108 COCHLOSTYLA-CORASIA. 



H. LACTIFLUA Pfeiffer. PL 13, fig. 36. 



Shell imperforate, globose-turbinate, acutely carinated at the 

 periphery ; thin, translucent-whitish, having a narrow opaque milk- 

 white band at the carina. 



Surface smooth, lightly marked by oblique growth-lines, and under 

 a lens seen to be finely spirally striated, these striae usually obsolete 

 on the last whorl. Apex obtuse. Whorls 4-4}, convex, the last not 

 descending in front, or but slightly descending. Aperture large, 

 rounded-rhomboidal, oblique; outer and basal margins of the white 

 peristome evenly reflexed, becoming wider toward the base of the 

 nearly vertical columella, the face of which is flattened and distinctly 

 excavated, the columella is deeply inserted in the base, and the axis 

 is narrowly perforated in young shells. 



Alt. 20, greater diam. 23 mill. 



Alt. 17, greater diam. 22 mill. 



New Georgia and Ysabel, Solomon Is. 



H. laetiflua PFR., P. Z. S. 1861, p. 190; Novit. Conch., p. 175, t. 

 47, f. 7, 8 ; Monogr. v, p. 270. H. isabellensis Souv., Journ. de 

 Conchyl. 1863, p. 74, 173, t. 5, f. 1. PFR., Monogr. v, p. 270. 



A turbinate, glassy-white shell, having a white line at the acute 

 carina. The face of the columella is flattened and excavated below. 

 There are sometimes inconspicuous linear whitish streaks, in the 

 direction of the growth-lines. 



I am unable to separate H. isabellensis (pi. 13, fig. 37, 38) from 

 lactiflua. Being from a different island ( Ysabel) it may prove to be 

 a variety, but the characters assigned to it afford no distinctive 

 marks whatever, so far as I can see. 



H. PURCHASI Pfeiffer. PI. 13, figs. 46, 47. 



Imperforate, ovate-depressed, very thin, very closely plicatulate, 

 subdecussated by spiral lines, pellucid, whitish corneous. Spire 

 short-conoid, obtuse; suture impressed, margined. Whorls 3 to 4, 

 rapidly increasing, convex, the last large, not descending in front, 

 encircled by a milk-white, acute, compressed peripheral carina ; 

 beneath inflated, the base gibbous ; aperture large, oblique, angulate- 

 lunar ; peristome thin, shortly expanded, basal margin a little re- 

 flexed, columella arcuate, compressed, slightly calloused. 



Alt. 13-14, greater diam. 22-23, lesser 17-17* mill. (Dohrn.} 



Admiralty Islands. 



