Key

(from Allan Hancock Pacific expeditions vol. 1 1943)

Family Baseodiscidae

Genus Baseodiscus Diesing

Four species of this genus have been reported from the North Pacific coast.

Key to Species

1. With narrow transverse rings of vi^hite throughout length of body. Body of moderate diameter but may be of great length, sometimes exceeding 2 m; red or brown, with numerous narrow white rings encircling the body....mexicanus
1. Without white rings....2

2. Longitudinally striated with numerous interrupted and irregularly anastomosing, very narrow black or dark brown lines....delineatus
2. Without longitudinal striations....3

3. Yellow, thickly sprinkled with small, irregular, dark red spots; body may reach very large size, sometimes 2 m or more in length....princeps
3. Deep red, orange red, mahogany, or reddish brown, sometimes covered with whitish bloom ; anterior portion of head with broad spot of darker color, bordered terminally and laterally by white....punnetti