59] THE NA SA L ORG A N IN A MPHIBIA —HIGGINS 59 



externa to other parts of the capsule; although differing in their relations 

 to each other, and in their position in the capsule, their homology is very 

 evident. The ventral of these two bars is the cornu trabecula, more slender 

 and cylindrical in Pipa; while in Bufo it is greatly reduced in length, con- 

 siderably broader and has been designated in this paper as the solum 

 anterius. The junction in both groups of this cartilage with the alinasal 

 cartilage is a further evidence of their homology. The dorsal of the two 

 bars, above mentioned, is apparently an additional structure in the Anura, 

 for I do not recognize it in any Urodele. The term oblique cartilage seems 

 to best designate this bar, extending, as it does, obliquely forwards and 

 upwards from the lamina externa to the planum tectale, or as in Pipa to 

 the tip of the planum verticale. 



