Zoological Societij. 225 



In conclusion, Mr. Garner submits the subjoined tabular view 

 of an 



Anatomical Classification of the Lamellibeanchiate Conchi- 

 FEROus Animals. 

 With but one adductor muscle. Monomyaria, Lam. 

 Tentacles verj^ long, not distinct from the bran- 



chice ; an additional muscular system Anomia. 



Tentacles short, separate from the branchia. 



No foot Ostrea. 



A foot. 



Branchia disunited medianly. 



Foot long, cylindrical ; ocelli at the edge 



of the mantle Pecten. 



Foot short, thick, with a disk at the ex- 

 tremity, from the centre of which 

 depends a pedicellated oval body ; 



ocelli Spondylus. 



Foot compressed ; no ocelli Lima. 



BranchicE conjoined medianly Vulsella.* 



With two adductor muscles. Dimyaria, Lam. 

 Mantle without separate orifices or tubes. 



Foot slender, byssiferous ; tentacles fixed . . Avicula.* 



Foot thick, rounded, with a callosity Area. 



Foot compressed, securiform Pectunculus. 



Foot oval below, its margin tentacular, ten- 

 tacles volute Nucula. 



Foot large, pointed anteriorly, bent at an 



angle Trigonia.*' 



Mantle with a distinct anal orifice. 

 Foot small, byssiferous. 



Anterior muscle small ; retractile muscles 

 of the foot numerous ; byssus large. 



Byssus divided to its base Mytilus. 



Byssus with a common corneous cen- 

 tre Modiola. 



Anus furnished with a long ligulate 



valve Pinna.* 



Muscles equal ; two pairs of retractile 



muscles only ; byssus rudimentary .... Lithodomus. 

 Foot large, not byssiferous Unio. 



Mantle with a superior and inferior orifice ; not 

 elongated into tubes. 



Mantle widely open Cardium. 



Mantle closed around the foot or byssus. 

 Foot short and discal, byssiferous ; an- 

 terior muscle small Tridacna.* 



Foot small, cylindrical, bent at an angle; 



lips fohated C'hama.* 



Foot small, sharp ; lips simple Isocardia.* 



Third Series. Vol. 9. No. 53. Sept. 1836. 2 C 



