220 ANIMAL REPRODUCTIONS. 
head of the fnail, which are much more nus 
merous and complicated than at firft fight could 
be credited. (1). 
When one of thefe reptiles (2) extends as far 
as poffible from the fhell, it exhibits the whole 
neck and head. From the ariterior part of the 
latter proceed the four horns, that is, the two 
larger above and the two fmaller below. When 
completely elongated, each terminates in a glo- 
bule ; but in the larger is a black point, gener- 
ally thought to be the eye. Immediately below 
the fmaller horns, the lips appear ; and when 
they open, while the animal feeds, the teeth are 
feen. All thefe parts, as well as the neck, are 
covered with minute glandular granuli, fomewhat 
fimilar to thofe of a {ftrawberry, or like /hagreen. 
But this fhagreen on the horns and lips is finer 
than 
(1) This Memoir is extraéted from my work on Ani« 
snal Reproductions, which would have been publifhed be- 
fore now, if fome engravings effentially haere for un- 
derftanding it had been completed. 
(2) The Linnean gentlemen will pardoni me for not 
being difpofed to clafs {nails with worms, as their refpec- 
table mafter does. This is not the place to thew how 
little that opinion cotrefponds with nature. tt will more 
properly fall within the limits of my work, when com- 
plete, where, among other things, will be a difeuiffion 
whether the modern theorifts and nomencelators have been 
the moft ufeful to natural hiftory. 
