BY R. BUOOM. 595 



short duct lined with squamous epithelium. On the left side, 

 which is further back, the opening of the organ into the naso- 

 palatine canal is closing, while the connection between the canal 

 and the nasal cavity is seen. Immediately beyond this plane 

 Jacobson's ox'gan is closed and the lower part of the inner plate 

 of Jacobson's cartilage becomes connected with the outer bar, 

 forming a floor to the organ; and what was the naso-palatine canal 

 becomes lost in the general nasal cavity. 



Fig. 4 represents a section througii the l^ody of the organ. The 

 cartilage on section assumes the appearance of an irregular L or a 

 U with the outer side shorter than the other — an appearance 

 very common in Marsupial types. It is supported on its lower 

 and inner sides by the scroll-like palatine-process of the pre- 

 maxilla. The organ on section is kidney-shaped, with a much 

 indented lulus, which accommodates the rather large blood vessel. 



Dasi/urics viverrinus, Shaw, (two-thirds grown). In the grown 

 Dasyure the condition of parts is essentially similar to that in the 

 young. Fig. 5 shows a section in the region of the hinder j)art 

 of the papilla — a portion of the papillary cartilage being seen. 

 The nasal-floor cartilage is moderately flat, and somewhat above 

 its inner end by the side of the septum is seen the small precurrent 

 process of cartilage supporting the septal ridge. In iig. 6 the pre- 

 maxillary is about to give off its palatine process. The naso- 

 palatine canal is seen cut across below the isthmus, while above 

 it the nasal-floor cartilage is dipping down into the hollow. The 

 outer part of the nasal-floor cartilage behind this becomes lost in 

 /). viverrinus, though in D. inaculatus it is seen for a short time 

 as a very small fragment on the outer side of the nasopalatine 

 canal. The organ opens into the naso-palatine canal almost 

 immediately behind the plane of rig. 7. Fig. 8 is just behind the 

 opening of the organ and immediately in front of the plane where 

 the naso-palatine becomes part of the general nasal cavity. Here 

 the organ is roofed over by the union of the inner plate of Jacob- 

 son's cartilage with the outer bar. In fig. 9, a little further back, 

 the upper union with the outer bar is lost and the lower connec- 



