marine British Shells and Animals. 197 
well as papillosa and some other of the Linnzan Dorides,) has 
been removed and formed into a new genus, and is described 
by Bosc under the title of Tritonia. The Phyllidium of Cuvier ap- 
pears to be formed from another division of Doris: and the Scy/- 
lea, which was constituted by Linnsus, does not appear to be at 
greater variance with some of the animals placed under the title 
of Doris, than many species of Doris are with each other. 
It must be admitted that Linnæus, and after him many other 
able naturalists, placed in the genus Doris many animals wanting 
the leading characters which should constitute them of the same 
family ; we need only refer to the multivalve shell Chiton, which 
that great naturalist says is inhabited by a Doris, to prove how 
incongruous are some of the species of the same genus; and yet 
how implicitly have succeeding writers continued these errors ! 
The two following animals, according to the more modern 
system, will appear to belong to Tritonia; or perhaps one of them 
is so nearly allied to Scyllea as to create some difficulty to deter- : 
mine in which of tliose genera it ought to be placed. In the pre- 
sent instance I shall continue them in the genus in which I had 
originally placed them, amongst the fasciculate species of Doris, 
as belonging to the same family I had the honour of laying be- 
fore the Linnean Society upon a former occasion, and reserve 
a. different arrangement for future consideration. 
 Donis PEDATA. 
Tas. XIV. Fig... 
Body long, slender, and acuminated behind ; the front rounded: 
tentacula four, large, subclavated and wrinkled ; two are situated 
in front rather projecting forwards; the others stand nearly erect 
at a little distance behind: papille or eirri on the back nume- 
rous, long, and subclavated when contracted, but nearly filiform 
202 when 
