COCHLOSTYLA-CORASIA. 115 



distinct buff-white margin about 1 mill, wide on the last whorl. 

 Surface nearly lusterless, delicately obliquely striate, decussated by 

 obsolete spiral striae. Spire low, apex obtuse. Whorls 4, the last 

 slowly descending in front, rounded at the periphery, a little concave 

 in the center beneath. Aperture large, oblique ; upper margin of 

 the peristome slightly expanded, basal subreflexed, the columellar 

 margin reflexed and closely adnate, closing the umbilicus by a thin, 

 convex, dilated plate. Inner edge of the columella concave, not 

 angled where it passes into the basal margin. 



Alt. 20, greater diam. 23, lesser 20 J mill. 



Java. (A. D. Brown coll.) 



This species differs from its allies in having the axis perforated, 

 the perforation closed in the adult by a thin convex plate (fig. 8). 

 It is described from the collection of the late A. D. Brown, now in 

 the Academy Museum. 



H. NAJAS Pfeiffer. PI. 27, fig. 13 (var. fig. 12) ; pi. 28, figs. 31, 32. 



Shell depressed -globose, thin, regularly lightly sculptured with 

 close striae; yellowish-white; spire short, obtuse; whorls 4, a little 

 convex, rapidly increasing, the last inflated, somewhat descending 

 in front ; aperture oblique, large, subrotund ; peristome thin, nar- 

 rowly expanded throughout, the upper margin arcuate, columellar 

 margin subvertical, lightly thickened, (r. Mart.) 



Alt. 18 i, greater diam. 25, lesser 19 mill. 



Alt. 22, greater diam. 31, lesser 23 mill. 



Amberbaki, New Guinea; Islands of Burn and Goram, Moluccas. 



H. najas PFR., Symbolse iii, p. 71, 1846; Monogr. i, p. 261; 

 Conchyl. Cab., t. 53, f. 12, 13. PHILIPPI, Abbild. etc., ii, t. 9, f. 5. 

 MARTENS, Preuss. Exped. Laudschn., p. 330, t. 18, f. 4.- 

 TAPPARONE CANEFRI, Ann. Mus. Civ. di Stor. Nat. di Genov. xix, 



p. 187, 1883. 



A thin, shining species, allied to H. extensa, H. obliquata and H. 

 physalis. Numerous specimens are before me, showing considerable 

 variation in contour both in the direction of H. physalis and H. 

 obliquata. These three species may perhaps prove to be connected 

 by intermediate forms. 



C. PHYSALIS Pfeiffer. PI. 27, figs. 2, 3. 



Imperforate, globose-depressed, thin, striatulate and under a lens 

 seen to be minutely punctulate somewhat shining, translucent, very 

 pale greenish-white. Spire very shortly elevated, convex, obtuse ; 



