APPENDIX. 195 



Zirfcea are to be found burrowing in clay, mud, or 

 rock. Care should be taken in extracting them, as 

 the shells are fragile. If the shell be immersed in hot 

 water for a moment, the animal can be removed with 

 the help of a knife. 



SoLENiDiE, Razor- Shells, may be found burrowing 

 in the sand between tide-marks. They may be col- 

 lected and treated as above, care being taken to tie the 

 valves together, in both cases. 



Mtad^, Clams, are found both in mud and sand, 

 usually between tide-marks. They should be treated 

 as other bivalves. 



CoKBULiD^, Pandorid^, Anatinid^, Mactrad^, 

 are found either by dredging, or thrown on sandy 

 beaches. 



G-ASTROCH^NiD^ are found adhering to marine ob- 

 jects, or embedded in marsh or clay. 



Tellinid^ may be collected along sandy beaches, 

 between tide-marks. 



LuciNiD^ are inhabitants of deep water, or mud- 

 flats which are seldom left dry by the tide. 



Cycladid^ are all small, fresh-water bivalves, with 

 quite fragile shells. They should be carefully cleaned 

 and packed in cotton. 



Cyprinid^, Venerid^, Cardiad^, and Arcade, 

 are all salt-water bivalves, and are generally only to be 

 collected by dredging, often in deep water. 



Unionid^, Fresh-ivater Mussels. — These may be 

 collected in large numbers on river-bars when the 

 water is low, or by dredging in lakes or ponds. I do ;. 

 not recommend boiling them, but they should be ex- 

 posed to the sun for a short time ; then, when dead,' 

 they may be cleaned with a knife. Care should be ', 

 taken to tie the valves together. The outer surface \ 

 should be oiled slightly. 



