coe: nemerteans of west and northwest coasts. 



17 



of the head. Their secretions are discharged mainly into the tubu- 

 lar frontal organ. 



In the Lineidae the ce])halic glands do not extend behind the 

 anterior border of the brain except in a few species, and they are 

 commonly limited to the dorsal portion of the head except for a 

 short distance near the tip of the snout, where they occur also in 

 the ventral portion. 



In Linens rubescens a peculiar condition prevails, for here a very 

 conspicuous duct lies directly beneath the rhynchodaeum and leads 

 forward from the more posterior glands, to discharge their secretions 

 on the tip of the snout beneath the proboscis pore. 



In Geonemeetes these glands are enormously developed, and 



,-,-'i>y 



Fig. 3. — Amphiporus nebulosus. Transverse section through ventral commissure 

 of brain, allowing very numerous submuscular glands {svv/j occupying a large 

 portion of tissues of ventral half of body ; e, stomach ; re, rhynchocoel. 



discharge their secretions into a--large, tubular pit, situated immedi- 

 ately dorsal to the rhynchodaeum. This pit not only discharges the 

 secretions from the cephalic glands, but also serves as a highly spe- 

 cialized sense organ (von Kennel, '78 ; Coe, : 04). 



Submuscular glands. — In many species of hoplonemerteans 

 more or less numerous glands are found which in form and function 

 resemble the true cephalic glands, but which are situated in the body 

 parenchyma between or beneath the muscular layers of the body 



