1906.] 



AN'ATOMY OF CENTROPHORUS CALCEUS. 



87] 



of any other Selachian which possesses these two features, viz. 

 the extremely long and slender duodenum and bile-duct. Other 



Text-fig-. 132. 



Centropliorus caJceus. 

 Transverse section tbrougli the duodenuur posteriorly. 



Text-fiff. 133. 



Centropliorus ccdceus. 



Transverse section across the bile-duct (A-B of PL LVII. fig. 3). 



A, artery ; B, lumen of bile-duct ; V, portal vein. 



Squalidse, as already remarked, possess an elongated duodenum ^-' ^'^ 

 and Lcemargus horealis^'' ^ ' {Somniosus microceplialus) a fairly slender 



12 "Die sogenannte Bursa Entiana der Selachier." H. C. Redeke. Anat. 

 Anzeig. xvii. 1900. 



13 " Ueber den Darm einiger Selachier." H. Helbing. Anat. Anzeig. xxii. 1903. 

 1* " A Contribution to the Visceral Anatomy of the Greenland Shark {Lceiiiargus 



borealis)." W. Turner. Jour. Anat. Physiol, vii. 1873. 



Proc. Zool. Soc— 1906, No. LYIIJ. 58 



