CoE. — Nemerteans. 



PLATE 17. 



Amphiporus formidabilis Griffin. Head and anterior portion of 

 body, showing arrangement of the 200 ocelli and position of brain. 

 X 20. 

 A. formidabilis. Stylet apparatus of proboscis, with central stylet 



and basis and 12 pouches of acessory stylets. X 70. 

 Paranemertes peregrina Coe. Side view of head, showing position 

 of ocelli and boundary between dark color of dorsal surface and 

 lighter color of ventral side of body. X 8. 

 Tetrastemma albidiim Coe, Head and anterior portion of body, 

 showing position of ocelli (with adjacent pigment granules), brain, 

 and cerebral sense organs (cso). X 32. 

 T. albidum. Central stylet and basis. X 440. 



Drepanophorus ritteri Coe. Sketch of head when much compressed 

 after preservation, showing arrangement of ocelli. Those of the 

 marginal groups, however, are in life visible only from the ventral 

 surface, and are arranged more nearly in a single row than in the 

 contracted specimen here shown. X 15- Cf. PI. 24, figs. 179-181. 

 Fig. 107. Emplectonema purpuratinn Coe. Stylet apparatus of proboscis, 

 showing central stylet and basis and the two pouches of accessory 

 stylets, all with longitudinal flutings. X 84. 

 Fig. 108. E.purpuratum. Accessory stylet, showing conspicuous longitudinal 



flutings. X 300. 

 Fig. 109. Amphiporus jyacijicus Coe. Outline of body after preservation. 



xn. 



Fig. 110. A. pacificus. Head and anterior portion of body, showing arrange- 

 ment of ocelli. X 14. 



