65MB per Oracle Connection?

I am running Oracle on NT 4 SP5. Every dedicated server process takes 65MB of memory! Does anyone know why so much memory is being allocated per process? Any help would be appreciated! Here is the error message I get:

ORA-04030: out of process memory when trying to allocate 62500000 bytes (session heap,First curdef allocation)

Thanks

Matt

Here are my init.ora parameters:
db_name = PC06
instance_name = PC06
service_names = PC06.NETABACUS
db_files = 1024
open_cursors=999999999
control_files = ("D:\Oracle\oradata\PC06\control01.ctl", "D:\Oracle\oradata\PC06\control02.ctl")
db_file_multiblock_read_count = 8
db_block_buffers = 600
shared_pool_size = 80000000
log_checkpoint_interval = 10000
log_checkpoint_timeout = 1800
processes = 50
parallel_max_servers = 5
log_buffer = 32768
#audit_trail = true # if you want auditing
#timed_statistics = true # if you want timed statistics
max_dump_file_size = 10240 # limit trace file size to 5M each
# Global Naming -- enforce that a dblink has same name as the db it connects
to
global_names = true
# Uncomment the following line if you wish to enable the Oracle Trace
product
# to trace server activity. This enables scheduling of server collections
# from the Oracle Enterprise Manager Console.
# Also, if the oracle_trace_collection_name parameter is non-null,
# every session will write to the named collection, as well as enabling you
# to schedule future collections from the console.
# oracle_trace_enable = true

oracle_trace_collection_name = ""
# define directories to store trace and alert files
background_dump_dest = D:\Oracle\admin\PC06\bdump user_dump_dest = D:\Oracle\admin\PC06\udump db_block_size = 4096
remote_login_passwordfile = exclusive
os_authent_prefix = ""
distributed_transactions = 10
compatible = 8.1.0
sort_area_size = 66560 Received on Thu Jun 01 2000 - 00:00:00 CDT