COE. — Nemerteans. 



PLATE 21. 



Amphiporus punctatulus Coe. 



Fig. 129. Outline of head from dorsal surface, showing arrangement of 

 ocelli, and position of brain and cerebral sense organs. X 18. 



Fig. 130. Outline of head in state of contraction, showing arrangement of 

 ocelli. X 18. 



Fig. 131. Sagittal section of head, showing the highly developed cephalic 

 glands, position of ocelli, nephridia, muscular layers, brain, and 

 posterior end of cerebral sense organ. X 32. 



Fig. 132. Transverse section of body near posterior extremity, showing the 

 layer of inner circular muscles {icm) surrounding the rectum (r) 

 and the dorso-ventral muscles (dom). The lateral nerves (In) are 

 situated in the midst of the body parenchyma. X 78. 



Fig. 133. Transverse section of body near anus and behind lateral nerves, 

 showing the thick layer of inner circular muscles surrounding 

 the posterior end of rectum. X 78. 



Fig. 134. Portion of transverse section of body near anus, showing inner 

 circular muscular layer (icm) surrounding posterior end of 

 rectum (r) and radially arranged fibers extending peripherally. 

 X 230. 



Fig. 135. Outline of central stylet and basis in four individuals. X 58. 



Fig. 136. Central stylet and basis, showing central core of stylet. X 135. 



Fig. 137. A single accessory stylet, .showing central core. X 240. 



Fig. 138. Central .stylet and basis in two individuals. X 80. 



Fig. 139. Five accessory stylets with outline of central core. X 105. 



Fig. 140. Accessory stylets, outline only. X 105. 



