COE: NEMERTEANS OF WEST AND NORTHWEST COASTS. 95 



1. Without sucker ; intestine not convoluted. 



2. Proboscis without stylets ; mouth posterior to brain ; intestinal 



caecum absent. 



3 . Muscular walls of body in two layers — - outer circular and inner 



longitudinal — to which a third — inner circular — is sometimes 



added ; lateral nerves either outside muscular layers or imbedded 



in longitudinal muscles ; cutis absent. 



Order Paleonemertea. 



3^. Musciilar walls of body in three main layers, of which the inner 



is longitudinal ; lateral nerves outside circular muscular layer ; 



cutis well developed . . Order Hetkronemertea. 



2'. Proboscis usually provided with stylets; mouth in front of brain, 



usually opening with proboscis in a single terminal or subterminal 



pore ; intestinal caecum usually present ; lateral nerves internal to 



muscular layers of body walls . Order Hoplonemertea. 



1^ . With sucking disk at posterior end of body ; intestine convoluted . 



Order Bdellonemertea. 



Paleonemertea. 



A. Paired intestinal diverticula absent . . . . . B. 



B. Lateral nerves situated immediately outside circular muscles of 

 body walls ...... Carinella, p. 108. 



a. Body of somewhat homogeneous color, without definite mark- 

 ings. 

 1. Body very soft, attaining a length of upwards of 2 meters 

 when fully extended ; color deep red, orange, or bright vermil- 

 ion C. rubra, p. 109. 



2.^ Body minute, very slender, whitish and somewhat translucent. 



C. peUucida, p. 122. 

 aa. AVith distinct longitudinal and transverse markings . b. 



b. Color yellow, rosy or greenish, with black longitudinal and 

 transverse markings. 

 1. Body large, rather firm, only moderately slender, attain- 

 ing a length of .50 cm. or more ; pale yellowish or rosy, 

 sometimes with greeilish tinge, with 3 longitudinal, vel- 

 vety, black lines and a series of narrow rings of similar 



color C.frenata, p. 11.5. 



bb. Color red or brown, with white markings . . . c. 



c. Color deep red, with a series of narrow white rings, but with- 

 out longitudinal lines. 

 1. Body firm, rather stout, upwards of 30 cm. long ; deep red, 

 with a series of narrow white rings placed at frequent 

 intervals throughout body . . C. albocincta p. 118. 



