142 
An Ostrea adheres to it, which, although pretty perfect, 
does not show its characters sufficiently to be figured other- 
wise than as a companion to the Fusus. 
Miss Codrington has a fine specimen from Muddiford, 
in which the knobs are numerous and large; while I have 
fragments of various sizes in which there are scarcely any 
protuberances, thus constituting two varieties, which might 
lead to error, did not some specimens exhibit both in one 
shell. 
There are shells from France, which often find a place in 
English Cabinets, and are perhaps this species; they are 
very delicately preserved, and show the strie of growth 
in thready appearances, which are more or less decussated 
by transverse rising ridges from the first even to the last 
whorl. I do not know that this species, so frequent in 
Hampshire, has been found in the Highgate Clay. 
