PLATE 124. 



CONCHAEIDA. 



Diam. Page 



Fig. I. Conchidium terebratula, n. sp., . . . x 400 1721 



Lateral view, from the left side. 



Fig. 2. Conchidium terebratula, n. sp., . . . . x 800 1721 



A piece of the frontal girdle-fissure, with the teeth of both valves catching 

 into one another. 



Fig. 3. Conchidium rhynchonella, n. sp., . . . .x200 1722 



Lateral view, from the left side. 



Fig. 4. Conchidium leptcena, n. sp., . . . x 300 1722 



Girdle-fissure with the teeth, seen from the left side. 



Fig. 5. Conchidium leptcena, n. sp., . . . . x 800 1722 



A single tooth with its base. 



Fig. 6. Conchidium thecidium, n. sp., . . . . x 300 1721 



Lateral view, from the left side. In the oral part of the shell-cavity the 

 dark phaeodium, in the aboral part the central capsule with two 

 nuclei (a dorsal and a ventral). 



Fig. 7. Conchidium argiope, n. sp., . . . x 300 1722 



Oblique oral view (half from the anterior, half from the left side). 



Fig. 8. Conchidium argiope, n. sp., . . . . x 300 1722 



Dorsal valve, from below. 



Fig. 9. Conchidium argiope, n. sp., . . . . x 600 1722 



A piece of the valve margin, with four teeth. 



Fig. 10. Conchonia diodon, n. sp., . . . . . x 200 1723 



Lateral view, from the left side. In the anterior part of the shell-cavity 

 the dark phaeodium, in the posterior part the central capsule with 

 the nucleus. The two valves are connected at the posterior hinge 

 by a ligament (to the right in the figure). 



Fig. 11. Conchonia diodon, n. sp., . . . . . x 400 1723 



Mouth of the shell, with its two lips, seen from the oral pole. 



Fig. 12. Conchonia diodon, n. sp., . . . . . x 400 1723 



A piece of the valve-margin, with four teeth. 



Fig. 13. Conchonia triodon, n. sp., . '. . . x 300 1724 



Ventral valve, seen from the lower face. 



Fig. 14. Conchonia triodon, n. sp., . . . . x 300 1724 



Dorsal valve, seen from the left side. 



Fig. 15. Conchoceras caudatum, n. sp., . . . . x 300 1727 



Lateral view, from the left side. 



Fig. 16. Conchoceras cornutum, n. sp., . . . . x 200 1728 



Lateral view, from the left side. 



