ADDENDA ET CORRIGENDA. #509 
Page 462. GaArmArpIA TRAPESINA. In Mr. Gray’s Synopsis of the 
Genera of Shells in the British Museum (1840), he indicates the genus 
Modiolarea without description, naming this shell as the type, asso- 
ciating it with Crenella to form the family Crenellidx. Subsequent 
comparison showed it to be incompatible with this arrangement, 
which led Mr. Gray to give, in the Proceedings of the Zoological 
Society for April 1854, the anatomical characters of the animal, and 
to institute the family Modiolarcadx. In a note to this description 
he alludes to the description previously made in this volume, which is 
in fact much more in detail than his own. Whether, with this mere 
indication of a name for the genus, without any specified characters, 
and its erroneous association, his name is to obtain, instead of that in 
which the anatomical characters were first given, I must leave to the 
candor of conchologists at large. 
Page 464. Osrrea piscomEa. By some chance a wrong shell seems 
to have been figured at 578. 
