Name:
Phellia bathybia Reference: Danielssen D. C., 1890, Plate XIII , fig. 9
View: Column, cross section
Caption: "Fig. 9. Transversal section of the integument, magnified. a. The æsophagus; b. Gullet-groove; c. Longitudinal muscles of the directive septa. R. Directive septa. 1. Principal, perfect septa. 2. Secondary, perfect septa.'"