REVIEWS. 171 
jaw which has no median beak-like projection to its cutting 
edge, but has rib-like processes on its anterior face, cren- 
ulating the margin. Its tongue differs also in the form of 
the teeth. In the forepart of its body, under the rounded 
shield-like process of the skin, there are calcareous grains 
instead of a well formed plate. And finally at its tail is a 
decided triangular perpendicular mucus pore. It grows 
about one inch long. The color is whitish, grayish or 
brownish; upper surface marked with elongated crowded 
glands; mantle oval, granulated ; tail obtuse, not carinated ; 
the sides marked with an obscure brownish line. It is of 
European origin and thus far has only been noticed in 
Boston and vicinity. It is not properly a cellar snail, but 
is found with the preceding species around kitchens and 
gardens. 
REVIEWS. 
om ; . 
ba, ALCHIHUITLS. * — [Mr. Squier has in this communication to the Ly- 
um given a very important and interesting summary of what is known 
Mida to pgs carved ** green stones ” from Mexico and Central America, 
and as he has kindly placed the original cuts of the article in our hands, 
we make this review in the form of extracts from his communication. 
In a future number we shall give figures of a few similar carved stones 
Ne et de Mr. McNiel in Nicaragua.] 
g the articles of ornament used by the aboriginal inhabitants 
of Mexico and Central America, those worked from some variety of green 
stone mbling emerald, and called by the Nahuatl or Mexican name 
Rp a UD. or chaichiuite,t were most highly esteemed, and 
are oftenest mentioned by the early explorers and chroniclers. The word 
‘chalchiuitl is defined by Molina, in his Vocabulario Mexicano (1571), to 
signify esmeralda baja, or an inferior kind of emerald. The precious em- 
erald, or emerald proper, was called quetzalitztli, from the quetzal, the 
bird known to science as the Trogon resplendens (the splendid plumes of 
which, of brilliant metallic green were worn by the kings of Mexico and 
* Ob C ti f Ch tral America. By E.G. 
From the Annals of the Lyceum of Natural History of New York. 2 
Ms pese followed the orthography of the word throughout, as given by tl i thors 
