Bull. U. S. F. C. 1899. (To face page 24.) 
Plate 1 1 . 
EXPLANATION OF PLATE 
1. Part of calcareous ring of Synapta inhcerens. 45 X- 
2 Part of calcareous ring of Synapta roseola 45 X. 
3. Calcareous particles from the tentacles of S infuerens. 450 X 
4. Calcareous particles from the tentacles of S- roseola. 450 X. 
5. Calcareous particles from the longitudinal muscles of Synapta 
inhcerens. 450 X . 
6. Calcareous particles from the longitudinal muscles of Synapta 
roseola. 450 X. 
7. Large ciliated funnel of Synapta inhcerens. Seen from behind 
1 25 X . 
8. Large ciliated funnel of Synapta roseola. Seen from in front. 
337 X. 
