144 Inez Whipple Wilder. 



From near the anterior end of the gland, in all of the specimens 

 which I have examined, a single duct was found to extend over the 

 posterior margin of the fenestra rostralis (Bruner's nomenclature) 

 of the cartilaginous capsule, from whence it passes through a notice- 

 able thickening in the wall of the nasal cavity, and opens upon its 

 inner surface. I had the opportunity to study the same series of 

 transverse sections of the adult head from which Wilder drew his 

 conclusions above quoted, as to the existence of two ducts to the gland, 

 and I examined these sections with especial reference to the relation 

 of these ducts to the glandular mass. One duct could be definitely 



Fig. 1. — Transverse section through the introductory nasal passage of a 

 small adult Amphiuma tridactyluni. x ^^ 2/3. This section and those shown 

 in Figs. 2, 3, and 4 are taken from the same series from which the recon- 

 structions given on Plate I., Figs. B, C, and D were made. The locations of 

 the sections are indicated upon Fig. D by lines correspondingly numbered. 

 Abbreviations : ci, insertion of the constrictor naris muscle into the nasal 

 epithelium ; in, introductory nasal passage ; na, nasal capsule ; P, portion of 

 the premaxillary bone. * 



traced to the alveoli of the gland; the second duct, however, when 

 traced back from its orifice, which was slightly posterior and ventral 

 to that of the first, was found to end blindly in close proximity to the 

 gUmdular mass, but without actual connection with it (cf. Fig. 2, 

 and Plate I, Figs. C and D, ad). 



In connection with the opening of the duct of the gland the con- 

 formation of the nasal cavity must be understood. From the external 

 naris the nasal passage extends at first somewhat mesially, then 

 almost directly posteriorly for a short distance, the longer diameter 

 of its lumen having in this region a horizontal position. In the 



