146 VITRINA. 



Y. SIEVERSI, Mousson. PL 31, fig. 51. 



Minutely perforate, depressly convex, heliciform, very thin 

 and fragile, pellucid, light corneous; spire convex, the apex 

 small, obtuse ; whorls 4, convex, with strong striae near the 

 suture, the last whorl large, depressed-rounded, smooth and 

 more shining below ; aperture round-oval, the lip slightly 

 reflected at the umbilicus. Diam. 5*8, alt. 3-2 mill. 



Caucasus. 



The shell looks like a Helix, but the animal is said to be too 

 large. Described as a Helicarion. It, as well as the preceding 

 species, has been made a synonym of F. annularis, but they 

 both appear to be very distinct from that species. 



Y. PAULUCCI.E, Fischer. PI. 31, figs. 52, 53. 



Very minutely perforate, orbicularly subglobose, thin, fragile, 

 pellucid, scarcely shining ; whorls 3^, convex, obliquely striate 

 and obsoletely plicatulate ; aperture oblique, transversely ovoid, 

 the lip regularly arcuate, touching the perforation. 



Diam. 3'5, alt. 2-3 mill. 



Aspromonte, Calabria. 



Very closely allied to F. annularis, perhaps identical with it. 



Y. KUGOSA, Paulucci. PL 31, figs. 54-56. 



Very minutety perforated, rugose, orbicularly depressed, 

 fragile, hyaline, light yellowish, strongly ribbed at the suture; 

 whorls 3J, convex, rather rapidly increasing, the last wider, 

 rounded, subcompressed in the middle, dilated at the aperture; 

 aperture transversely ovate, the coluinellar margin lightly arcu- 

 ated and reflected. Diam. 5, alt. 3 mill. 



Abruzzi, Italy. 



Probably only a variety of F. annularis. 



Y. MUSIGNANI, Mandralisca. PL 31, figs. 57-59. 



Subglobose, pellucid, hyaline, thinly elegantly striate, whorls 

 3, the last subangulate, aperture rounded, spire a little exserted. 



Diam. 4, alt. 2 mill. 



Sicily. 



This is also too closely allied to F. annularis. 



Y. EXILIS, Morelet. PL 31, figs. 60, 61. 



Subperforate, rather convexly depressed, very thin, pellucid, 

 hyaline, very lightly and distantly striate ; suture impressed, 



