PLATE 50. 



Larcarida, Larnacida et Zonarida. 



Fig. I. Larnacilla typus, n. sp., 



From the sagittal pole (dorsal view). 



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



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



Fig. 2. Larnacalpis lentellipsis, n. sp., 

 From the sagittal pole (dorsal view). 

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

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



Fig. 3. Larnacalpis triaxonia, n. sp., 



From the sagittal pole (dorsal view). 



Fig. 4. Larnacantha hexacantha, n. sp., 

 From the sagittal pole (dorsal view). 



Fig. 5. Larnacantha bicruciata, n. sp., 

 Frontal view. 



Fig. 6. Larnacantha pyrismatica, n. sp., 

 Half frontal, half lateral view. 



Fig. 7. Cenolarcus primordialis, n. sp., 

 From the sagittal pole. 

 Fig. 7a. From the lateral pole. 

 Fig. 7 b. From the principal pole. 



Fig. 8. Larcidium dodecanthum, n. sp., 

 From the sagittal pole. 

 Fig. 8a. From the principal pole. 



Zona.rium octangulum, 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). 



Zonidium octotholium, n. sp., . 

 Frontal section (from the sagittal pole). 

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



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