AbstractThe perihelion longitudes of the Jupiter comets can be divided into two unequal groups, associated with (π4– 60°) and π4– 60°), respectively. This finding favors the authors earlier suggestion that many of these comets may have originated from the correspondingL5andL4Trojan clouds, which today are known to contain many hundreds of Trojans brighter than magnitude 20.9. The proposed origin of the Jupiter group comets is supported also by the finding that the preceding Lagrangian pointL5is associated not only with distinctly more Trojans but also with more comets thanL4, as well as by the association of the largest Trojans with the larger and denser cloud aroundL5. The larger size of theL5cloud is suggested by the association with it of a significant number of comets with smaller Jacobi constantsCthan those found in theL4cloud. All the observed distribution anomalies, of the Trojans as well as of the Jupiter group comets, would follow automatically from the assumption that both groups of bodies originated from two primordial clouds of matter associated with the equilateral regions. These two clouds would have been of unequal size and density, perhaps due to some initial by-chance irregularities in the uniformity of the relevant parts of the solar nebula. As to the long-range survival of volatile matter embedded in solids, certain observations encourage the assumption of such a possibility, while simplified theoretical considerations apparently do not suffice to produce any meaningful constraints.