1916.] NATURAL SCIENCES OK PHILADELPHIA. 171 



Explanation- of Plates XXIII and XXIV. 



Plate XXIII.— Fig. 1. — Mataxa elegans gen. el sp. nov. Rear view, x 2. 



Fig. 2. — Same. Apertural view. X 2. 



Fig. 3. — Same. Apical view. X 10. 



Fig. 4. — Tectaplica simplica gen. el sp. nov. Apertural view. Nat. Bize. 



Fig. 5. — Drillulii communis gen. el sp. nov. Apertural view. Nat. size. 



Fig. 6. — Same. Rear view. Nat. size. 



Fig. 7. — DrilhUa major gen. el sp. nov. Rear view. Nat. size. 



Fig. 8. — Same. Apertural view. Nat. size. 



Fig. 9. — Fusus substriatus sp. nov. Apertural view. X 2. 



Fig. 10. — Same. Hear view. XlJ. 



Fig. 11. — Same. Apical view. X 10. 



Plate XXIV. — Fig. 1. — Ornopsis glenni now. e1 sp. nov. Apertural view. Nat 

 size*- 

 Fig. 2. — Ornopsis elerata gen. et sp. nov. Apertural view. X 1£. 

 Fig. 3. — Same. Rear view. X 1£. 



Fig. 4. — Hydrolribuliis nodosus gen. et sp. nov. Apertural view. Nat. size. 

 Fig. 5. — Same. Rear view. Nat. size. 



I .%. 6. — Urceolabrum tuberculatum gen. et sp. nov. Apertural view. X 0. 

 Fig. 7.— Same. Rear view. X 0. 



Fig. 8. — Schizobasis depressa gen. et sp. nov. Rear view. Nat. size. 

 Fig. 9. — Same. Apertural view. Nat. size. 

 Fig. 10. — Same. Basal view. Nat. size. 



Fig. 11. — Hippocampoides serratus gen. et sp. nov. Apical view. X 2. 

 Fig. 12. Same. Basal view. X 2. 

 Fie. 13. — Same. Lateral view. X 2. 



