OLEACINA, HAITI. 129 



Key to Haitian species of Oleacina. 



a. Shell large, about 50 to 60 mm. long, olivaceous, solid and 

 opaque, densely, finely striate. 0. voluta, no. 1. 



a 1 . Shell much smaller, yellowish, thin. 



&. Shell sinistral, about 15 mm. long. 0. paivaua, no. 7. 

 & 1 . Shell dextral. 



c. Nearly smooth; whorls almost regularly in- 



creasing. 



d. Outlines of the spire slightly convex. 

 e. Length about 20 mm. 



0. mulleri, no. 2. 

 e l . Length less than 17 mm. 



0. smithiana, no. 3. 

 d 1 . Outlines of the spire straight. 



0. pethionis, no. 4. 



c 1 . Surf ace grooved at irregular intervals; whorls 

 progressively more rapidly widening, the last 

 suture more oblique. 



d. Length 11 to 12 mm., about three times 



the diameter. 0. cleriei, no. 5. 



d 1 . Length 8 to 9 mm., more than three 



times the diameter. 0. microlestes, no. 6. 



Section OLEACINA s. str. 

 1. 0. VOLUTA (Gmelin). PI. 31, figs. 15, 16. 



The shell is solid but not thick, somewhat Co Hits-shaped, 

 widest at the shoulder, the sides convexly tapering to the 

 base, spire conic with straight sides and very obtuse apex. 

 The shell is of a rather pale, dull violet-rose color, with a 

 white band below the suture and whitish near the base, 

 under an olivaceous cuticle, which is almost entirely want- 

 ing in the example figured (fig. 16). The surface appears 

 smooth to the eye, but under a lens it is seen to be rather 

 deeply and regularly striate below the suture (fig. 15), the 

 stria? rapidly weakening to irregular growth-wrinkles below 

 the shoulder of the last whorl. The first 2y 2 whorls arr 

 smooth in the examples seen, which may, however, be some- 



