41. Cyr. lauta Do^^hayes ? 



ex anct. (fide Cuming.) 



42. Cyr. placida Desliaycs ? 



ex anct. (fide Cuming.) 



43. Cyr. sphaerica Prime ? 



FOSSIL (TERTIARY) SPECIES FROM THE BASIN OF PARIS. 

 a. Cyrena proper. 



44. Cyr. Charpentierii Deshayes Epcrnay. 



Ennenonville. 

 ex anct. 



45. Cyr. compressa. Deshayes Mouy. 



ex anct. 



.46. Cyr. Gallieana Prime Jaignes. 



46. a. Cyr. conipta Desk Jaignes. 



ex auct. 



b. Species allied to Corbicula. 



47. Cyr. suborbicularis Desliayes Chalons-snr-VesIes. 



ex auct. 



48. Cyr. mixta Desliayes Cliaions-snr-VesIes. 



ex anct. 



49. Cyr. Graves! Desliayes Cuise-ia-Motte. 



ex anct. 



60. Cyr. veneriformis Desliayes Clialons-snr-Veslcs. 



ex auct. 



51. Cyr. amygdalina Desliayes Cuise-la-Motte. 



ex anct. 



52. Cyr. deperdita Deshayes Cnise-la-Motte. 



ex auct. 

 Sainceny. 

 ex anct. . 

 Auvei's. 

 ex auct. 

 Beanchamp. 

 ex auct. 



53. Cyr. crassa Deshayes La Ferte sous Jonarre. 



Auvers. ex anct. 



54. Cyr. breviuscula Deshayes Dameiy. 



ex auct. 



65. Cyr. pisum Deshayes Hondan. 



ex anct. 



56. Cyr. cycladiformis Deshayes Hondan, 



ex auct. 



57. Cyr. ovalina Deshayes Damery. 



ex auct. 



