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PHOTOMICROGRAPHS OF DIATOMS. 



Fig. 1. Triceratium picturatum, Greville, Barbadoes. 



2. Aulacodiscus Thumii, A, Schmidt, Eedondo, Oal. 



3. Triceratium nitescens, Greville, Oamaru, N. Z. 



4. Aulacodiscus notatus, Grove & Sturt, Oamaru, N. Z. 



5. Lepidodiscus elegans, Witt, Sysran, Eussia. 



6. Actinoptychus Adamans, Brun, Barbadoes. 



7. Triceratium Febigerii, Walker & Chase, Barbadoes. 



8. Triceratium Wittianum, Truan, Jeremie, Hayti. 



D. B. WARD, M. D., POUGHKEEPSIE, N. Y. 



CORHELIHS V*N RfflJNT, 319 E. 57th St., *. V; 



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