224 AMERICAN JOURNAL 



A common species, found on the trunks and limbs of trees in 

 damp forests. The two brown bands are constant characters. 



Persa melanostoma, Garrett. Plate 19, fig. 11. 



Shell small, imperforate, oblong-ovate, rather thick, smooth, 

 somewhat glossy, light tawny-brown, becoming brown-black on 

 the back of the body whorl, and generally a transverse dark band 

 beneath the suture; spire short, abbreviately conical, convex in 

 outline, about one-third the length of the shell, and striated with 

 fine spiral impressed lines, which become obsolete on the body; 

 whorls 5, convex, last one large ovate, rounded at the base ; ap- 

 erture subvertical, elongate-oblong, auriform, contracted above, 

 rounded below, black within ; peristome more or less thickened, 

 sinuous above, sometimes labiate within ; columella callosed, with 

 two rather large compressed transverse folds, and two smaller 

 ones on the parietal region. 



Length, 4J mill.; diameter, 3 mill. 



Habitat, Viti Isles. (Coll. Garrett and Philad. Acad.) 



An abundant gregarious species, found under stones in the up- 

 per region of the littoral zone, near high-water mark. 



Paludinella Vitiana, Garrett. Plate 19, fig. 12. 



Shell minute, imperforate, globosely ovate, rather solid, shin- 

 ing, yellowish-horn color; spire obtuse, broadly conoid, little 

 more than half the length of the shell ; whorls 5, rounded, ob- 

 soletely obliquely striated ; suture deeply impressed ; aperture 

 roundly ovate, angular above ; peristome simple, gradually be- 

 coming much thickened at its junction with the columella ; pa- 

 rietal region thinly callosed. 



Length, 2J mill.; diam., 2 mill. 



Habitat, Viti Isles. (Coll. Garrett and Philad. Acad.) 



This species, like the preceding, is gregarious, and is found un- 

 der stones a little below high-water mark. 



Navicella picturata, Garrett. Plate 19, fig. 13. 



Shell elongate-oval, rounded above, more or less laterally com- 

 pressed, thin, subpollucid, concentrically finely striated, tawny- 

 yellow, brown or blackish-brown, adorned with crowded small 

 subtriangular white spots and rays under a light yellowish-horn 

 colored epidermis ; apex slightly projecting beyond the base ; 

 interior bluish-white or light tawny ; columella region small, flat, 

 •ubtriangular, with the anterior margin strongly concave. 



