NUDIBRANCHIATA OF THE L.M.B.C. DISTRICT. dit 
the systematic position of the genus Hero,* in which he 
states that the dendritic appearance of the dorsal papille 
is due to preservation in alcohol, and that these processes 
are really fusiform dorsal cirri, lke those of Lolis, 
arranged in pedunculated groups. 
On reading this paper I re-examined my specimen, which 
is well preserved, and also my drawings made from the 
living animal at Lamlash, and I can only say that my 
published figures (Proc. Roy. Phys. Soc., Edin., vol. vi., 
pl.1., figs. 4, 5) represent the branched cerata correctly. 
Possibly M. Vayssiere’s specimens may belong to another 
species; if not, I am at a loss to conceive how he can 
regard the dorsal papille as being pedunculated groups of 
fusiform processes. The branches do not all arise together 
at the top of a peduncle; but the main stem divides, and 
then the branches sub-divide some three or four or five 
times in the various papille in my specimen,+ so that the 
structure produced is a distinctly dendritic one; and, 
moreover, this condition is not the effect of contraction, 
but is as distinct or even more distinct in the living animal 
than in preserved specimens. 
* Comptes rendus, cvii., p. 136, July 9, 1888, 
t See also Bergh’s figures (loc. cit. pl. xix., figs. 9 and 10). 
