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Show of any other Selachian which possesses these two features, viz. the extremely long and slender duodenum and bile-duct. Other Text-fig. 132. 1 9 0 6 .] ANATOMY OF CENTROPHORUS CALCEUS. 871 Centrophorus calceus. Transverse section through the duodenum posteriorly. Text-fig. 133. B Centrophorus calceus. Transverse section across the bile-duct (A-1j of PI. LVII. fig. 3). A, artery; 13. lumen of bile-duct; V, portal vein. Squalidaj, as already remarked, possess an elongated duodenum12,13, n nd Lcemargus borealis11' 11 (Somniosus microcephalus) a fairly slender " 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. 14 " A Contribution to the Visceral Anatomy of the Greenland Shark (Lcemargus borealis)" \V. Turner. Jour. Anat. Physiol, vii. 1873. P r o c . Z o o l . Soc.- 1906, No. LVIIT. 58 |