PLATE XVII 



FIG. x. Tetrastemma nigrifrons sp. nov. Variety purpureum. Dorsal side of 

 anterior portion of body ; head much contracted. Monterey, Calif. 

 Enlarged five times. Compare fig. 7, pi. xiv, figs. 6-9, pi. xvi. 

 a. Lineus albolineatus sp. nov. Dorsal side of anterior portion of body. 

 Dredged in thirty fathoms off Point Fermin, near San Pedro, Calif. 

 Enlarged four times. 



3. Lineus JIavescens sp. nov. Dredged in fifty fathoms between San Pedro 



and Santa Catalina Island, Calif. Enlarged three times. 



4. L. JJavescens. Dorsal view of anterior portion of body showing arrange- 



ment of ocelli, position of ganglia, and the two portions of esophageal 

 region. Enlarged ten times. 



5. Lineus pictifrons sp. nov. Large individual. San Pedro, Calif. En- 



larged one and one-half times. The longitudinal yellow lines are ex- 

 tremely delicate (and sometimes entirely wanting) in life, and appear 

 much too distinct in this figure. 



6. L. pictifrons. Dorsal surface of head. Enlarged three times. 



7. Micrura nigrirostris sp. nov. San Pedro, Calif. Enlarged five times. 



8. M. nigrirostris. Ventral side of anterior portion of body. Enlarged 



five times. 



9. Cerebratulus albifrons Coe. Ventral side of anterior portion of body. 



San Pedro Harbor, Calif. Natural size. 



(210) 



