EXPLANATION OF PLATE XIX. 



Hi/nlonema lainella. F. E. Sell. 



Fig. 1. Fragment of a specimen, probably a pa-rt of the upper margin 

 of the calyx. Nat!, size. 



Fig. 2. Arrangement of the spicules in a transverse section of the upper 

 margin, vertical to the surface. x .50 (combined figure). 



Fig. 3. Macramphidisc. x oOO. 



Fig. 4. Micramphidisc. x 300. 



Figs. 5-7. Mesamphidisc. x 300. 



Fig. 8. Parenchymal oxyhexactine. x 300. 



Fig. 9. Dermal pinule. x 300. 



Fig. 10. Gastral pinule. x 300. 



