EY J. J. FLETCIIEI?, B.A., B.Sc. Gio 



Osplircuiter rohuslits. — The animal from which my specime]i 

 came was a line adult female, measuring 33 in. The pouch was 

 empty and very large, and its v/alls were covered with much of 

 the brown secretion, such as Morgan,* more than half a century 

 ago had observed " alu^-ays to exist in these animals during the 

 periods at which tlie pouch remains unoccupied by the young." 

 One of the functional teats was slightly longer than the other, 

 otherwise each of them as well as each of the two supplemental 

 teats measured nearly \ in. The left uterus contained a blasto- 

 dermic vesicle about the size of a pea. 



This is the finest specimen of the urogenital organs I have 

 seen, and shews the direct communicatiou excellently, its orifice 

 being veiy large, and having the usupJ situation on the median 

 ridge just in advance of the meatus urinarius, which is only half 

 the size. 



The urogenital canal, measured from the anterior end of i\\Q 

 median ridge to its distal margin is 2i in. long as compared with 2 

 in. in each of specimens («) and (b.) of the same species of my 

 former paper. This is slightly longer than I have found it in 

 four specimens of O. riifus, and very much longer than I have 

 ever seen it in 21. major. A further comparison of the organs in 

 these three species, the animals of which attain much Vne same 

 size, will be given later on. The urogenital canal shews the two 

 principal longitudinal ridges and also the median one very well 

 indeed. In addition there is a well-marked though not so 

 prominent secondary longitudinal ridge on the outer side of each 

 of the main ridges and running parallel with it at a distance equal 

 to that vrhieh intervenes between each of these and the median 

 one. One of these secondary ridges runs to the inner side, llie 

 other to the outer side, of the entrance to the lateral canal on the 

 respective sides. There is also another ridge on the dorsal wall. 

 Each of the main ridges is IH- in. long, iVin. high, and i% broad, 



* Morgan, Li:iiiean hjoo. Trans., xvi.^ 1831. 



