OF CONCHOLOGY. 221 



panded over but not closing the umbilicus, and furnished with a 

 large compressed, obtuse, oblique fold ; parietal region thinly 

 callosed, with two stout teeth, the lower bilobed, transversely 

 entering the aperture ; the upper tooth subtrilobate. 



Length, 29 mill. ; diam., 16 mill. 



Habitat, Tavinni Id., Viti Isis. (Coll. Garrett and Philad Acad.) 



Pythia perovata, Garrett. Plate 19, fig. 5. 



Shell slightly perforate, or imperforate, solid, ovate, com- 

 pressed, corneous or light chestnut-brown, often deep brown, 

 mottled with darker, and generally with a dark sutural band ; 

 spire short, subacute, conical, with convex outline, a little more 

 than a third the length of the shell ; whorls 8 — 9, flatly convex, 

 the last large, oval, longitudinally coarsely striated, striae most 

 developed above ; suture rudely crenulate ; aperture subvertical 

 narrow, white, yellowish-white or tawny; peristome rounded and 

 expanded anteriorly, slightly reflected, the inner margin copiously 

 callosed, and furnished with four teeth, rarely five, two much the 

 larger; columella expanded, with a stout somewhat oblique fold; 

 parietal region glazed, with two stout, fold-like teeth, the lower 

 double, compressed, entering the aperture, the upper vertical, 

 compressed. 



Length, 24 mill. ; diam., 13| mill. 



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



A very abundant species inhabiting the margins of the Man- 

 grove Swamps. It only occurred to our notice in two locations ; 

 Natawa Bay and Na Viti Levu Bay. 



Nanina Hoyti, Garrett. Plate 19, fig. 6. 



Shell narrowly perforate, turbinately globose, rudely striated 

 beneath the suture, shining, subpellucid, whitish or yellowish 

 horn color, with a brown band beneath the suture ; spire obtuse, 

 depressly conoid ; whorls six, convex, the last swollen, rounded; 

 suture Avith or without a deep brown line ; base paler, smoother 

 and more polished than above ; aperture diagonal lunate, circu- 

 lar, nearly equal in length and width, white or bluish-white with- 

 in ; peristome thin, simple and slightly sinuous ; columella sub- 

 reflected, nearly covering the small umbilicus, and generally of 

 a tawny flesh color. 



Greatest diam., 21 mill. ; length, 15 mill. 



Habitat, Tavinni Id., Viti Isles. (Coll. Garrett and Tryon.) 



