92 THE PROCEEDINGS OF THE LINNEAN SOCIETY 



upper part of the mouth," &c, &c. The dimensions are then 

 given as 8 lines long and 7 lines for the diameter of the base. 

 These dimensions do not agree with Lamarck's, who in the place 

 quoted gives a base of lOf lines, which agrees more with what 

 we know of T. constricta. 



I now add my own notes of Trochocochlea constricta from Tas- 

 manian specimens, and mostly from South Tasmania (Southport), 

 where the species attains its largest size. Shell oblique, obtusely 

 oonial, dull or faint pink when fresh from the water, and yellow- 

 ish when dry, and having a coarse chalky appearance ; whorls 

 four to five, tumidly convex, furnished with seven to eight con- 

 spicuous rounded keels on the body whorl, and two on the others 

 (the one nearest the suture being the largest and most promi- 

 nent) ; the whole shell marked with fine oblique lines of growth ; 

 mouth, sub-auricular ; outer lip, double ; outer margin, calcareous 

 pinkish ; grooved at the keels, where it is often stained a deep 

 black, or sometimes the whole lip is black ; throat nacreous, silvery, 

 with little colour, with a few well-defined and prominent liras ; 

 columella, pure white, ending in a blunt tubercle ; enamel slightly 

 spread over, the base, on which also three or four ribs are marked 



with spiral black lines. 



I now subjoin my notes of the striped variety from the 



same locality. The shell is always smaller. It has less 



distinct and smoother keels of equal size, at most eight, on 



body whorl, and sometimes less. The colour is pinkish, or even 



reddish, with zigzag longitudinal flames of blue black, which in 



very dry and old shells become a reddish brown or green ; outer 



lip generally margined with black, throat of darker nacre, 



grooves of keel scarcely perceptible on outer lip, and lirse of the 



throat seldom visible ; columella, brownish ; tubercle almost 



obsolete. The liros of the throat are always present in the 



N.S.W. specimens. 



The differences between the animals seem to consist first in the 

 colour ; T. constricta is almost black, the base of the foot being 

 neutral tint, while T. tceniata is pale green and olive, with a little 

 black at the sides of the foot. Both have the mouth fringed, but 



