PLATE IV. 



Figs. 1, 2. Conchoecia magna. 



1. Shell of male. X 38. 



2. Claiulal laiiiiiia and male organ. X 73. 



Figs. 3, 4. Conchoecia hyaloi)]iyUum. 



3. Shell of female. X 40. 



4. Antenuule and frontal organ of female. X 73. 



Figs. 5-7. Conchoecia i)acifica. 



5. Frontal organ of female. X 73. 



6. Frontal organ of male. X 82. 



7. Secondary In-anch of right male antenna. X 112. 



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