It is currently reported among the pearl hunters who fish the western and southern streams, that the finding of soft pearls is not infrequent. Upon opening the mussel, they sometimes see through the mantle of the creature, an apparently fine pearl which upon being taken out proves to be a soft jelly-like substance, the form of which is usually destroyed in squeezing it out. These men do not believe that a pearl is formed in layers, but think that all pearls are originally globules of a similar soft substance, hardening later to a compact solid ball and they call them "mussel eggs." Many pearls taken from the small thin-shelled varieties of the ocean mollusk, as for instance those of Venezuela, are devoid in part, or wholly, of the nacreous luster and instead have a china-like or waxy luster, or a dead chalky skin. A large proportion of the Abalone pearls and baroques are lustrous only in part, one section having an earthenware appearance. Many appear to be formed of interstratified layers of nacre and conchiolin. This construction is very distinct in a formation peculiar to the Abalone, consisting of two nacreous shells joined perfectly at the edges, the inside walls of both being covered with rough black conchiolin. Peculiarities in the quality of the nacre sometimes give an appearance of uneven shape which does not exist in reality. The light falling upon such pearls produces a knobby effect, as though there were protuberances on the surface. The texture of others is such that when looked at squarely from the front they appear pyramidal in form, the rounded apex pointing toward the observer. Such pearls have a soft, waxy appearance generally. Another common imperfection consists of pits in the surface. These may result from various causes: in many cases from the dislodgement and rolling of a pearl which has been flattened during earlier stages by pressure in one position against the shell. Freed from this hindrance to spherical growth, the later concentric layers would round over the edge of the flat spot and thereby leave a pit, or cavity, in the centre. In other cases pressure against the pearl, or the partial inclusion of foreign substances, especially of an organic nature which decay before being entirely covered, are possible causes. The reverse of this also occurs; grains of sand or other minute particles adhering to the surface are covered by succeeding layers, thereby producing knobs, more or less observable according to the lapse of time between their inclusion and the taking of the pearl from the oyster.