HINTS FOR COLLECTING. 229 



As in the last volume, I will distinguish the species 

 enumerated in the foregoing Table. Northern and 

 southern 36, peculiarly northern 53, peculiarly southern 

 8, hitherto unnoticed beyond our isles and seas 61, 

 fossil (northern 5, southern 1, common to both divi- 

 sions 6, not yet found elsewhere as recent 1) 13. 



The total number of British Mollusca described in 

 this work is 686, viz. 124 Land and Freshwater (Con- 

 chifera 15, Gastropoda 109), and 562 Marine (Brachio- 

 poda 6, Conchifera 171, Solenoconchia 5, Gastropoda 

 366, Pteropoda 2, and Cephalopoda 12) ; a few more 

 are doubtful. 



The subject, however, is far from being exhausted, in 

 many points of view; and when our knowledge of it 

 has become more extended, we must continually say 

 with Seneca, " Multum egerunt, qui ante nos fuerunt, 

 sed non peregerunt. Multum adhuc restat operis, mul- 

 tumque restabit ; nee ulli, nato post mille ssecula, prse- 

 cluditur occasio aliquid adhuc adjiciendi." 



' ' Enough, if something from our hands have power 

 To live, and act, and serve the future hour." 



HINTS FOR COLLECTING. 



LAND MOLLUSCA are found in woods, hedges, gardens, 

 and meadows, on rocks (especially those which are cal- 

 careous), old walls, dry grassy plains, and trunks of 

 trees, at the roots of grass, among fallen leaves, moss, 

 and herbage of every kind, by the sides of lakes and 

 ponds, and under logs of wood and stones. Rainy or 

 moist weather in the summer and autumn is the best 

 time for finding them. Testacella and Achatina are 

 subterraneous ; the former can be discovered by digging 

 in suitable places (see Vol. I. p. 144), and the latter in 



