HELIX-PLANISPIRA. 297 



Intermediate between H. expansa and H. plagiocheila ; above it 

 is like the former ; but the swollen base, color and form of the peri- 

 stome distinguish it from that species. 



H. EHODOMPHALA Tapparone Canefri. PI. 48, figs. 7, 8. 



Shell umbilicated, discoidal, depressed above, obliquely striate, 

 covered with a grayish-brown, velvety, shortly-hairy epidermis; 

 under the epidermis white, apex rosy, a rosy sutural zone on the 

 last two whorls, and two narrow brown bands, one edging the rosy 

 sutural zone, the other nearly peripheral ; umbilical region purplish ; 

 spire plane, apex sub-immersed. Whorls 4, a little convex, sepa- 

 rated by profound sutures ; the last large, subtumid beneath, behind 

 the aperture subconstricted, and below obliquely gibbous-crested ; 

 compressed around the rather open and perforating umbilicus; 

 scarcely descending in front. Aperture rotund-lunar, higher than 

 wide, very oblique, inside rosy toward the peristome, then white ; 

 peristome often blackish-purple, expanded and reflexed in every 

 part, margins converging, regularly arcuate, columellar scarcely 

 dilated, and reflexed above the umbilicus. 



Alt. 10, greater diam. 21, lesser 17 mill. (Tapp. Can.) 



Shores of the River Fly, Southern New Guinea. 



H. rhodomphala TAPP. CAN. Ann. Mus. Civ. Genov. xix, 1883, p. 

 176, t. 4, f. 12, 13. 



One example of the seven seen by Canefri was white all over, 

 less gibbous behind the aperture, the peristome broad, blackish- 

 purple. 



This species has much affinity to the preceding, but is easily dis- 

 tinguished by its greater depression above, larger size, form of the 

 upper margin of the peristome and the peculiar color of the lip. 



Group of H. margaritis. 



Crest inconspicuous. These species connect Cristigibba and Pla- 

 nispira ; they are from the Moluccas. 



H. MARGARITIS Pfeiffer. PI. 52, figs. 93, 94, 95. 



Shell depressed, moderately umbilicated, striolate, white, with 2 

 or 3 blackish-brown bands ; spire plane ; whorls 3J, scarcely 4, sub- 

 plane, the last convex on the base, not much descending in front ; 

 swollen, inflated, and then constricted behind the peristome. Aper- 



