Occasional Notes. 185 
Part, i., June 1890, p. 37), a short descriptive 
paper on the land and fresh water Mollusca of the 
colony was published, in which a revised list of 24 
species was given, 22 of them being new to our 
fauna. Since then five other species have been added 
to the list, including four of Bulimus (B. lacerta, B. 
alternansy B. regina and B. gallina sultana) and one 
of Ampullaria urceus, Three of these are now recorded 
for the first time, Bulimus gallina sultana and Ampul- 
laria urceus, having been already recorded by Schom- 
BURGK in his " Reisen." 
It is worthy of note, though there is nothing surprising 
in the fa6l, that the common English garden snail 
(Helix aspersa), which has been introduced into so 
many different countries, has now been taken in Guiana, 
and it is likely that it will hereafter become a com- 
mon form. 
It must be noted too that the thin-shelled apple-snail, 
so common in the trenches about the town, which, in the 
paper on the Mollusca, was queried as Ampullaria 
papyracea, is now almost definitely referable to A. ama- 
zonica. of which it appears to be a smaller variety, the 
type specimen in the British Museum being much 
larger. This is the species which deposits the little 
masses of red eggs on the walls or sides of the trenches, 
and on the grass and other vegetation, especially the 
Victoria regia, growing in the water, and on which they 
feed — the masses of green eggs being referable to A 
glauca, the thick-shelled form. Again I have to 
acknowledge the kindness of Mr. Edgar A. Smith, the 
well-known conchologist of the British Museum, in 
naming our specimens. 
z 
