Expecting IDENTIFIER in Signals

Hey all,

I've googled this problem and it always seems to be a missing semicolon or paren somewhere, but I've looked over my code and I see nothing. I know it's going to be simple and I will feel stupid, but I am just learning VHDL and going by the book. What is wrong with my signal declaration here?

library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
use ieee.numeric_std.all;
-- Processor
-- Mainly based off of Ch 4 in the CArch book
entity jaggy is
    port (CLK, pwr, instrin: in std_logic);
end jaggy;
architecture struct of jaggy is
    -- Signals to interconnect components
    signal(
    d1, d2, d3, d4, d5, t1 : std_logic;
    a1 : std_logic_vector(7 downto 0); 
    i1 : std_logic_vector(31 downto 0)
    );
begin
    -- Entities will be instantiated here
    -- Program Counter
    pc: entity work.prog_count port map(addrin => i1, addrout => a1);
    -- Instruction Memory
    im: entity work.instr_mem port map(PC => a1, instr => i1);
    -- Register File
    reg: entity work.reg_file port map(instrin => i1, dataout1 => d1, dataout2 => d2, memout => d3, datain1 => d4, datain2 => d5);
    -- ALU
    alu: entity work.arith_log_unit port map(datain1 => d1, datain2 => d2, dataout => d4);
    -- Data Memory
    dm: entity work.data_mem port map(addrin => d4, datain => d3, dataout => d5);
    
    -- Control Unit
    cu: entity work.contr_unit port map(t1);
end struct;

** Error: D:/jaggy.vhd(14): near "(": (vcom-1576) expecting IDENTIFIER.