. Bulletin - United States National Museum. Science. Fig. 26. FIG. 27. Fig. 2S. Figs. 20-28.—20, The digestive titbe and disk ambulacra of Antedon bifida, a comatuud with an endo- ctcuc mouth (adapted from p. h. carpenter). 21, the digesth'e tube and disk ambulacra of one of the spectes OF THE FAMILY , ILLUSTRATING A COMATULID WITH AN EXOCYCLIC MOUTH ( FROM P. H. CARPENTER). 22, DLIGRAM SHOWING THE COMPARATIVE RELATIONSHIPS BETWEEN THE AMBULACRA, ANAL TUBE, AND ARMS IN A FIVE- ARMED ENDOCYCLIC COMATULID; THE AXIS d-d IS THE PRIMARY ANTEROPOSTERIOR AXIS. 23, DI
. Bulletin - United States National Museum. Science. Fig. 26. FIG. 27. Fig. 2S. Figs. 20-28.—20, The digestive titbe and disk ambulacra of Antedon bifida, a comatuud with an endo- ctcuc mouth (adapted from p. h. carpenter). 21, the digesth'e tube and disk ambulacra of one of the spectes OF THE FAMILY , ILLUSTRATING A COMATULID WITH AN EXOCYCLIC MOUTH ( FROM P. H. CARPENTER). 22, DLIGRAM SHOWING THE COMPARATIVE RELATIONSHIPS BETWEEN THE AMBULACRA, ANAL TUBE, AND ARMS IN A FIVE- ARMED ENDOCYCLIC COMATULID; THE AXIS d-d IS THE PRIMARY ANTEROPOSTERIOR AXIS. 23, DIAGRAM SHOWING THE COM- PARATn'E RELATIONSHIPS THE AMBULACRA, ANAL TUBE, AND ARMS IN A TEN-ARMED ENDOCTCUC COMATULID; THE AXIS a-a IS THE PRIMARY ANTEROPOSTERIOR AXIS. 24, DUGRAM SHOWING THE COMPARATn'E ;! BETWEEN THE AMBULACRA, ANAL TUBE, AND ARMS IN A TWENTY-ARMED ENDOCYXUC COMATUUD; THE AXIS a-a IS THE PRIMARY ANTERO- POSTERIOR AXIS. 25, DLAGRAM THE COMPARATIVE RELATIONSHIPS BETWEEN THE AMBULACRA, TUBE, AND ARMS IN A TEN-ARMED EXOCYCLIC COMATUUD, OR COMASTERID, IN WHICH ALL OF THE ARMS ARE PRONIDED WITH AMBULACRAL GROOVES, AND IN WHICH THE MOUTH IS RADIAL IN POSITION; THE AXIS a-a IS THE PRIMARY ANTEROPOSTERIOR AXIS. 26, DIA- GRAM SHOWING THE COMPARATIVE RELATIONSHIPS BETWEEN THE AMBULACRA, ANAL TUBE, AND ARMS IN A TEN-ARMED EXOCYXUC COMATULID, OR COMASTERID, IN WHICH ALL OF THE ARMS ARE PROVIDED WITH AMBULACRAL GROOVES, AND IN WHICH THE MOUTH IS INTERRADIAL IN POSITION; THE AXIS a-a IS THE PRIMARY ANTEROPOSTERIOR, THE AXIS b-b THE SEC- ONDARY ANTEROPOSTERIOR. 27, DIAGRAM SHOWING THE COMPARATIVE RELATIONSHIPS BETWEEN THE AMBULACRA, ANAL TUBE, AND ARMS IN A TEN-ARMED EXOCYCUC COMATULID, OR COMASTERID, IN WHICH EIGHT OF THE ARMS ARE PROMDED WITH AMBULACRAL GROOVES AND TWO ARE UNGROOVED, AND IN WHICH THE MOUTH IS INTERRADIAL IN POSITION; THE AXIS a-a IS THE PRI5IARY ANTEROPOSTERIOR, THE AXIS b-b THE SECONDARY' ANTEROPOSTERIOR. 2S, DIAG
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