114 EDWARD PHELPS ALUS, JUN. 



ampullge that form a band along the lateral edge of the dorsal 

 sui-face of the snout. There were forty-three pores in the 

 sub-group. 



The tubules of a second sub-group run upward, forward, 

 and mesially along the anterior edge of the eye, and there 

 spread, some continuing their earlier course, while others 

 turn backward above the eye. The pores of the subgroup 

 all lie between the antero-dorsal edge of the eye and that 

 part of the supra-orbital canal that lies posterior to the point 

 where the canal bends forward in front of the eye. There 

 were thirty-seven pores in the group. 



The tubules of a third sub-group all open on the ventral 

 surface of the head, the tubules running in large part 

 mesially, but in part almost directly fotward, and in part 

 almost directly backAvard. The few tubules that run directly 

 forward have their external openings along either side of the 

 extreme distal end of the supra-orbital canal, that is, along 

 both sides of the posterior end of what Garnian calls the sub- 

 rostral canal. Those tubules that run posteriorly open in a 

 group of pores that lie mesial to the anterior end of the 

 hyomandibular canal. Those tubules that run mesially spread, 

 and their external openings form a scattered group of pores 

 the larger part of which lie between the nasal section of the 

 infra-orbital canal and the front edge of the mouth, a smaller 

 part lying between the same section of canal and the nasal 

 aperture. Certain of these pores form a line along each edge 

 of the nasal section of the infra-orbital canal, while certain 

 others form a marked line along the very edge of the upper 

 lip. There were 107 pores in this sub-group. 



The tubules of a fourth sub-group run backward and, 

 excepting a few scattered ones, form a wide band of tubules 

 which extends backward ventral to the suborbital part of 

 the infra-orbital canal, occupying the entire lateral surface of 

 the head ventral to that canal. The external openings of the 

 few scattered tubules, and those also of certain of the longer 

 ones, lie on the lateral surface of the head posterior to that 

 section of the infra-orbital canal that lies between the sub- 



