STUDIES ON THE MORPHOLOGY OF SHELL OF LAMPROTULA FIBROSA IN WANGHU LAKE

Studies on the morphology of shell of 1368 Lamprotula fibrosa Heude in Wang Hu lake showed: The number of the front littie spines or the signs of the spines is 3 to 5 and 4 is the most among them. As for the behind one, it is 1 to 4 and 2 is the most among them. The equahon of linear regression between shell length (L) and shell thickness (T) is L = 7.2406T+ 2.4392. The Periostracum is thinnest, the prismatic layer is thicker than the periostracum and while the pearl layer is the thickest in three layer structure of the shell. The colour of the periostracum is brown or blue-black, the prismatic layer is yellow-brown and the pearl layer is clear and bright. The growth rings of L. fibrosa clearly appear on the prismatic layer and the pearl layer. As far as the female L. fibrosa is concemed, the costal ridges of the back of the exterior near the top of shell look slim and delicate and the colour of the back and rear of the prismatic layer looks yellos-brown. As so as male L. fibrosa is goes, the costal ridges of on the whole back look thick and strong and the colour of the back and rear of trhe prismatic layer looks red or red-brown.