166 



HELIX. 



H. RESERATA, Heude. PL 36, figs. 38-41, 



Dextral, obliquely costulate, smoother below, periphery angulated 

 and laciniated; whorls 6, the last descending; peristome subcon- 

 tinuous, vertical lamina with small denticles in front of it, palate 

 with four lamellae, and a smaller tooth near the umbilicus. 



Diam. 15 mill. 



Tchenkeou, China. 



H. SCHLUMBERGERI, Morlet. PL 36, figs. 25-28. 



Dextral, shining, brownish, with close coarse striae above, crossed 

 by slight spiral lines, smooth below ; whorls 7, subcarinated above, 

 subangulate below, the last not descending anteriorly ; aperture with 

 the usual parietal entering plicae, and a deep-seated large vertical 

 lamina, and another much smaller transverse one, palatal teeth six, 

 minute. Diam. 26 mill. 



Tonkin. 

 H. BIFORIS, Heude. PL 36, figs. 12-16. 



Dextral, whorls 61, slowly increasing, the last deflected in front, 

 brownish, spirally plicately striate, the angulated periphery lacin- 

 iated; parietal vertical laminae two, joined above and below by 

 transverse ridges, with a free transverse lamina below, palate with 

 four teeth, and a smaller one close to the umbilicus. 



Diam. 15 mill. 



China. 



Unfigured Species. 



H. JUGATORIA, Ancey. China. 



H. REVOLUTA, Pfr. Andaman Is. 



Group VI, VALLONIA, Risso. 1826. 



Shell umbilicated, depressed, minute, diaphanous; whorls 4, or 

 less ; aperture obliquely subcircular, with a white reflected peristome, 

 the margins converging. 



H. PULLCHELLA, Mu'ller. The few species occur in the temperate 

 and colder countries of the northern hemisphere. The type inhabits 

 North America, Europe, and Northern Asia, and has been exten- 

 sively spread by commerce in other countries. 



The principal synonyms are Zurama, Leach, Amplexut, Brown, 

 Chilostoma, Fitz. (in part), Glaphyra, Albers and Lueena, Moquin- 

 Tandon. 



