354 ON THE ORGAN OF JACOBSON IN THE INSECTIVORA. 



EXPLANATION OF THE PLATES. 



Xiettering. 



a.J.c, anterior process of Jacobsoii's cartilage; h.v., blood-vessel ; d.J.n., duct of 

 Jacol)son's organ ; g.d.J.o., duet of gland leading into Jacobson's organ ; J.c., Jacob- 

 son's cartilage ; J.O., Jacobson's organ; l.d., lacrimal duct; Mx., maxilla; Na., 

 nasal; 7i.f.c., nasal-floor cartilage; n.g.d., nasal-gland duct; n.p.c, naso-palatine 

 canal ; o.b.J.c, outer bar of Jacobson's cartilage ; Fmx., premaxilla ; p.Fmx., pala- 

 tine process of premaxilla; r.a.n., recurrent process of alinasal; r.c, recurrent 

 cartilage ; Vo., vomer. 



PiATE III. 



Figs. 1-4. Sections through the snout of Talpa europcea. Young. X 15. 



5-7. Sections through the snout of Talpa europma. Young. Showing 



Jacobson's duct. X 34. 

 8-9. Sections through the snout of Centetes ecaudatus. X 5. 

 10-14. Sections through the snout of Centetes ecaudatus. Showing Jacobson's 

 organ and its duct, and their relations. X 10. 



PXATE IV. 



Figs. 1-7. Sections through the snout of a newly-born Chrysocliloris hottentota 



(greatest length 28 mm.). Figs. 1^, X 15. Figs. 5-7, X 20. 



8-10. Sections through the papillary region of newly-born Chrysocliloris 



hottentota, showing the mode of opening of Jacobson's organ. X 30. 



11-13. Sections through the snout of young Cliri/socldoris asiatica. (About 



half-grown.) X 17. 



