PLATE 50. 



Fig. 1. 



Fig. 2. 



Fig. 3. 



Fig. 4. 



Fig. 5. 



Fig. 6. 



Fig. 7. 



Fig. 8. 



Fig. 9. 

 Fig. 10. 

 Fig. 11. 



Larcarida, Larnacida et Zonartda. 



Larnacilla typus, n. sp., 



From the sagittal pole (dorsal view). 



Fig. la. From the lateral pole (sagittal section). 



Fig. lb. From the principal pole (equatorial section). 



Lamacalpis lentellipsis, n. sp., 



From the sagittal pole (dorsal view). 



Fig. 2a. From the lateral pole (sagittal section). 



Fig. 2b. From the principal pole (equatorial section). 



Lamacalpis triaxonia, n. sp., 

 From the sagittal pole (dorsal view). 



Larnacantha hexacantha, n. sp., 

 From the sagittal pole (dorsal view). 



Larnacantha bicruciata, n. sp.. 

 Frontal view. 



Larnacantha prismatica, n. sp., 



Half frontal, half lateral view. 



Cenolarcus primordialis, n. sp., 

 From the sagittal pole. 

 Fig. la. From the lateral pole. 

 Fig. 7 b. From the principal pole. 



Larcidium dodecanthum, n. sp., 



From the sagittal pole. 



Fig. 8a. From the principal pole. 



Zonarium octanguhirn, n. sp., 

 Frontal view. 



Zoniscus tetracanthus, n. sp., . 

 Frontal view. 



Zoniscus hexatholius, n. sp., . 



Dorsal view (from the sagittal pole). 



Fig. 11a. Lateral view (from the frontal pole). 



Fig. 12. Zonidiurn octotholium, n. sp., . 



Frontal section (from the sagittal pole). 



Fig. 12a. Lateral view (from the frontal pole). 



Diam. 

 X 300 



x 400 

 x 400 

 x 300 



x 300 



x 400 



Page 

 617 



x 400 620 



621 



622 



623 



x 300 623 



x 300 607 



x 300 612 



x 300 685 



687 

 687 



x 300 688 



