INTRODUCTION. §\ 
ber and October, 1818, which were intended as a sort 
of prodromus of his discoveries in the West, he nowhere 
speaks of having collected land shells, although the flu- 
viatile species, divided as usual into several genera and 
sub-genera, occupy considerable space. As he could 
not, without a gross infraction of that comity practised 
among naturalists, which secures to each his own discov- 
eries, and which even he was not prepared, at that time, 
entirely to disregard, openly assume the species described 
or made known by Mr. Say, he could publicly gratify 
his mania for genera-making only by the construction of 
these new genera. But, he gave to the specimens in 
his own cabinet, specific names which he thought more 
appropriate than those of Mr. Say, and they gradually 
found their way to his correspondents abroad, and par- 
ticularly to M. Ferussac, with these names attached. 
In his Annals of Nature for 1820, M. Rafinesque 
proposed three new genera and several species, viz. : — 
GENUS PHILOMYCUS. 
Philomycus. " Differs from Limax by no visible mantle, 
the longer pair of tentacula terminal and club-shaped, 
the shorter tentacula lateral and oblong. The name 
means, friend of fungi, on which they feed. 
" Philomycus quadrilus. Gray, back smooth, with four longi- 
tudinal rows of black spots, long tentacula black and ap- 
proximated ; rather attenuated behind, tail obtuse. On the 
banks of the Hudson, length over half an inch. 
