1887. J PKOF T. J. PARKER ON CARCHARODON RONDKI.ETIl. 39 



Fig. 3. Cranium of Carcharochn rondektii, ventral aspect, X^. 

 4. Cranium of Lamna corimbica, ventral aspect, X |. 



'References fo Figs. 1-4. — aq.fall, aqueductus Fallopii ; font, fontanelle ; 

 inf.orh.fl, infraorbital plate ; olf, olfactory capsule ; p.orb.pr, postorbital 

 process ; f.oi.'pr, parotic process ; rod"^, dorsal bar of rostrum ; rosP, ventral 

 par of rostrum ; vert.ccnt. 1, first_ vertebral body ; i.v., glossopbaryngeal foramen ; 

 X, vagus foramen. 



Plate V. 

 Fig. 5. Cranium of CarchaTodon rondeletii from the left side, with the upper 

 and lower jaws, X5. car.f carotid foramen; k.m, facet for 

 hyomandibular ; inf. orb.pl, infraorbital plate ; olf, olfactory capsule; 

 op.ped, facet for ojjhthalmic peduncle ; p.orb.pr, postorbital process ; 

 rosf^, dorsal, and rost", ventral bar of rostrum ; siip.orb.pl, supra- 

 orbital plate ; ii. optic foramen ; Hi. 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, Xj. «', intercalary cartilage ; ra.«, neural 

 arch ; vert.ccnt. 3, third vertebral body ; x, vagus foramen. 



7. Part of the neural tube of the same, from the dorsal aspect, X J. /, 



intercalaria ; 11. a, neural arches. 



8. Part of one of the hrenial ridges of tlie same, from the ventral aspect, 



Xj. ife, htemapophyses ; ?, intercalaria ; r, rib. 



9. Hip-girdle and left pelvic fin of the same, X5. a, propterygial 



cartilage; bs.ptg, basipterygium ; dp, cartilage of clasper; p^i, 

 pubic bar. 



10. Ventral (so-caUed anal) fin of the same, X |. 



11. Cranium of Lamna cornubica iro\n the left side, with the upper and 



lower jaws, Xj. The reference letters have the same significance 

 as in fig. 5. 



Plate VI. 

 Careharodon rondeletii. 

 Fig. 12. Posterior extremity of vertebral coluiun, X^. H<b, haemapophysis ; 

 ha.sp, haemal spine ; pitg, pterygiophore or radial cartilage ; vert, 

 cent. 107, 130, & 167, the 107th, 130th, and 167th vertebral bodies. 



13. Vertical section of a trunk vertebra, x4. 



14. Vertical section of a caudal vertebra, X j. 



15. The second dorsal fin, x|- 



16. The stomach and intestine, with the spleen and pancreas, from the 



ventral aspect, X^V- b.d, hile-duct ; card.st, cardiac portion of 

 stomach; MJif, - intestine ; pan, pancreas ; ^yAj*;*, pyloric poi-tion of 

 stomach ; ret, rectum ; rct.gl, rectal gland ; spl, spleen ; x, sac-like 

 dihitations of stomach. 



17. The cloaca with the rectal gland, urinary bladder, and extremities of 



the rectum and left oviduct, X tV- c^\ inner, and cP, outer 

 compartment of cloaca ; l.ovd, left oviduct ; ovd.ap, apertm-e 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:j. aur, aui-icle ; con.art, 

 conus arteriosus ; vent, ventricle ; v^, v'-, v^, the three rows of 

 aortic valves. 



Plate VII. 



Careharodon rondeletii. 

 Fig. 19. Tran.sverse section of the caudal region, Xth- 



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 (.r, y) is passed from the meeoccele into the diaeoele. 



