220 INTRODUCTION. 
Iii all three species of Limax, the cloaca is a short canal 
opening at the generative orifice on the right side of the 
head. 
Arion. The generative apparatus resembles more 
that of L. variegata than the other species. The penis 
is cylindrical, dilated at base, and has its retractor mus- 
cle inserted into the latter point. The generative blad- 
der is large, oval, pointed at summit, and has a very 
short but muscular duct, joined midway by the vagina. 
At the latter junction is inserted a second retractor mus- 
cle. The cloaca is long and dilated in the middle. 
Tebexnopiiorus. The testicle lies upon the right 
side, partly concealed by the liver ; it is round and tabu- 
lated. The epididymis is more tortuous than in the pre- 
ceding. The vas deferens is very long, tortuous, and 
muscular. It joins the penis at its summit, and has the 
retractor muscle inserted into it the length of the penis 
above the latter. The penis is irregularly cylindroid, 
bent at its summit. 
The ovary is exceedingly tabulated. The oviduct is 
tortuous, 'wide, aud very much sacculated. The prostate 
gland is longer than in Limax or Arion. The genera- 
tive bladder is large, globular, or nearly so. Its duct is 
rather less than half the length of the oviduct. At its 
junction with the neck of the latter, an oval, muscular 
organ exists, the dart sac. Within the latter at the bot- 
tom, is a hemispherical papilla, upon the summit of which 
