43 
3. Pedum. 
Foot elongate, cylindrical, without any byssal groove, end rounded, 
subclavate. 
1. P. Spondyloideum, t. 374. f. 1, 2. 
Fam. 8. Limadee. 
Foot compressed, not byssiferous. Mantle with the inner margin 
greatly indexed, making a kind of bag; the outer circumference 
without any ocelli. Shell gaping. Hinge toothless. 
1. Lima. 
1. L. tenera, t. 3 77* f. 1. 
2. L. inflata, t. 375. f. 2, 6, t. 3 77- f. 2. 
3. L. glacialis, t. 375. f. 1, 5. 
4. L. Quoyi, t. 3 75. f. 3. 
B. Ostracea. Foot none. Body forming a single central mass. 
Vent medial, free. Tentacles separate from the gills. 
Fam. 9. Ostreidce. 
Gills united together and to the inner surface of the mantle. 
Tentacles short. Shell attached by the outer surface of one valve. 
Hinge toothless or denticulated. 
1. OsTREA. 
1. O. edulis, t. 378. f. 1, 2, t. 378 a. f. 1, 2. 
Fam. 10. Plicatulidce. 
Gills free behind, and free from the mantle, suspended from the 
body by a membrane. Lips four, rather small, united together 
above the rather large mouth. Shell attached by one of its valves. 
Hinge with two diverging, cross-grooved, cardinal teeth. Cartilage 
in a pit between the base of the teeth. 
1. Plicatula. 
C. Anomiacea. Foot distinct, small, truncated at the end. Ovaries 
separated from the mass of the body, and attached to the inner 
surface of the right lobe of the mantle. Vent nearer to or 
attached to the right lobe of the mantle. Gills united together 
behind, suspended by membranes to the inner surface of the 
mantle. 
Fam. 11. Anomiadce. 
Animal attached, rather distorted. Foot on the right side of the 
body, with a very large byssal pore at the base. Byssus horny or 
stony, formed of parallel laminae emitted through a notch in the 
front side of the apex of the right valve of the shell. Pedal muscle 
large, leaving two or three large scars on the disk of the left valve. 
The byssus or plug is placed in exactly the same situation in the 
animal as the beard or byssus of Mytilus and Pinna, &c., and the 
animal is only rather distorted by being more closely attached to 
marine bodies than in the other genera. 
1. Anomia. 
1. A. epliippium, t. 381. f. 8, 8 a, 10, 11, 12 (figs. 25, 26 & 27). 
