96 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 



cc. Color brown, with longitudinal and transverse white mark- 

 ings. 



1. Body slender, up to a meter in length ; color brown, with 



numerous narrow transverse rings and three parallel, 

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

 median line and one just below each lateral margin . 



C. copistruta, p. Hi. 



2. Body slender, subcylindrical, 15 cm. or more in length; 



color deep brown, witli a series of white rings and four 

 longitudinal w^hite lines, of which two are lateral, while 

 the other two divide dorsal surface of body into three 

 equal parts . . . '. C. cinguhttn, p. 120. 



3. Body slender, subcylindrical, often half a meter or more in 



length when fully extended ; color brown or chocolate, 

 with nimierous narrow transverse rings and five or six 

 parallel longitudinal white lines, of which one is in the 

 median dorsal line, two on each lateral surface, and the 

 sixth, when present, is usually merely indicated in the 

 ventro-median line . . C. sexlineata, p. 111. 



BB. Lateral nerves situated outside muscular layers in esophageal 

 region, but imbedded in longitudinal muscles behind nephridial 

 region ; intestine lobed, but without paired diverticula ; cere- 

 bral sense organs wanting . . Carinomella, p. 12.5. 

 1. Body slender, usually 5 to 10 cm. in length ; milk-white and some- 

 what translucent, sometimes with yellowish or brownish intes- 

 tinal canal ...... C. luctea, p. 127. 



AA. Paired intestinal diverticula present . . . . . C. 



C. Internal circular muscles enormously develo^jed in nephridial 

 region ; mouth situated immediately behind brain ; body not 

 very slender ; head broader than neck ; nephridia well devel- 

 oped ....... Carinoma, p. 143. 



1. Body rather stout, flattened posteriorly ; milk-white, with gray- 

 ish or brownish mottlings and darker intestinal lobes. 



C. mutahilis, p. 144. 

 CC. Internal circiilar muscles but little developed in any portion of 

 body ; mouth situated far behind brain.; body filiform ; head 

 sharply pointed ; nephridia not known. 



Cephalothrix, p. 153. 

 1. Slender, filiform; whitish or pale yellow, sometimes with red- 

 dish, grayish or greenish tinge; no ocelli in adult. 



C. linearis, p. 153. 



