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Show 887.J PROF T. J. PARKER ON CARCHARODON RONDELETII. 39 Fig. 3. Cranium of Carcharodon rondeletii, ventral aspect, X £. 4. Cranium of Lamna cornubica, ventral aspect, X |. _ merences to Figs. 1-4.-aq.fall, aqueductus Fallopii; font, fontanelle; inJ.orb.pl, infraorbital plate; olf, olfactory capsule; p.orb.pr, postorbital process; p.ot.pr, parotic process; rostd, dorsal bar of rostrum; rosP, ventral par of rostrum ; vert.cent. 1, first vertebral body ; ix., glossopharyngeal foramen ; x, vagus foramen. " ' 6 PLATE V. i 'g. 5. Cranium of Carcharodon rondeletii from the left side, with the upper and lower jaws, X-j. car.f, carotid foramen; h.m, facet for hyomandibular; inf.orb.pl, infraorbital plate ; oIf olfactory capsule ; op.ped, facet for ophthalmic peduncle ; p.orb.pr, postorbital process ; rostA, dorsal, and rost", ventral bar of rostrum ; sup.orb.pl, supraorbital plate ; ii. optic foramen ; iii. oculomotor foramen ; iv. foramen for fourth nerve ; v. trigeminal foramen; vii. facial foramen. 6. Anterior extremity of vertebral column of the same showing its junction with the cranium, X j . i, intercalary cartilage ; n.a, neural arch ; vert.cent. 3, third vertebral body ; x, vagus foramen. 7- Part of the neural tube of the same, from the dorsal aspect, x|. 1, intercalaria ; n. a, neural arches. 8. Part of one of the ha.mal ridges of the same, from tbe ventral aspect, X -j. Hce, hasmapophyses; i, intercalaria; r, rib. 9. Hip-girdle and left pelvic fin of the same, X-j. a, propterygial cartilage; bs.ptg, basipterygium; dp, cartilage of clasper; pu, pubic bar. 10. Ventral (so-called anal) fin of the same, X 2- 11. Cranium of Lamna cornubica from the left side, with the upper and lower jaws, xf. The reference letters have the same significance as in fig. 5. PLATE VI. Carcharodon rondeletii. Fig. 12. Posterior extremity of vertebral column, X-j. Hce, hasmapophysis ; hce.sp, haemal spine; ptg, pterygiophore or radial cartilage; vert. cent. 107, 130, & 167, the 107th, 130th, and 167th vertebral bodies. 13. Vertical section of a trunk vertebra, X \- 14. Vertical section of a caudal vertebra, X ^. 15. The second dorsal fin, x f . 16. The stomach and intestine, with the spleen and pancreas, from the ventral aspect, X^V- b.d, bile-duct; card.st, cardiac portion of stomach; int, intestine; pan, pancreas; pyl.st, pyloric portion of stomach; ret, rectum; rct.gl, rectal gland ; spl, spleen; x, sac-like dilatations of stomach. 17. The cloaca with the rectal gland, urinary bladder, and extremities of the rectum and left oviduct, XTV". cl1, inner, and cl2, outer compartment of cloaca; l.ovd, left oviduct; ovd.ap, aperture of oviduct; ret, rectum ; rct.gl, rectal gland ; ur.ap, urinary aperture; ur.bl, urinary bladder. 18. The heart from the ventral aspect, the conus arteriosus being opened by a longitudinal incision, x£. aur, auricle; con.art, conus arteriosus; vent, ventricle; v\ v2, v3, the three rows of aortic valves. P L A T E VII. Carcharodon rondeletii. Fi_r 19 Transverse section of the caudal region, XTV- 20 The brain from the dorsal aspect, the tela vasculosa being removed on the left side, nat. size. .„.,., 21 Anterior part of the brain with the cavities laid open from above, nat. size • a bristle (x, y) is passed from the mesoccele into the diaccele. |