GUDE: ON NEW HELICOID LAND-SHELLS. 263 
Two specimens were received in 1893 from Mr. Sowerby as Helix 
Howardi, Ang. The present shell, however, is larger and more 
depressed than that species, the sculpture is different, and the 
aperture is more rounded in outline, while the umbilicus is narrower 
and partly covered by the columellar margin of the peristome. 
T. meridionalis also resembles 7. patruelis, but the latter has the 
whorls more rounded, is less depressed, and is totally devoid of keel. 
Mr. Ponsonby possesses a specimen of the new species, measuring 
30x25 x%17mm. An interesting instance of tenacity of hfe was 
observed with the specimens under discussion. They were received 
on November 13th, 1893, when they were placed in a box and put on 
one side; on July 7th, 1894, on being brought out for re-examination, 
the animals were found to be still alive, and being placed on some 
damp moss they soon began to crawl about. 
3. LepraRionta vENusTA, usp. Pl. VII, Figs. 8-11. 
Shell subcovered perforate, trochoid, very finely striated, thin, but 
solid, shining, chalky white, suffused with greenish yellow round 
the umbilicus and with a brown umbilical patch; variously banded 
with pale or dark brown or black. Spire trochoid, suture impressed, 
apex obtuse. Whorls 3}, rounded at the periphery, inflated, increasing 
slowly at first, the last widening rather suddenly, dilated and becoming. 
obtusely angulated towards the mouth, descending shortly in front, 
a little excavated around the umbilicus, and slightly gibbous behind 
the basal margin of the peristome. Aperture oblique, transverse, 
subtrigonal ; peristome white, the margins slightly thickened and 
expanded, the basal margin reflexed, the columellar margin slightly 
dilated and overhanging the narrow perforation of the umbilicus. 
Diam. maj. 20°5, min. 16 mm.; alt. 12°56 mm. 
”? ) 19, ”? 14°5 »» 12 ) 
m+ 99 25, 5, Ad » illo ,, 
Hab.—Chiriqui, Panama. 
Compared with Z. Costaricensis, Roth, its nearest ally, Z. venusta 
is smaller, more elevated in the spire, rounded instead of keeled at 
the periphery, while the aperture is less spread out, and the umbilicus 
is reduced to a narrow perforation, partly covered by the shghtly 
dilated columellar margin. The spiral sulci of its congener are 
absent. 
In regard to coloration and banding the same range of variation 
appears to obtain in the two species, and there can be no doubt that 
they are divergent descendants from a common stock. The banding 
may consist of a narrow, brown, peripheral band, or of two broader, 
supra-peripheral bands, either black or rich chestnut brown; in the 
latter case the colouring of the bands is intensified at the edges, 
especially the lower; in some specimens there are two supra-peripheral 
bands of a pale brown or greenish yellow, occupying nearly the 
whole of the upper surface, leaving only two narrow white zones, one 
below the suture and the other between the two bands. 
