The sign of Cancer is found on two consecutive house cusps: the fourth (IV) and fifth (V) houses.
Capricorn on two houses
The sign of Capricorn (Cancer's opposite sign) is also found on two consecutive house cusps -- on the 10th house cusp (Note: the Midheaven is the 10th house cusp) and on the 11th house cusp (XI). Note also that the degrees next to the sign's name are the same as those of Cancer.
Leo (Virgo) Libra
Note that Leo is on the cusp of the sixth (VI) house and Libra is on the cusp of the seventh (VII) house. Since Virgo comes after Leo, you can see that Virgo is "missing" or not represented on the houses of this chart. Virgo is said to be intercepted in the sixth house.
This also means that Virgo's opposite sign, Pisces, is not found on a house cusp in this particular chart.