8 TEBEBRA. 



sections which will perhaps assist in grouping the species, 

 although the presence of transitional forms makes the bounda- 

 ries rather vague. 



Genus TEREBRA, Adanson. 



A. Whorls smooth, with or without a smooth sutural band, 



defined by a sulcus. 



B. Shell with plicate or tuberculate band below the sutures, 



defined by a sulcus. 

 * Whorls plicate. 

 ** Whorls smooth. 



*** Cylindrically many-whorled ; whorls with revolving 

 sculpture, with or without less prominent longitu- 

 dinal stria?. 



C. No sutural band ; whorls closely plicate or striate next the 



suture, elsewhere plicate or smooth. 



Subgenus EURYTA, Adams. 





Genus TEREBRA, Adanson. 



A. Whorls smooth, with or without a smooth sutural band defined 



by a sulcus. 



T. CRENULATA. Linn. PI. 1, figs. 1, 2, 6. 



Whorls obtusely noduled below the sutures ; carneous cream- 

 color, streaked with chestnut irregular lines between the nodules, 

 and with three revolving rows of small chestnut spots below, 

 two of which appear on the spire-whorls. Length, 3-5 inches. 



Indian Ocean Central Polynesia. 



T.Jimbriata, Deshayes (fig. 2) is a variety only, retaining the 

 juvenile characters shown by the upper whorls of this and other 

 smooth species of Terebra, namely, longitudinal plications and 

 a strongly marked sutural band. T. interlineata, Desh. (fig. 6), 

 is another example of the long persistence of juvenile characters, 

 and may be equally referred here. 



T. TIARELLA, Desh. PL 12, tigs. 38, 39. 



First few whorls plicate, the rest smooth, with spiral impressed 

 stria', sutural margin a little swollen and conspicuously nodu- 

 lous; fulvous fiuvu oi chocolate-colored. Length, '28-33 mill. 



Cape of Good l/i'. 



