PLATE 124. 



Fig. 



1. 



Fig. 



2 



Fig. 



3. 



Fig. 



4 



Fig. 



5 



Fig. 



6 



Fig. 7. 

 Fig. 8. 

 Fig. 9. 

 Fig. 10. 



Fig. 11. 

 Fig. 12. 

 Fig. 13. 

 Fig. 14. 

 Fig. 15. 

 Fig. 16. 



CoNCHARIDA. 



Conchidium terebratula, n. sp., 



Lateral view, from the left side. 



Conchidium terebratula, n. sp., 



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

 into one another. 



Conchidium rhynchonella, n. sp., .... 

 Lateral view, from the left side. 



Conchidium leptcena, n. sp., 



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



Conchidium leptcena, n. sp., 

 A single tooth with its base. 



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 oral pole. 



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. 



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