792 I-OEAMINIFEBA OF THE KEEIMBA AEOHIPELAGO. 



PLATE LII. 



Figs. 1-6. Discorhina vahidata, var. granulosa nov. Figs, 1-3. Young individuals. 



Fig. 1. Superior viev^^ Fig. 2. Inferior view. Fig. 3. Edge (oral) 



view. Figs. 4-6. Adult individuals. Fig. 4. Superior view. Fig. 5. 



Inferior view. Fig. 6. Edge (dorsal) view. X 45. 

 7-14. Discorhina reniformis, sp. n. Fig. 7. Oblique view. Fig. 8. Superior 



view. Fig. 9. Edge view of a very tliick specimen with obscured 



convolutions. Fig. 10. Side view. Figs. 11-14. Balsam mounts. 



Fig. 11. Inferior view. Fig. 12. Superior view. Fig. 13. Edge view 



of a thick-walled specimen with obscured convolutions. Fig. 14. Side 



view of specimen showing dense outer shell-wall. X 100. 

 15-18. DiscorUna vesicularis (Lamarck). Fig. 15. Superior view. Fig. 16. 



Inferior view. Fig. 17. Edge or oral view. Fig. 18. Dorsal (edge) 



view. X 45. 

 19-23. Discorhina polystomeUoides Parker & Jones. Fig. 19. Superior view. 



Fig. 20. Inferior view. Fig. 21. Edge view, showing the double 



system of aperture. Figs. 22, 23. Diagrammatic optical sections. 



Fig. 22 from the superior and 23 from the inferior side, (The 



principal series of chambers is shown in outline, and the secondary 



series in shading.) X. 45. 

 24-26. Discorhina pnstulata Heron-Allen & Earland. Figs. 24, 25. Superior 



views. Fig. 26. Inferior view. X 120. 

 27-31. Discorhina glohosa (Sidebottom). Fig. 27. Side view. Figs. 28, 29. 



Apical view. Figs. 30, 31. Basal view. X 98. 

 32. Discorhina patelliformis Brady. Paired or " budded " shells, viewed as 



a transparent object in balsam. X 130. 

 33-36. Trimcatulina rodrata Brady. Fig. 33. Young specimen, oblique view. 



Figs. 34, 35. Adult specimens, side view. Fig. 36. Edge or oral view. 



X 33. 

 37-40. Trnncatulina tuhulifera, sp. n. Fig. 37. Superior view, specimen 



mounted in balsam. Fig. 38. Superior view, opaque. Fig. 39. 



Inferior view. Fig. 40. Edge view. X SO. 

 41-47. Trimcatulina glahra, sp. n. Figs. 41-43. Young specimens showing 



the involute character of the test. Fig. 43. Oral view. Figs. 44-47. 



Adult forms. Fig. 47. Oral view. X 83. 



