8 COE 



2. Color brown or chocolate with numerous narrow, transverse white rings 



and five parallel, longitudinal white lines, of which one is in the dorso- 

 median line, and two on each lateral surface C. dinema, p. 15. 



3. Color brown with numerous narrow transverse rings and three parallel, lon- 



gitudinal white lines of which one is in the dorso-median line and one just 

 below each lateral margin C capistrata, p. 16. 



Order MESONEMERTEA. 



A. Body musculature consists of a thin outer circular layer and a 

 strong inner longitudinal layer — an inner circular layer is 

 usually wanting entirely, or, if present, is much reduced. Body 

 long and filiform, often coiled in a close spiral. Head sharply 

 pointed. Mouth placed very far behind the brain. Neph- 

 ridia not discovered Cephalothrix^ p. 19. 



I. Slender, filiform, pale yellow, sometimes with reddish, grayish or greenish 

 tinge. No ocelli in adult C. linearis, ^. 19. 



AA. Body musculature consists of a thin outer circular layer, a 

 diagonal layer, a longitudinal layer, and, in the esophagal re- 

 gion, an additional, enormously developed inner circular layer. 

 Head broader than neck. Nephridia w^ell developed. 



Carinoma^ p. 20. 



I. Bodjrather stout, flattened posteriorly. Mouth close behind brain. Milk- 

 white with grayish or brownish mottlings, and darker intestinal lobes. 



C griffini, p. 20. 



Order METANEMERTEA. 



A. Body long and slender. Proboscis sheath usually less than half 

 the length of body. Proboscis small ; central stylet usually 

 small Emplectonema ^ p. 23 . 



1. Stylets slender, curved. Dark green or pale green above, and whitish or 



very pale greenish below E. gracile, ^. 23. 



2. Stylets straight and short, with swollen bases. Basis of central stylet 



swollen and rounded posteriorly. Dark brown above, flesh-color be- 

 neath B. biirgeri, p. 25. 



AA. Body moderately elongated. Proboscis sheath about 3^ to ^ the 

 length of body. Central stylet well developed, 



Paranemertes^ P- 32- 



1. Two or 4 pouches of accessory stylets. Color purplish brown, dark-brown, 



or orange-brown above, on sides, and on lateral margins of ventral sur- 

 face; rest of ventral surface (often only the median third) white or 

 yellowish white P. peregyina, p. 33. 



2. Four pouches of accessory stylets. Opaque white P. pallida, p. 36. 



