15 



28 Cardium Punctulatum p. 

 136 



— Subretusum p. 144 



P- 



29 

 SO 



31 



32 

 33 

 34 

 35 

 36 



37 

 38 

 39 



40 

 41 



42 

 43 

 44 

 45 

 46 

 47 



48 



49 



Subelongatum 



138 



— Foveolatum p. 138 



— Monstrosum p. 143 



— Attenuatum p. 140 



— Maculatum p. 139 



— Unicolor p. 138 



— Glaucum of Bru- 



guiere afp. 



Australe p. 135 



Caspium app. 



Punctatum of Re- 



men app. 



Elenense p. 141 



Enode p. 139 



Imbricatum p. 143 



Scabrum app 



Nodosum p. 136 



Ovale p. 136 



Hystrix app. 



Exasperatum p. 



137 



144 



Planicostatum p. 

 Fornicatum p. 143 



50 



Tumoriferum 



142 



51- 

 52 

 53 

 54 

 55 



Fragile p. 141 



Variegatump. 138 



Impolitum p. 138 



Deshayesii app. 



Muticum app. 



56*Cardita Cuvierii p. 146 



57 Tumida p. 146 



58 Crassa p. 145 



59 Australis (Veneri- 



cardia A) of Quoy;=? 

 Tridentata of Say app. 



Laticostata var. p. 



60 



146 



PLATE XVIII. 



1 Cardita Abyssicola app. 



Antiquata of Lin- 

 naeus. (Sulcata p. 144) 



Ajar p. 144 



Borealis p. 145 



Canaliculata app. 



Corbis app. 



Calyculata p. 147 



— Radiata p. 148 



* The Venericardia Crassicostata of the Tankerville Catalogue, 

 appears from the original specimen, (now in the National Museum) 

 to be a variety of this species ; nor do I perceive much difference 

 in the C. Michelini of Valenciennes in the Voyage de la Venus. 



