Os Penis of some Genera o/Mustelidee. 311 



from it at all ages in M. martes, as established by Pohl and 

 others. 



Genus GETSON, Gray. 



In an example of Grison furax from Cordova, in Argen- 

 tina, the baculum is slender and moderately long, with a 

 sinuous curvature in its thicker basal third, the rest of the 

 main shaft being straight and attenuated, and approximately 

 the terminal sixth a little expanded and depressed. The 

 posterior third is compressed and carinate above, flat but not 

 grooved below. From the posterior third up to the depressed 

 termination the slender shaft is cylindrical and marked below 

 by a narrow linear groove. The terminal piece is parallel- 

 sided and apically rounded. It is depressed at an angle of 

 about 140°, and just at the bend on the upper side there rises 

 a pair of erect horn-like apically rounded excrescences. 

 Total length 44 mm. ; length of depressed termination 6 mm., 

 width across the horns 3 mm., of narrowest part just behind 

 the horns 2 mm. 



This baculum differs from that of all the Mustelidae in 

 which the bone has been described in having the end de- 

 pressed and provided with two short upstanding processes on 

 the dorsal side a little behind the apex. At first sight it 

 recalls the baculum of the Procyonid Bassariscus described 

 by Lonnberg (Anat. Anz. xxxviii. p. 232, 1911), but in that 

 genus the two processes arise from the underside of the bone. 



Genus MellivORA, Storr. 



The baculum of this genus was very briefly described by 

 Gilbert, and the description was repeated by Pohl, to whom 

 the bone itself was quite unknown. It may be interesting 

 and useful, therefore, to publish a figure and a new descrip- 

 tion of it. 



Baculum deep and wide at its root, attenuated and tolerably 

 straight for rive-sixths of its length, the terminal sixth being 

 upturned and expanded. The upper edge of the basal half 

 somewhat compressed and subcarinate. The lower surface 

 widely grooved longitudinally. The wide apex not recurved, 

 but directed forwards and upwards and expanded into a cup- 

 shaped hollow much wider from side to side than from above 

 downwards. The thin upper and lateral rims of the cup 

 form a continuous nearly semicircular curve, but the lower 

 rim is transverse and interrupted in the middle line by a 

 narrow deep cleft which at the bottom passes into the groove 



