164 ZON1TES. 



H. NITENSOIDES, d'Orb. PI. 51, figs. 39-41. 



Widely umbilicated, thin, shining, pellucid, light greenish 

 corneous; whorls 4J, the last subdepressed, not descending; 

 aperture almost diagonal, Innately rounded. Diam. 10 mill. 



Cuba. 



The single specimen in the d'Orbigny collection differs from 

 the figure in having a narrower umbilicus and more declining 



O C7 C7 



columella, and can scarcely be distinguished from the true //. 

 alliaria. 



H. IMPLICANS, Guppy. PI. 51, fig. 42. 



Shell minute, discoidal, openly and widely umbilicated, whitish, 

 smooth, pellucid, shining; whorls 4, depressed, plane above, 

 slowly increasing, spire plane, aperture suborbicular. 



Diam. 2 mill. /. Trinidad, West Indies. 



Unfigured Species. 

 H. SMITHIANA, Pfr. Ml. Flaton, Ins. Haiti. 



H. BRYODES, Shuttlew. Porto Rico. 



**# Mexican, Central and South American Species. 



H. SAXATILTS, Couthou}'-. PL 52, figs. 49, 50. 



Umbilicus moderate, shell somewhat flattened above, convex 

 below, shining, lightly striate, greenish corneous ; whorls 4, mod- 

 erately increasing, suture channeled, aperture large, suborbicular 



peristome nearly continuous. Diam. 6 mill. 



T terra del Ftieyo. 

 H. ORDINARTA, Smith. PL 52, figs. 51, 52. 



Umbilicus rather wide, exhibiting two volutions, shell thin, 

 glossy, transparent, discoidal ; whorls 3^, convex, with channeled 

 and margined suture, last whorl rounded at the periphery, aper- 

 ture large, lunate. Diam. 3 mill. 



Tom Bay, Patagonia. 



"Apparently distinct, although a near relation to H. saxatilis 

 of Couthouy." 



H. INSIGNIS, d'Orb. PL 51, figs. 46-48. 



Moderately umbilicated, very thin, diaphanous, shining, 

 scarcely striulate, yellowish corneous ; whorls 4^, with suture 

 impressed, regularly increasing, the last double the width of the 



