Thursday, 11 October 2012


1>The cypraea are commonly called as ,cowrie,.
2>It is marine gastropod found in Indian and Pacific oceans.
3>It is univalve.
4>The body having single ospharidium and kidney because of single torsion.
e,g Cowrie shells  used in indoor games,called chowpad.

Monday, 8 October 2012


1>In the13 th segment their are pair of white digitate ovaries.
2>Each ovaries is a white compact mass .
3>The ovaries present in the posterior of the septum.
3>The ovaries present in the ovarion lobes of the septum.

Sunday, 7 October 2012


It, is commonly called as, 'feather star'. It occurs in sea waters of the Atlantic, Western Africa , the mediterranean and west of Tropical America .It is an unstalked but attached crinoid, possessing a central cup-shaped disc which is covered by leathery skin. The oral surface is directed upwards.The branch dichotomously to form 10 arms and each of them bears a row of small and slender branches , called pinnules.The mouth radiate five ambulacral grooves which divide to form 10 grooves . The sides of each ambulacral groove are rows of finger like podia without suckers.The aboral surface bears numerous long, cylindrical appendages the cirri meant for gripping the substratum.