196 . TURRITELLA. 



T. BACILLUM, Kiener. PL 59, figs. 34, 35 ; PL 60, fig. 42. 



Whorls somewhat flattened in the middle, but with deep 

 suture, with about 6 revolving ridges and fine intermediate 

 striae ; light yellowish ash to chestnut-color, the ridges on the 

 larger whorls often marked by darker lines. Length, 4-5 inches. 



Ceylon, China. 



This is possibly only a variety of T. terebra, the essential differ- 

 ence being that its whorls are somewhat flattened in the middle. 



T. cerea, Reeve (fig. 35) is a synonym. In the darker colored 

 specimens, called T. crocea, by Kiener (fig. 42), there is often a 

 more or less defined lighter colored sutural band. 



T. UNGULTNA, Linn. PL 60, fig. 43. 



Whorls about fifteen, convex, rather smooth, with about ten 

 low ridge-like striae, the interstices superficially striulate ; chest- 

 nut-color, becoming dark chocolate towards the aperture. . 



Length, 3 inches. 



T.fuscata, Lam., is a synonym. West Africa. 



T. NIVEA, Gray. PL 60, fig. 44. 



Whorls about 20, convex, a little slopingly flattened around 

 the upper part, encircled by seven to ten low ridges and inter- 

 mediate striae. Length, 3*5 inches. 



East Coast of Africa. 



I have some doubt about the correctness of the locality 

 assigned for this species, and think it very probable that it will 

 prove to be a colorless variety of T. ungulina. In one of the 

 specimens before me the spire is chestnut-tinted. 



T. COMMUNIS, Risso. PL 60, figs. 45, 46. 



Whorls about 15, convex or somewhat flattened, the last some- 

 times with an obtuse angle below, with spiral slight ridges and 

 intermediate striae, often several of the ridges stronger ; yellow- 

 ish brown to rusty chestnut color, often variegated in irregular 

 longitudinal stripes, interior of aperture usually purplish tinged. 



Length, 2 inches. 



Europe, 



The nomenclature of this species is somewhat involved. . It is 



