After looking at almost 50 pictures of conchs and shells. I finally found it!

Since your first conch doesn't seem to be quite complete, it's roughly identified as a purple-sleeved phoenix conch 。。。。 Pictured above

The second is the Witch Bone Snail. It has spines all over its body and has a prickly appearance. Above

The third species is the Black Star Treasure Snail. The shell surface is smooth and glossy, the back of the shell to the periphery of the white to light brown as the base, adorned with a number of different sizes of black-brown spots, hence the name Black Star 。。。。. On the picture

Classmates 。。。。 I'm not sure if it's easy for me. By the way, in the process of looking at the picture, found a very beautiful shell, share it with you! Chicken heart clam? : Translucent, delicate double shells kissing together in a typical heart shape. Above