242 F. Stoliczka — Notes on Terrestrial Mollusca. [No. 3, 



blance of the shell to that of infula, it is tolerably certain that both 

 belong to one and the same genus. 



Genus. Sesara, Albers. 

 Heliceen, edit. 2nd, p. 91, (see pi. xvi, fig. 4 — 10). 



W. Blanford has already pointed out* 4 the correct classification of 

 this genus in the Zonittd^e, Albers having placed it as a subgenus 

 of Helix. The type of the genus is Helix infrendens, Gould. It re- 

 presents a group of small, lentiform Zonittd^e, composed of numer- 

 ous whorls, transversely ribbed above and smooth below, gener- 

 ally imperforate, with a thickened columellar lip and a small aper- 

 ture, being very often contracted by variously shaped teeth or ribs 

 on the outer, or on the inner, lip, or on both of them. Young 

 shells are very similar to those of Rotula, but can generally be 

 distinguished by the thickened columellar lip. 



I have examined the animal of S. infrendens and pylaica. Both 

 are quite similar. The foot is very long, narrow, with the terminal 

 gland distinct and a small, hook-like, pointed appendage above it. 

 The sole has two longitudinal grooves, rather close together, the 

 median portion being narrower than each of the outer parts. The 

 mantle edge is nearly entire, the left shell-lobe is below 

 internally considerably thickened, the left dorsal lobe is very 

 small, or almost obsolete; the right shell-lobe is # thin and 

 somewhat convex, but without any separate appendage. The 

 internal anatomy does not differ from that of Rotula and other 

 Zonitid^e, but there is some peculiarity to be noticed in the 

 arrangement of the genital organs. 



I have dissected a young and an old specimen of S. infrendens. 

 In the young I found, (see pi. xvi, fig. 4), a simple, rather thin 

 uterus and a tube leading from the end of it to the penis, which 

 had a long appendage. 



In the old specimen (see pi. xvi, fig. 5,) the uterus, prostata, 

 albuminous and hermaphrodite glands are of the usual form, but in 

 the place where the receptaculum seminis should be situated I found 

 a long, twisted, thin sac, partially divided in the lower part. This 

 muscular sac contained three horny, curved tubes, (fig. 6), twisted 



* Ann. and Mag. Nat. Hist., 3rd ser., 1863, xi, p. 81. 



