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Show 1906.] ANATOMY OF CENTROPHORUS CALCEUS. 8 8 5 Fig. 3. The alimentary tract and associated glands. A, B, C, D, E, parts of pancreas; B.I)., bile-duct with arteries and veins; C.A., cueliac artery; CAR., cardiac portion of stomach; DUO., duodenum ; H.V., hepatic vein ; L.M., lieno-mesenteric artery; P Y., pyloric portion of stomach; S. 1, large spleen; S. 2, small spleen; S.V.I., spiral-valve intestine; V ., ventricle; VE., vein running from middle lobe of pancreas to bile-duct. (For other letters, see text.) 3 a. Pancreas viewed from other side. Pl a t e L V I 1 I . Centropliorus calceus. Fig. 4. The afferent arches. The ventricle has been turned forward somewhat to expose the sinus venosus. D.C., opening of the Cuvierian duct into the sinus venosus; H., opening of hepatic vein into sinus venosus; L.F., labial folds; S., subclavian vein ; S.A., sinu-auricular aperture. 5. The efferent arches. C.C., common carotid; E.C., external carotid; I.C., internal carotid ; S., spiracular cleft. 6. Suspensorial apparatus of jaws. CH., cerato-hyal; H.Y., hyomandibular; L.C., three labial cartilages of right side; L.J., lower jaw; L.P., large process in connection with upper jaw (well seen in tig. 16, P .) ; L. 1 , ligament connecting hyomandibular to upper jaw; L. 2, large ligament connecting hyomandibular to lower jaw ; L. 3, ligament connecting upper and lower jaws; M., muscle in connection with two upper labial cartilages; P.C., three pre-spiracular cartilages in anterior wall of spiracular cleft; S.C., spiracular cleft. 7. Trunk-vertebrte in intra- and inter-vertebral section and in side-view. E.L., elastic ligament. 8. Anterior caudal vertebra in intra-vertebral section. A.M., attached muscle; A.P.N., aperture for spinal nerve; C., calcified region; C.A., caudal arteiy ; C.Y., caudal vein; E.L., elastic ligament. P l a t e L IX . Centropliorus calceus. Fig. 9. Skeleton of the anterior dorsal fin. 10. Skeleton of the posterior dorsal and caudal tins. 11. Dorsal aspect of the skeleton of the right pectoral fin. B., basal cartilage; C., ceratotrichia attached to bases of D .R .; C.P., articular process of pectoral girdle; D.R., distal radialia; P.R., proximal radialia. 12. Ventral view of the skeleton of the right pelvic fin. B., basal cartilage ; P.P., articular process of pelvic girdle. P l a t e LX. Centropliorus calceus. Fig. 13. The urinary system. C.U., common ureter; D.A., dorsal aorta; J.U., junction of ureters; K., kidney ; K.A., anterior extremity of kidney; K.D., kidney-duct; M., myotonies cut across; P.C.S., position of the posterior cardinal sinus (peritoneum removed); S.D., ducts opening into ureter from kidney; U.O., ureter opening on urinary papilla (bisected) in cloacal cavity. 14. Dissection of the 9th and 10th cranial, occipito-spinal, and brachio-spinal nerves. B.P., brachial plexus; D.B.X., small branches from L.L.B.X. supplying dorsal muscles; L.L.B.X., lateral-line branch of vagus; M.L.J., branches of occipito-spinal nerves to muscles of lower jaw; S.C., spiracular cleft; V.B.X., visceral branch of vagus. 15. Dissection of the brain and cranial nerves viewed from the dorsal surface. A.V., aquseductus vestibuli of ear; A.Y.C., anterior vertical canal of ear ; H.C., horizontal canal of ear ; L.L.B.X., lateral-line branch of the vagus • O.C., olfactory capsule; P., large process attached to upper jaw; P.V.C., posterior vertical canal of ear; U., utriculus of ear; V.B.X., visceral branch' of vagus; X., vagus nerve. P l a t e L X I. Centropliorus calceus. Fig. 16. Dissection of the cranial nerves in the left orbital region. B.V., bloodvessel running parallel with the inferior rectus muscle; C.M., cavity lodging muscle (M.2 in fig. 17); C.T.VTI., chorda tympani of facialis; E.M.VII., external mandibular of facialis; EX.C., anterior branch of |