ABBREVIATIONS. 



ad, atrophied duct of lateral gland. 



alb, somewhat isolated anterior lobe of gland. 



ant, external naris. 



c, constrictor muscle. 



ci, insertion of constrictor into the nasal epithelium. 



CO, origin of constrictor, cut from the inner surface of the nasal capsule. 



d, the duct of the lateral gland, 

 dl, the dilatator muscle. 



dlo, the origin of the dilatator muscle cut from the inner surface of the 

 nasal capsule. 



fr, fenestra rostralis. 



g, lateral gland. 



in, introductory nasal passage. 



M, maxillary bone. 



N, nasal bone. 



na, nasal capsule. 



ne, nasal epithelium. 



EXPLANATION OF, PLATE I. 



Fig. a. Dissection of snout of adult Amphiuma showing the relation of 

 the laternal or external nasal gland to siu"rounding parts. 



Fig. B. Drawing, based on a millimeter paper reconstruction, showing 

 a lateral view of the anterior portion of the left cartilaginous nasal capsule 

 of an adult Amphiuma. 



Fig. C. Drawing, based on a millimeter paper reconstruction, showing 

 the relationship of the constrictor and dilatator muscles to the walls of 

 the introductory nasal passage of an adult Amphiuma, left lateral view. 



Fig. D. Drawing, based upon a millimeter paper reconstruction, showing 

 the anterior nasal region of Amphiuma, lateral view of left side. 



