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![](https://static.wixstatic.com/media/04fdd9_8d2d389c80324413956bcdc79b3e90fd~mv2.jpg/v1/fill/w_600,h_174,al_c,q_80,usm_0.66_1.00_0.01,enc_auto/04fdd9_8d2d389c80324413956bcdc79b3e90fd~mv2.jpg)
Illustrations of Shell Features
Bivales
Lunule
Unread postMay 21, 2009#1
Lunule - A impression (often heart-shaped) on the external side of the hinge anterior to the beaks.
![ligament 1.jpg](https://static.wixstatic.com/media/04fdd9_0318cdc6e9124612804501f8118bfa86~mv2.jpg/v1/fill/w_890,h_640,al_c,q_85,usm_0.66_1.00_0.01,enc_auto/ligament%201.jpg)
![lunule 2.jpg](https://static.wixstatic.com/media/04fdd9_fbfd1c10bc2f4dac8321e8acf8c64871~mv2.jpg/v1/fill/w_884,h_630,al_c,q_85,usm_0.66_1.00_0.01,enc_auto/lunule%202.jpg)
![lunule 3.jpg](https://static.wixstatic.com/media/04fdd9_cf513ba73c8848c3aabf30980c244dac~mv2.jpg/v1/fill/w_159,h_126,al_c,q_80,usm_0.66_1.00_0.01,blur_2,enc_auto/lunule%203.jpg)
![lunule 4.jpg](https://static.wixstatic.com/media/04fdd9_162084e13e54428f8c2cc09e62a4ec01~mv2.jpg/v1/fill/w_159,h_114,al_c,q_80,usm_0.66_1.00_0.01,blur_2,enc_auto/lunule%204.jpg)
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Illustrations of Shell Features
Bivales
Lunule
Unread postMay 21, 2009#1
Lunule - A impression (often heart-shaped) on the external side of the hinge anterior to the beaks.