closing membrane
A B C D E F G H I J K L M N O P Q R S T U V W Y Z

the membrane formed at the posterior of the teleoconch when the protoconch is thrown off.

Alternative form for closing membrane : closing membranes.

thecosomata_1.jpg

thecosomata_1.jpg

thecosomata_3.jpg

thecosomata_3.jpg