PLATE XL. 



MYTILUS UMBILICATUS. 



VMBILICATED, OR WRY BEAK MUSCLE. 

 GENERIC CHARACTER. 



The hinge toothless, and consists of a longitudinal furrow. 



SPECIFIC CHARACTER 



AND 



SYNOfNYMS. 



Hinge much depressed and bent inwards. 



Mytilus Umbilicatus, umbilicated. Perm, Br. Zool. sp. 76. 



fig. 76. 

 Mytilus Curoirostratus. Wry Beak. Da Costa Br. Conch, 



p. 220. 50. 



We are informed by Pennant that this shell was discovered by the 

 Reverend Hugh Davies ; that it is a rare and new species, and is 

 sometimes dredged up off Priestholme Island, Anglesea. 



It is about half the size of Mytilus Modiolus, and in some respects 

 resembles it , but is distinguished by the very remarkable and peculiar 



