62 Zoological Society. 
4. DescripTION OF A NEW SPECIES OF Box ToRTOISE FROM 
Mexico. By J. E. Gray, Esa., F.R.S. etc. 
In a collection of reptiles recently received from Mexico are two 
specimens of a Box Tortoise, which, beside differing from the com- 
. mon box tortoise of North America, in being of a more elongated 
form, both agree in two characters, which are not found in that 
species or in any other species of the genus; first, in having an 
additional vertebral plate ; and secondly, im the hind feet being only 
armed with three large claws: there is no appearance of the fourth 
claw, and even scarcely any rudiment of the fourth toe found im the 
other specimens of this genus, and in all other Himyde. 
This species will form a section or subdivision of the genus, which 
may be called Onychotria. 
Cistupo (OnycuoTRriA) Mexicana. Three-toed Box Tortoise. 
Shell oblong, dark-brown, pale, spotted and rayed, spot and rays 
sometimes confused. 
Vertebral plates with a nearly continued keel, and with a small 
intermediate one between the usual fourth and fifth plates. 
The hinder margin acute revolute. 
The head pale brown; the legs yellow or orange spotted, with five 
unequal claws. 
The hind legs brown, uniform, with only three large claws, the 
middle and the front one largest. 
The sternum flat; the gular plates wide in front, and suddenly 
narrowed behind. 
Hab. Mexico. 
There was a specimen of the Kinosternon scorpiodes, and of the 
Gopher, Testudo gopher, in the same collection: the latter only dif- 
fered from the usual North American specimen in being rather larger 
and. blacker. 
February 27.—William Yarrell, Esq., Vice-President, in the Chair. 
The following paper were read :— 
1. DESCRIPTION OF SEVEN NEW SPECIES OF MARGINELLA. 
By Joun 8S. GaAsKoIn. 
MARGINELLA QUADRILINEATA. Marg. testd oblongo-ovatd, pal- 
lidé virescente, nitidd; lineis rufis quatuor, equidistantibus, 
transversis ; basi rotundatd, levi; aperturd latd antice pre- 
cipue; canali latissimo ; labio lato, marginato, ultra apicem 
extenso; columelld anticé quadriplicatd, plicis duabus anticis 
concurrentibus canalem intermediam formantibus ; apice oblito. 
Shell oblongo-ovate, of an uniform, opaque, pale-greenish colour, 
highly polished, with four distinct, nearly equidistant, very narrow, 
uninterrupted, even, red lines or bands, surrounding the shell from 
the upper or outer edge of the incrassated margin of the lip, which con- 
tinuing within the columella, extend over the earliest formation of 
whorls: these lines are equally conspicuous on the inside of the last 
whorl, and no doubt throughout the whole inside of the shell. The 
same pale-greenish colour pervades the inside as the outer part ; base 
