420 Notes on the Classification of the Corbiculadm, etc. 



Deshayes, however, in his edition of Lamarck, says that the 

 Cyrena oblonga, Qnoy, from the Islands of the Pacific, has a 

 sinns. Not having met with this species, I can give no opinion. 

 The accompanying figures of Cyrena fortis, from Ecuador, and 

 of Cyrena triangularis, from Borneo, illustrate my meaning. 



Fio. 2. 



Cyrena triangularis, from Borneo. 



What I have said of Cyrena, holds good likewise of the genus 

 Corbicula. The American species of Corbicula have a sinus, 



Fig. 4. 



Fio. 8. 



Corbicula obsoleta, from South America. 



Corbicula Larsrillierti. from China. 



