CONCHOLOGY. 
PHOLAS., 
Shell with two larger primary valves, open at 
both ends, and several lesser ones about the hinge: 
teeth long, curving inwards, one ia each vaive on 
the inside, 
. Pholas papyracea. Turton, pl. 1. fig. 1. 4. 
. Ph. lamellata. Turton, pl. 1. fig. 5. 6. 
. Ph. tuberculata. Turion, pl. 1 fig. 7. 8. 
. Pi. dactylus, Brit. Zool, pl. 42. fig. 1.— 
Donovan, pl. 118. 
&. Ph. candida. Brit. Zool. pl, 42. fig. 2.— 
Donovan, pl. 132. 
6. Ph. parva. Brit. Zool. pl. 4. fig. 1.— 
Montague, pl. 1. fig. 7. 8. 
All these are found at low water, burrowed in 
tlay, sand, decayed wood, or sandstone rocks. 
wm CO bl 
B. With two valves, 
- MYA, 
Shell generally gaping at one end: hinge with 
mostly a strong thick broad tooth, not inserted into 
the opposite valve. 
1, Mya truncata. Brit. Zool. pl. 44.—Dono. 
van, pl, 92, 
2. M.arenaria. Brit. Zool. pl. 45.—Donovan, 
pl. 85. 
3. M. declivis. Pultney’s History of Dorset« 
shire, pl. 4. fig. 6, 
