OF CONCHOLOGY. 



225 



Length, 18 mill.; diam., 11 mill.; height, 6| mill. 



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



We obtained many examples of this pretty species at the 

 island of Vanna Levu, where they inhabit the lower parts of the 

 streams, within reach of the tides. 



Truncatella granum, Garrett. 



Shell imperforate, cylindrical, solid, cinereous ; spire cylindri- 

 cal, slightly tapering, decollated ; whorls persistent 4J, convex, 

 flattened on the middle, longitudinally ribbed, ribs small, verti- 

 cal, compressed, 20 on the body, narrower than their interstices ; 

 suture deeply impressed ; base carinate, the keel curving upward 

 along the external margin of the peristome; aperture small, 

 about one-fifth the length of the shell, somewhat oblique, ovate ; 

 peristome rather thick, slightly expanded, rounded ; columella 

 and parietal region copiously callosed and continuous with the 

 peristome. 



Length, 4| mill. 



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



This species only occurred to my notice in one locality, the 

 N. E. end of Tavinni Id. It is abundant and was found grega- 

 rious under stones a little below high-water mark. 



Assiminea Vitiensis, Garrett. Plate 19, fig. 14. 



Shell small, rimate, acutely ovate, solid, smooth, shining, 

 brownish-horn color, with or without one or two transverse paler 

 bands on the body whorl ; spire subacute, conical, outline con- 

 vex ; whorls 6, rounded, last one large, roundly ovate, under the 

 lens minutely striated, base slightly fissured ; suture linear, im- 

 pressed ; aperture subvertical, subpyriform ; peristome thin, sim- 

 ple ; columella slightly reflected ; parietal region thinly cal- 

 losed. 



Length, 4J mill. 



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



We found this species plentiful, crawling on the black mud in 

 mangrove swamps, where they were associated with Neritina? and 

 several species of Aurieulidce. Nearly all the adult examples 

 are more or less corroded. 



Pitys tumuloides, Garrett. Plate 19, fig. 15. 



Shell umbilicate, globosely conoid, rather thick, whitish, or 



