GASTEROPODA. 143 
AnimaL very much like M. sczpio, perhaps a little more orange, 
with similar concentric lineations of brown; tentacles dotted rather 
than annulated ; foot, in the young, nearly rose-red; fringes of the 
mantle long. 
Mr. Hinds has described a medium-sized specimen of this very va- 
riable species, so variable that some notice of the varieties is required. 
Its essential character is the grooves upon the surface, which are 
distant, irregular, deep, with abrupt walls, and these being crossed by 
pronounced lines of growth, give a minutely cancellated appearance. 
The grooves cover the whole, or more generally the lower portion, 
of the whorls. The colour is olive-green, sometimes banded with 
dusky, and sometimes with longitudinal flammules; sometimes with- 
out either. 
The whorls are gracefully rounded in most cases, but some have 
them perfectly flattened, and in consequence are angular around the 
last whorl. The suture is deep and broad, with an abrupt ridge at 
the top of each whorl. In the young stages, doubtless, several of the 
apicial whorls are always folded; but in some, well-marked folds are 
found on all the whorls except the largest. Some correspond accu- 
rately with Hinds’s figure in size and colour; but he does not dwell 
on its constant character,—the grooves. Some very old, and probably 
injured, specimens have a scabrous surface, with raised instead of 
grooved lines. One specimen is three-fourths of an inch broad. 
Inhabits the Feejee and Samoa Islands, and apparently is very 
abundant. 
Figure 160, shell with the animal, as in motion; 160 a, young spe- 
cimen ; 1604, oblique view of the aperture; 160c, young. 
MELANIA PLICIFERA (Lea), Trans. Am. Philos. Soc., vi. 93, pl. 23, 
f. 90. 
This shell seems to be subject to great variety, or else there are 
several allied species. The typical shell has the spire elongated, 
pointed, and the whorls flattened, with coarse, longitudinal folds. 
Others are surrounded by numerous raised lines, and are nearly 
destitute of folds. 
