PREFACE. 
VIII 
with those of warmer climates ; yet the lina e ' 
stone of Devon and the slate rocks of Cornwall 
contain the remains of specimens, which f° l 
size and beauty might have vied with any n°'^ 
existing. Though the Cornish species are snaa"’ 
yet many of them are exceedingly elegant, a» ( 
J J ... rfo 
seem peculiarly fitted to invite attention. 
myself the investigation it has been rather tl ,e 
amusement of leisure hours and pleasurabl e 
excursions on the water, than a study ; had 
however, been otherwise the pleasure deriv e 
from it would more than have compensated f° 
any difficulties that could have occurred. ™ 
has been a source of health, innocent amus e 
ment and pleasure, and will be so to all 
study nature where she is to be found ; abrO» 
rather than in the closet. As Cornwall, fro 111 
fit* 
its form has a very great extent of sea co» s 
some species have probably escaped detectio * 1 j, 
ill 
bt 
b e 
or difficulty, I shall esteem it a favour to 
allowed to inspect such specimens, as well 
my own, as for the benefit of others. 
but as it is to be hoped that the number 
observers will now be increased, these 
soon be found, and where there is any do« 
Penzance, August, 1844. 
