ANIMAL REPRODUCTIONS. 357 
portant diftinGtion. A little under the eye, on 
the left fide, was feen a very minute tubercle, 
_ which feemed to be a fecond horn growing out of 
the large one. I fought in vain for the parts 
conftituting a mouth in this fnail. No veltiges 
of it could be difcovered, nor was there the {mall. 
eft indication of the two {mall horns. ° 
The fecond {nail exhibited another kind of 
monttrofity.. Only one large horn had protrud- 
ed; but at the extremity I thought I could difcern 
three black eyes, which were fo clofe, that they 
feemed confounded together, fig. 17,18: the fi- 
gures are magnified. On the upper part of the 
horn were very diftinly obferved three parallel 
optic nerves, only one of which proceeded to the 
three minute eyes. Under this horn, and at a 
little diftance from the origin, a very {mall one 
was difcovered, apparently firft beginning to ex- 
pand. Here, as before, there was no vilible in- 
dication of the parts forming the mouth. 
I examined the two {nails again on the 25 of 
October, both with the naked eye and a magni- 
fer. Reproduétion had made very fenfible pro- 
srefs. Only eight of the whole fnails were now 
alive, and all of that {pecies with a yellow. or 
yellowith fhell.. The other fixteen had perifhed, 
fome fooner, fome later. 
The fix {nails, whofe reproduction I had net 
yet examined, were immerfed in water. Mott of 
Z 3 them 
