- 

 delphia, the American Museum of Natural History, the Bingham Oceanographic Collec- 

 tion at Yale University, the Carnegie Museum at Pittsburgh, the Chicago Natural History 

 Museum, the California Academy of Sciences, the Museu Nacional in Rio de Janeiro and 

 the Woods Hole Oceanographic Institution. Other specimens and data are acknowledged 

 on page 59. We regret that war conditions have prevented us from examining the types 

 of many species of sharks that are in the British and European museums.*^ 



Proportional Dimensions and Illustrations. The actual measurements from which 

 the proportional dimensions of the several species have been calculated were taken on 

 a horizontal line between perpendiculars at given points; for example, the distance from 

 tip of snout to origin of first dorsal fin is the line BC in the accompanying illustration (Fig. 

 6), not AC; the length of snout in front of nostril is line ED, not DF. The illustrations 

 have been drawn on this basis so that the proportions can be scaled from them directly, if 



Lowtr 

 Caudal 

 lota 



Figure 6. Outlines of a typical shark to illustrate terminology and methods of measurement. 



desired. In the shark illustrations, the dermal denticles pictured are from high on the sides 

 of the trunk, below the first dorsal fin, unless otherwise noted. All the illustrations are 

 original, except as indicated; the great majority were prepared by the well known zoologi- 

 cal artist E. N. Fischer. Rhincodon was drawn by Janet Roemhild, Pseudotriakis by A. 

 Fraser-Brunner and Echinorhinus by Lieut. Colonel W. P. C. Tenison. 



la. For a list of type specimens of cyclostomes, elasmobranchs and chimaeroids in the Paris Museum, see Bertin 

 (Bull. Mus. Hist, nat., Paris, [2] //, 1939: 65-93)- 



