PROSOPEAS. 29 



There is a tendency in the stouter form to verge towards the 

 variety which I have called oxynter, though the extreme speci- 

 mens might be considered as separate species" (Bens.). 



I have assumed that the second figure published by Hanley 

 and Theobald, under the title Spiraxis li aught oni var. Bens., 

 pertains to the var. oxynter, though it measures a little larger 

 than Benson's dimensions, possibly being slightly enlarged by 

 the artist. Two specimens referable to this form are figured, 

 pi. 6, figs. 82, 83, 84. The cuticle is dark olive. They differ 

 from P. pealei chiefly in the shape and direction of the colu- 

 mellar margin, which is less sinuous than in P. haughtoni. 

 Length 34, diam. 10, length of aperture 10 mm., whorls Sy 2 . 



23. P. PEALEI (Tryon). PI. 6, figs. 80, 81. 



Shell imperforate, solid, turrited, white under a thin green- 

 ish-yellow cuticle, with a few narrow darker streaks; the 

 apical whorls worn. Spire with straight lateral outlines. 

 Whorls 8%, slightly convex. Aperture long-ovate, oblique, 

 bluish-white inside; outer lip straightened above, thin and 

 acute. Columella slightly arcuate, passing without angle into 

 the parietal margin, not excised or sinuous at the 'base. Pari- 

 etal callus brownish, with distinct outer edge. Length 36.3, 

 diam. 10, length of aperture 11.3 mm. 



Andaman Islands. 



Opeas (Bulimus) pealei TRYON, American Journ. of Conch., 

 v, p. 110, pi. 10, f. 5 (Oct. 7, 1869). 



The type specimen is described above and figured. It has 

 been referred to P. haughtoni Bens, as a synonym, but it 

 differs from that by the non-sinuous columella, which does 

 not form an angle with the parietal wall, by the narrower 

 mouth, more numerous whorls and slenderer shape. The var. 

 oxynter of Benson, while nearly as slender as pealei, differs 

 by having the columella at an angle with the parietal wall. 



24. P. WALKERI (Benson). PI. 6, fig. 70. 



Shell imperforate, cylindric-turrited, arcuately very strongly 

 striated, whitish under the cuticle. Spire slender, the apex 

 obtuse, suture rather deep. "Whorls 9, a little convex. Aper- 



