22 



Notes on other species of MELQSIRA : 



2b Frustules not usually united into long filaments; 

 usually solitary but may form short chains 



3a Frustules with intercalary bands; usually seen in 



girdle view; one or two long spines arising from each 

 valve 



3b 



Frustules without intercalary bands, 



One long spine arising from each valve - RHIZOSOLENIA 



Fig. 9. Rhizosolenia eriensis, (k) , cells 5-15u in diameter, 

 40-150u long; note the many intercalary bands in the 

 girdle area. X 1000. Common in the Great Lakes. 



girdle view 



Notes : 



intercalary band 



