CHEMNITZIA. 445 
ending at the tentacula, which, though somewhat apart, are 
united by the usual membrane of the Chemnitzie; they are 
thick, broad, short, not very membranous, rounded at the 
tips, which have the characteristic minute flake-white lobe or 
inflation. The black eyes are not very near together; they 
are immersed exactly and close to the base of each tenta- 
culum, on minute white circles; they do not in the least 
invade the area of the neck, but rather impinge on the sta- 
mens of the tentacula.. The effete muzzle or mentum is 
undoubtedly the continuation of the neck, and has no con- 
nection with the foot; it is long, slender, grooved at the 
margins anteally and on each side, the upper and lower surface 
being perfect and unbroken; the vertical fissure of the mouth 
is under the tentacular awning. The foot is of the palest 
frosted-yellow, exceedingly short, narrow, deeply bifurcated in 
front, when at rest rounded behind, and a little lengthened in 
action. The animal examined was an “ Alma Venus,” and, 
when fully retracted, occupies the fourth volution ; the light 
green liver, and very pale red, granular ovarium, occupy the 
three primary volutions; but when the animal is fully out 
in the body of the shell, the liver and ovarium are altogether 
withdrawn from the first whorls, leaving them perfectly 
hyaline; they are then deposited in the lower part of the 
third and the whole of the fourth volution, the other parts of 
the body and organs being in the fifth and sixth. The narrow 
arcuated branchial plume of about 15-18 rather coarse, 
opake, pale drab strands, with the auricle and heart, distin- 
guished by their intense snow-white colour, are perfectly 
visible, under a powerful Coddington lens, at the smaller and 
posterior end of the branchial plume. I have been thus 
particular as to the site of the organs, because I never met 
with a shell so perfectly hyalme im which their position 
could be so well seen. The operculum is an almost invisible 
film, pear-shaped or suboval, with a narrow border of pale 
bistre with a pinkish hue; the striz of mcrement radiate as 
in most of the other Chemnitzie ; it is fixed on a plaim lobe 
near the posterior extremity. I saw no ornamental append- 
ages to the head and neck. In this example the apex is sub- 
