PLATE 124. 



CONCHARIDA. 



Fig. 1 



Conchidium terebratula, n. sp., 

 Lateral view, from the left side. 



Fig. 2. Conchidium terebratula, n. sp., 



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

 into one another. 



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

 Lateral view, from the left side. 



Conchidium leptcena, n. sp., 



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



Fig. 4. 



Fig. 5. Conchidium leptcena, n. sp., 



Fig. 6 



A single tooth with its base. 



Fig- 



7 



Fig. 



8 



Fig. 



9 



Fig. 10. 



Fig. 11. 



Fig. 12. 



Fig. 13. 



Fig. 14. 



Fig. 15. 



Fig. 16. 



Conchidium thecidium, n. sp., 



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

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

 nuclei (a dorsal and a ventral). 



Conchidium argiope, n. sp., 



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



Conchidium argiope, n. sp., . . ... 



Dorsal valve, from below. 



Conchidium argiope, n. sp., . 



A piece of the valve margin, with four teeth. 



Conchonia diodon, n. sp., ..... 



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



the dark phseodium, 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). 



Conchonia diodon, n. sp., . 



Mouth of the shell, with its two lips, seen from the 



Conchonia diodon, n. sp., 



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



Conchonia triodon, n. sp., . 



Ventral valve, seen from the lower face. 



Conchonia triodon, n. sp., . 

 Dorsal valve, seen from the left side. 



Conchoceras caudatum, n. sp., 

 Lateral view, from the left side. 



Conchoceras cornutum, n. sp., 

 Lateral view, from the left side. 



oral pole. 



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