886 MR. AV. AVOODLAXD ON THE [Nov. 27, 



extonial ravotid : ]<]X.I\., external rectus muscle ; HY.VII., lijoiiiandibular 

 of facialis; I NT.]!., internal rectus muscle; I.M.V., inferior maxillary of 

 trigeminus ; I.li., interior rectus muscle ; MN.V., mandibular of trigeminus ; 

 M. 3, muscle in connection with jaw in floor of orbit; O.PA'II., opbtbal- 

 niicus profundus of facialis; O.S.VII., ophthalmicus superticialis of 

 facialis; 0. V. & Vll., ophthalmic branches of trigeminus and facialis; 

 P., large process attached to upper jaw; PS. VII., pre-spiracular of 

 facialis; P.\'1I., jialatine (?) of facialis; S.M.V., superior maxillary of 

 trigeminus ; S.O., superior oblique muscle; S.K., superior rectus muscle; 

 1., oltaclorius; 11. , opticus; III., oculo-motorius ; IV., trochlearis ; 

 V.L., small branch from superior maxillary of trigeminus ; VI., abducens ; 

 VII. & v., three roots of facialis and trigeminus; VIII., auditorius. 

 Fig. 17. Dissection of the cranial nerves in the right orbital region. Three rectus 

 muscles removed. Most rei'erence-letters same as in fig. 16. G., ganglion ; 

 M. 1, M. 2, large muscles in connection with jaws ; MV., small branches 

 of trigeminus to jaw -muscles. 



18. P'emale genitalia. M., mesentery; 0., median oviducal aperture; OD.A., 



anterior part of oviduct ; OU.G., oviducal gland ; OD.M., middle (uterine) 

 portion of oviduct; OD.P., thick-walled posterior portion of oviduct; 

 OV., ovary. 



19. Anterior arteries supplying the oviduct. B., coagulated blood in posterior 



cardinal sinus ; I). A., dorsal aorta. 



Plate LXII. 

 Cmitrojjltorus calcetis. 

 Fig. 20. Ventral, dorsal, and lateral views of an embryo. 



21. Alimentary tract of embryo. B.D., bile-duct; C.A., cloacal aperture; 



J., mass covering junction of large intestine with stomach ; L.I., large 

 intestine; E.G., rectal gland; S., stomach ; U., umbilical duct; V., ven- 

 tricle of heart. 



22. Urinogenitalia of embryo. C.A., cloacal aperture: G., gonads; P.D., 



pronephric duct; T., metamerically-arranged tubules of kidney. 



5. A Siiffffestion concerning' the Orioin unci Sio-niticance of 



OO T> O O 



the " Kenal-Portal System/' with an Appendix relating 

 to the Production of Sub-abdominal Veins. By 

 W. Woodland, F.Z.S., Demonstrator of Zoology, King's 

 College, London. 



[Received October 8, 1906.] 

 (Text-figm^e 139.) 



Literatitre relating to the " renal-portal system " is of small 

 extent and, so far as I am aware, a recent consideration of the 

 subject does not exist. It is doubtful if any physiologist at the 

 present time holds a definite opinion as to the function of this 

 association of kidney and vein, and, though it is universally 

 termed a " portal " system, few realise the absurdities involved by 

 such a supposition. It is in order to expose these absurdities and 

 to suggest what is to my mind a more rational interpretation of 

 this very general feature of vertebrate anatomy that I have 

 ventured, without biinging forward any new facts, to publish the 

 following lines. 



In what follows I have for consistency's sake i-eplaced the terms 

 " renal portal system " and " renal- portal vein " by " renal cardinal 

 mesh work " and " post-renal vein " (expressions not associated 

 with a theory), and I will proceed to justify this change of nomen- 

 clature by first stating as briefly as possible the arguments adverse 



