CONTENTS OF VOL IV 



PAGE 



ADDITIONAL BIBLIOGRAPHY xi 

 FAMILY DESMIDIACE.?;. 



SUB-FAMILY II. PLACODERM^. 

 TRIBE 5. COSMARI.E. 



GENUS 15. COSMARIUM (concluded) . 1 



,, 16. XANTHIDIUM . .48 



,, 17. ARTHRODESMUS . . 88 



18. STAURASTRUM , 118 



f 



