222 . 
ZOOLOGICAL LITERATURE. 
M. Stabile, in an appendix to his work ^ Mollusqnes terres- 
tres vivants du Piemont/ p. Ill, &c., gives a general arrange- 
ment of the Land-snails according to the known differences in 
the structure of their jaws; it is nearly identical with that given 
by Morch, but more complete as regards genera and subgenera. 
On pp. 114-117 the author treats of the differences in the form 
of the teeth of the radula, which are either simple, or hi-, tri-, 
or quadrifid, giving examples of the number of teeth in a single 
row, and of rows of teeth. The arrangement of the genera is 
the following : — 
Oxygnatha. 
a. Limax. Philomycus. Tennentia. Parmarion. Helioarion. Vitrina, 
Zonites. 
b. Macrocyclis. 
c. Simpiilopsis, Pellicula. 
d. Omalonyx. 
Aulacognatha. 
a. Ariophanta. 
b. Parmacella. Helix, sect. Delomphalus [Patula], Bradybsena, and Sagda. 
Bulimus, sect. Buliminus, Zebrina, Chondrula, Azeca, and Zua. Stenogyra, 
sect. Rumina and Subulina. Pupa. Balia. Clausilia. 
Odontognatha. 
a. Arion. Ariolimax. Megapel ta. Vaginulus. Helix, sect. Trigonostoma, 
Drepanostoma, Fruticicola part., and Xeropliila part. 
b. Liguus. 
c. Achatina. 
d. Limicolaria. 
e. Helix, sect. Ulota (H. fruticum), Xeropliila part., Isognomostoma, 
Arianta, Campylaea, Iberus, Macularia, Tachea, and Pomatia. Borus. 
Goniognatha. 
a. Bulimulus. 
b. Orthalicus. 
Agnatha. 
Testacella. Daudebardia. Glandina. Cylindrella. 
The authors of the different essays on classification mentioned 
in the preceding pages agree in one point, viz. in regarding the 
structure of the maxilla as a character of the greatest importance, 
and, we have no doubt, justly so. But the time is distant when 
we shall be able to rearrange the groups which have been based 
upon the shell, according to that other more important character. 
In the following review the Recorder will follow the arrange- 
ment proposed by him in the second edition of AlbeiVs ^Heliceen,^ 
with a few alterations only which have been rendered necessary 
by the latest researches ; and although convinced that it is not 
