678 REY. R. B. WATSON ON THE PECULIARITIES [Dee. 7, 
This genus thus bears to Achatina the same relation that Arion 
does to Limex, and Nanina to Helix. 
All the members of the genus have the shell highly polished, its 
brilliant lustre being obviously connected with the perpetual move- 
ment upon it of the mantle, and especially of its posterior prolonga- 
tion, a movement also eminently characteristic of Nanina. 
In spite of very careful search no dart could be found. 
The jaw is horny, light brown, crescent-shaped, crossed from be- 
hind forwards by numerous small converging ridges, one of which 
forms a distinct median line. The edge is not toothed, but forms a 
continuous curve. The radula consists of numerous rows of multi- 
tudinous teeth. The centre tooth is minute, with a sharp central 
point and a faint point on either side like ashoulder. Itis attached 
to a strong, flat, basal plate, shaped like the erescent-formed cutting- 
knife of a shoemaker or half a dumb-bell. he lateral teeth are 
ANN } 
a 9 a 
Fig. 1. Lovea (Achatina) tornatellina, Lowe. 1. enlarged; 1 a, natural size. 
2. Jaw, greatly magnified. 
3. Radula, central and first lateral teeth, magnified. 
3. a, ¢, left and right laterals; b, central tooth : greatly magnified. 
4. Teeth intermediate between the centrals and extreme edge, greatly mag- 
nified. 
- Teeth at extreme edge, magnified; a, one of the same, greatly mag- 
nified. 
on 
much larger, with a strongly developed centre point and two broad 
sharp shoulders. They are attached to flat, square, basal plates. 
As they pass over from the centre, they become more and more ru- 
dimentary (the outer shoulder first retreating toward the base), till 
they become at last mere square specks with an undefined back and 
a faintly serrated front edge. I believe that these features will be 
found common to all the distinctively Madeiran species of this group. 
Of course Achatina acicula and Cochlicopa lubrica (the maderensis 
