found on the South Coast of Devonshire. 63 
In this class there are many which seem to vie with each other 
to astonish the beholder, by the superabundant beauty that seems 
to be thrown away in the fathomless deep, where, doubtless, 
thousands of their congenera will ever remain in secret, and never 
come under the scrutinizing eye of the naturalist. 
Amongst this tribe, I trust, one species of Laplysia may be 
added to the very few belonging to that genus ; for although it 
does not exactly correspond with all the Linnaean characters, yet 
it cannot with equal propriety be placed elsewhere. 
Of the Doris, figures of five species are given, some of which 
are certainly new ; the others, of which doubts may be enter- 
tained, have either never been described as English, or no cor- 
rect figures of them have ever come to my knowledge. 
The genus Amphitrite might possibly afford more than one new 
species ; but, as many of these animals inhabit Testacea and Sub- 
testacea (if the expression may be allowed), the Sabella, this may 
be considered, with the Nereis and Terebella, as broken genera ; 
for certainly the animals and their cases, or tubes, should go toge- 
ther, and not have different places allotted to them in the system 
of nature. 
If, therefore, the genus Sabella ; s admissible in the order Tes- 
tacea, its several animal inhabitants, like those of real shells, 
would become a secondary consideration, and serve only as marks 
of specific distinction. But in this case, that genus should be 
pruned of all the parasitical branches that have been intruded 
upon it without reason ; I mean the numerous cases of the larvre 
of subaquatic insects, or those of the Neuroptera order, such as 
Fhryganea and Ephemera produced in the fresh waters of Thu- 
ringia, and equally plentiful in England. 
The figure of one species only is herewith given, and it 
appears to be new; at least no books in my own library, or 
those 
