 Each capsule measures about 55 mm (2.2 in) long and 12 mm (0.5 in) across, and contains 20–30 ova.Early-stage embryos have specialized teeth for opening the capsules, while later-stage embryos have their teeth hidden and swallow the capsules whole, their teeth not becoming functional again until just after birth.No evidence of sibling cannibalism has been found as in the sand tiger shark ("Carcharias taurus").