410 Binney's Monograph of the Helices 
It is the totality a the characters which make up 
the species, for individuals differ considerably in the 
height of the spire, the size of the umbilicus, and in 
the degree of prominence of the teeth. One x is 
occasionally wanting. 
The deposition. of testaceous matter, ees 
the shell at its aperture, occupies about one fourth of 
the base through which it is seen. The character 
of the lamellar folds within the aperture resembles 
those of Hexix epístylum, Murter, in which species 
they are large and prominent, although bese over- 
looked in the — 
31. HELIX SUPPRESSA. 
Plate XI. fig: 3. 
H. testa convexà sub- -depressá, mu ideae nitidà, luteo-cor- 
neà; anfractibus sex, numerosé et minuté stri ; labro simplici, 
dio, intus incrassato ; apertura transversàli, vea unico — 
armata. j 
SYNONYMS AND REFERENCES.. 
Helix suppréssa, Say. Disseminator of Useful 
sss nie nd New fete oer Til. 1829. 
Descnrezros. 
dnd Not hitherto Goal. ; 
Shell. Convex, depressed, pellucid ; -epidermis 
polished, yellowish horn-color ; spire. flat; ‘whorls 
six, with crowded minute obliquo strie ; suture im- 
pressed, distinct ; aperture transverse, not expanded ; 
