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PA 88. DEL. M.V.L. R 24 8. 



Diatoms, all greatly enlarged. (pp. 113, 132, 244). 



1. Coscinodiscus excentricus. 4. Ithizosolenia styliformis. 7. Eucampia zoodiacus. 



2. Skeletoncma costatum. 5. Lauderia borealis. 8. Nitzschia closterium. 



3. C/iaetoceros currnsetus. 6. BiddulpJiia mobiliensis. 9. Corethroncriophilum. 



10. T/ialassiosira gravidis. 



