Wiring a LM335

hello, i've two lm335 both TO-92 plastic package and cant find witch leg connects to where.
Sorry about the nob, but it seams everyone used LM35 or other sensor from Dallas, but i've this ones and would like to use them .
Can you help me ?

When looking to the datasheet it shows the following image :
(check following post )
he have tree legs (1, 2, 3 as picture ). Where do they connect :-?

Thanks,
Jose Alves

remaining data :
Image :

link http://www.flickr.com/photos/35026923@N04/3250240933
Datasheet :
National Semiconductor DS005698 datasheet pdf

it seems that this sensor is used in a potential divider, so you would use the circuit at the bottom of page 4 labeled basic temperature sensor and connect the output to an arduino analog pin. You coiuld then read this value and turn that into a temperature.