NOTCHES AND FISSURES OF THE SPLEEN. 



425 



but in some species, such as the Iguana (fig. 7), there are many 

 notches, and each one corresponds to the point of entrance of a 

 vessel. 



The amphibia occasionally have notched spleens, as in the case 



Fi<;. 7.— Spleen of Iguana Lizard. 



of the giant salamander, but usually they are smooth. It is 

 only when we get down to the elasmobranch fish that we find 

 the spleen really lobulated, and it is curious how inconstant 



Fig. 8.— Spleen of Porbeagle ShaiK. 



this lobulation is ; for instance, in the basking shark (Selache) 

 (fig. 8) and the porl)eagle shark (Lamna) the organ is divided 

 into perhaps a hundred lobes, while in the dogfish (Scyllium) 



