44 HELTX. 



H. SEMIPLTOATA, Pfr. PL 4, figs. 62, 63. 



Ver}^ widely umbilicated, subdiscoidal, somewhat solid, plicate 

 above, light corneous, maculated with chestnut; whorls 7, very 

 narrow, a little convex, periphery carinate, base convex, smooth- 

 ish. Diam. 6'5 mill. 



Ins. Madeira. 



H. Gueriniana, Lowe, is a synonym. 



H. CALATHOIDES, Paiva. PL 3, figs. 91-99. 



Yery widely, perspectively umbilicated, obsoletely or obtusely 



angulate or carinate, rather solid, with strong costae above, 



ending at the angle, smoothish on the base, suture very distinct; 



whorls 7-8, a little convex, slowly increasing. Diam. 7-8 mill. 



(Subfossil). Inn. Bugio, near Madeira. 



Closely allied to the foregoing species. 



H. RETEXTA, Shuttleworth. PL 4. figs. 64-66. 



Umbilicated, depressed, rather thin, closely subarcuntely cos- 

 tate above, chestnut color with paler maculations ; apex more or 

 less depressed ; whorls 6, convex, narrow, subequal, periphery 

 angulated, base shining, smoothish, umbilicus very wide. 



Diam. 7 mill. 



Ins. Palma, Canaries.. 

 H. CORTICOLA, Cox. PL 5, figs. 71, 72. 



Openly umbilicated, a little shining, irregularly strongly cos- 

 tulate, fulvous chestnut color, with radiating lighter lines; 

 whorls 5, slopingly convex, periphery obtusely carinated, the 

 carina obsolete at the mouth, base smoothish, with slight obso- 

 lete spiral lines. Diam. 8 mill. 



Richmond River, Australia. 

 H. MUCOSA, Cox. PL 5, figs. 73, 74. 



Widely, perspectively umbilicated, subdiscoidal, irregularly 

 closety rugosely striated, rather solid, glimmering, apex sub- 

 immersed; whorls 4^, slowly increasing, a little convex, the last 

 deflected in front, periphery obsoletely carinate, base convex, 

 less roughly striated than above. Diam. 8 mill. 



Clarence River, New South Wales. 



II. MUCOIDES, Stephens. PL 5, figs. 75, 76. 



Widely umbilicated, rather solid, somewhat shining, irregu- 

 larly corrugately striate, translucent, yellowish horn-color, 



