PLATE III. 



Figs. 1-3. Archieonehoecia striata. 



1. Shell of male. X 94. 



2. Frontal organ of male. X 360. 



3. Secondary branch of male antenna. X 360. 



Figs. 4-7. ConehoEcia spinirostris. 



4. Shell of female. X 51. 



.5. Anteunule of male. X 210. 



6. Frontal organ of male. X 210. 



7. Secondary branch of right male antenna. X 210. 



Figs. 8-11. Condioecia magna. 



8. Shell markings sho\Aiiig branching and anastomosing of 



striae. X 150. 



9. Frontal organ of female. X 85. 



10. Secondary liranch of right male antenna. X 145. 



11. Secondary branch of left male antenna. X 145. 



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