GASTEROPODA OF THE UNITED STATES. 25 



In all three species of Limax, the cloaca is a short canal 

 opening at the generative orifice on the right side of the 

 head. 



Ariox. 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. 



Tebexnophorus. The testicle lies upon the right 

 side, partly concealed by the Uver ; it is round and lobu- 

 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 cyhndroid, 

 bent at its summit. 



The ovary is exceedingly lobulated. The oviduct is 

 tortuous, wide, aud very much sacculated. The prostate 

 gland is longer than in Limax or Avion. 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 



4 



