Yes looks like Jane born and reg before Marriage;
Birth Reg;
CANNING, JANE mmn MEARNS*****
GRO Reference: 1854 D Quarter in CASTOR Volume 07A Page 512
Trish

EDIT it looks to me John Cann* may have been married before;
CANNING, MARY mmn KENNEY
GRO Reference: 1852 J Quarter in GAINSBOROUGH Volume 07A Page 600
JOHN 1854 has mmn as Kenney also
Just to confirm Reuben 1864 had mmn as Means*