Please have a look at these links and PDF attachments.

http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2818.1982.tb00452.x/abstract

http://www.microscopemaster.com/microscope-slides.html

Dear Ahmed,

I'm using for such purposes the hanging drop. Look this URL

http://plantnet.rbgsyd.nsw.gov.au/PlantNet/fwalgae/Introduction/observe.htm

As well I'm attaching the MARYANN FOOT article that recommend Arvind as you may be have no access to full version as review is necessary.

Look as well p.298-300 from the book A TEXTBOOK OF ALGAE of Sambamurty from 2005

(Attach for you).

Good luck

Andrey

Please find the attached PDF.