22 HELIX-PAPUINA. 



Outer lip thin, narrowly expanded, slightly sinuous; triangularly 

 dilated at the umbilicus, nearly closing it; columella vertical, 

 slightly arcuate. Alt. 22, diam. 18 mill. 



Bougainville Island, Solomon Group. 



H. hermione ANGAS, P. Z. S. 1869, p. 625, t. 48, f. 5. PFR., 

 Monogr. vii, no. 2672. BRAZIER, P. Z. S. 1872, p. 805. H. bio- 

 cheana CROSSE, Journ. de Conchyl. 1870, p. 249. 



Smaller and thinner than any form of H. meta, more distinctly 

 carinated, differently colored, and with a narrower lip. 



H. MIGRATORIA Pfeiffer. PI. 6, figs. 99, 1, 2, 3 ; pi. 17, figs. 31, 32. 



Narrowly, obliquely perforated ; trochiform periphery obtusely 

 angular ; very lightly striated, with traces of spiral lines on the base ; 

 shining flesh colored, often varying toward white or brown ; usually 

 having a brown band below the periphery and another on the upper 

 surface, but often bandless, and generally showing some sparsely 

 scattered translucent-grayish dots. Lip narrowly expanded, white. 

 Suture bordered by a narrow brown line. 



The shell varies greatly in form. Spire conical, whorls 5, convex, 

 apex obtuse ; the last whorl is convex above, and has an incon- 

 spicuous angle at the periphery. The base is convex. The whorl 

 generally descends a trifle in front. Aperture very oblique, flesh 

 colored, white or banded within ; outer lip markedly sinuous, nar- 

 rowly reflexed, dilating at the columella, almost covering the 

 narrow perforation. 



The banding is excessively variable. 



Alt. 16*, diam. 17 mill. 



Alt. 22i, diam. 18 mill. 



Alt. 20, diam. 17 mill. 



Guadalcanar, San Christoval, etc., Solomon Is. 



H. migratoriaPFH. P. Z. S. 1855, p. 108, t. 32, f. 3; Monogr. iv, 

 p. 260 DOHRN, Contin. Conchyl. Cab. p. 587, t. 172, f. 16-19. 

 H. leucophcea Cox, P. Z. S. 1872, p. 20, t. 4, f. 5. 



This species has a pallid, faded aspect, and in some respects it 

 approaches several imperforate species. Ten of the eleven speci- 

 mens before me show the grayish dots mentioned above, although 

 there are very few on some of the specimens. The principal color 

 forms are as follows : 



a. Straw-colored without band or dots. 



b. Straw-colored, sparsely dotted. 



