27 



Cytheridea lacustris, Brady. Mon. Bee. Brit. Ost., p. 427, pi. xxvi., figs. 



18-21; and pi. xl., fig. 2. 



Not uncommon in Glasgow and Paisley Canal, west of Pollok- 

 shields, and sparingly in the Clyde, near Langbank. This species 

 is rather sluggish, mostly stationary on the mud, or partly embedded 

 in it, with the valves partially open, apparently satisfying itself 

 with what the movement of the water may bring in its way. 



Cytheridea torosa, Jones. 



Gandona torosa, Joues. Ann. and Mag. Nat. Hist., ser. ii., vol. vi., p. 27, 



pi. hi., fig. 6. 

 Cyprideis torosa, Jones. Mon. Ter. Ent., p. 21, pi. ii., figs, la-li. ; and 



woodcut, fig. 2, p. 16. 

 Cytheridea torosa, Brady and Robertson. Ann. and Mag. Nat. Hist., ser. 



iv., vol. vi., p. 21, pi. viii., rigs. 6-7. 



Brady, Crosskey, and Robertson. Mon. Post-ter. Entom., 



p. 178, pi. xv., figs. 11-12. Var. teres, pi. vii., figs. 1-2. 



In brackish water, chiefly estuarine. In great abundance on 

 the banks of the Garnock on Misk Farm, near Kilwinning, in small 

 holes, a few feet wide, formed in the turf, the bottom being soft 

 mud covered by a few inches of water, and overflowed by high 

 tides. The margins of those pools are excavated for many inches 

 all round. Small eels, from three to four inches long, are common 

 in the bottom mud. 



Var. teres. — Generally in company with the above. 



The following remarks may help beginners, who generally work 

 at great disadvantage and loss of time from not knowing properly 

 when or how to collect, or how to preserve what they may have 

 collected. The latter is perhaps the greatest source of discourage- 

 ment to many, who find, after a few years' enthusiastic labour, 

 that they have only accumulated a vast amount of ill-arranged and 

 often cumbersome material, neither pleasant to look upon nor 

 useful to consult. 



In this, as in all other branches of Natural History, it is 

 absolutely necessary (1) to have the locality affixed to every 

 specimen intended for preservation. To do this is within the 

 reach of every one who collects for himself. If it is neglected to be 

 done at the time of collection, it may be impossible to do it with 

 any certainty afterwards. (2) The next important point is to 



