PLATE 123. 



CONCHAEIDA. 

 (The central capsule is coloured red in the figures of this plate, the phseodium green). 



Diam. Page 



Fig. 1. Concharium diatomeum, n. sp., . . . . x 1717 



Dorsal view. The central capsule (red) exhibits above the anterior 

 tubular main-opening (astropyle), and below the two small posterior 

 lateral openings (right and left parapylae). 



Fig. 2. Concharium bivalvum, n. sp., . . . x 150 1717 



Dorsal view. The central capsule is visible in the lower part, the margin 



of the two valves in the upper part of the figure. 

 Fig. 2a exhibits the two smooth lateral margins of the valves, catching 



into one another. (Lateral view). 



Fig. 3. Concharium nucula, n. sp., . . . . . x 1717 



The dorsal valve alone, seen from the outside. 



Fig. 4. Concharium bacillarium, n. sp., . . . . x 1718 



Lateral view from the smooth margin, by which the two valves are united. 



Fig. 5. Conchasma radiolites, n. sp., . . . x 300 1719 



Lateral view. In the aboral half of the shell-cavity lies the red central 

 capsule, in the oral half the green phseodium. 



Fig. 6. Conchasma sphcerulites, n. sp., . . . x 300 1719 



Lateral view. On the aboral pole the two horns of the hinge. 



Fig. 7. Conchellium tridacna, n. sp., . . . x 200 1720 



Oblique lateral view (from the right and ventral side). 



Fig. la. Three pores of the same, with their hexagonal frames and 



six internal denticles, . . . x 400 



Fig. 8. Conchopsis carinata, n. sp., . . . .x!50 1725 



Lateral view, from the left side. 



Fig. 9. Conchopsis lenticula, n. sp., . . . x 150 1726 



Lateral view, from the right side. The two membranes of the central 

 capsule are separated by a wide interval in this and the preceding 

 figure. The nucleus contains numerous nucleoli. 



Fig. 9o. Two of the peculiar cells, which are contained in the green 



phseodium in large numbers, . x 400 



