PLATE IV. 



Forocidaria Sharreii A. As. 



Fig. 1. Portion of test of specimen measuring nearly three inches in diameter. Seen in profile. 

 Fig. 2. Abactinal system of same, both figures somewhat enlarged. 



3-23. Salenia Pattersoni A. Ag. 



Fig. 3. Abactinal system of specimen IS mm. in diameter, 



Fig. 4. Actinal system of same. 



Fig. 5. Portion of test of same, seen in profile, showing primary coronal plates above ambitus, facing 



the median interambulacral line. 

 Fig. 6. Portion of teal "t Banie above the ambitus, seen in profile faring the median ambulacra] line. 

 Fig. 7. Portion, oi ambulacral area of same, showing tin- Eemicidaxis-like arrangement of the tubercles 



at the base of the ambulacral area near the actinostome. 

 Fig. 8. Primary spine of same. Natural size. 

 Pig. 0-11. Ambulacral papilla' of same, magnified. 



Fig. 12-14. Poi -]' ambulacral spines, near actinostome, magnified. 



i Test of specimen 1- mm. in diameter, seen from the abactinal side. 



Fig. 10. Portion of test of same, below and at ambitus, seen in profile, facing the median ambulacral line 



and showing the ffemicidaris-like ambulacral tubercles. 

 Fig. 17. Actinal system of same. 



i "('specimen 10 mm. in dial" 

 Fig. 1!). Actinal system of same. 



Fig. 20. Portion of test of same, above ambitus, sei pn fill . faring the median interambulacral line. 



Fig. 21. Portion of test of same, below and at ambitus, seen facing the median ambulacra] line, to show 



tin- Hemicidaris-like arrangement of the ambulacral tubercles. 

 Fig. 22. Young Salenia 6.5 mm. in diameter, seen from the actinal side. 

 Fig. 23. Abactinal system of same. 



