THE NATURAL HISTORY SURVEY. 261 
Length, 16.00; width, 8.50; aperture length, 11.40; width, 6.00 mill. (10440.) 
“ ~ 14.00; =Cieehiea (a 45 ee ie OinOsy ee °5.605 “2 0440.) 
Animal: Almost transparent, with a short, wide foot, 
bluntly rounded behind; head separated from foot by a con- 
striction, wide, bifurcated; tentacles short, thick, triangular, 
transparent; eyes black, situated on small prominences at the 
inner base of the tentacles; color dirty white, darker on the 
body which is covered with white spots, seen through the 
transparent shell; edge of mantle transparent, simple; head 
above lilac-tinted; respiratory orifice on right side of body, 
near the junction of the upper part of the columella with the 
body whorl; the head is not much in advance of the edge of 
the shell when the animal is in motion; the animal appears 
much too large for the shell. Length of foot 8.00; width 5.50 
mill. The heart is situated on the left side of the animal, as 
in destdiosa. The pulsations are rather irregular, three or four 
being quick, followed by a pause; they vary from fifty-three to 
sixty per minute. 
Fia. 82. 
Jaws of LIMN4%A COLUMELLA Say. (Original.) 
Faw: Three, the median elliptical, smooth, the lateral 
jaws irregular; finely striated; cutting edges brownish black, 
shading into yellowish brown as the base of the cartilege is 
reached (Fig. 82). 
Radula formula: 3%+4+4+2+1+2+1-+4 45 (35 —1—35); cen- 
tral tooth as in the genus; lateral teeth with a quadrate base 
of attachment; reflection long and rather wide, reaching below 
the base of attachment, bicuspid, the inner cusp very large and 
long, the outer cusp small and sharp; the tenth tooth is trifid 
and connects the lateral and marginal teeth; marginal teeth 
much longer than wide, generally four-cuspid, the outer cusp 
placed about midway of the reflection; the other three placed 
at the distal end; there are generally several small denticles 
