PLATE XLIX. 



Tritaxia. — Valvulina. 

 Figures 1-7. — Tritaxia caperata, Brady, 



Figs. 1 a, 2. Adult specimens, lateral aspect ; 1 h. oral 



aspect, .... 



Fig. 3 a, Young specimen, lateral aspect ; b, oral 



aspect, .... 



Fig. 4. Specimen laid open longitudinally ; fig. 5, 



specimen broken transversely; — showing the 



labyrinthic interior, 

 Fig. 6. Longitudinal section of the test, 

 Fig. 7. Portion of the outer wall of the same more 



highly magnified, showing the pore-canals, . x 120 



„ 8, 9. — Tritaxia tricarinata, Reuss, . . . x 35 389 



Figs. 8 a, 9. Lateral aspect ; b, oral aspect. 



„ 10, 11. — Tritaxia indiscreta, Brady, . . x 25 389 



Figs. 10", 11. Lateral aspect ; 10/*, oral aspect. 



12.— Tritaxia lepida, Brady, . . . x 80 389 



a, Lateral aspect ; /), oral aspect. 



„ 13, 14. — Valvulina fusca, Williamson sp., .... 392 



Fig. 13. a, Superior aspect; 6, inferior aspect; c, peri- 

 pheral aspect, . . . x 50 

 Fig. 14. Adherent specimen, . ■ x 40 



„ 15, 16. — Valvulina arnica, Parker and Jones, . . . 392 



Fig. 15. a, Superior aspect; b, inferior aspect ; c. peri- 

 pheral aspect, . . . .x 50 



Fig. 16. Colony of specimens adherent to the test of 



Saccammma sphcerica, . . x 40 



