The deveIopment of germ cells in the scallop, Ohlamys farreri(Jones et Proston)can be divided into five stages as follows: Female germ cells:(1) flogonium stage, (2) yolkless stage, (3) eary yolk--fororation stage, (4) Iate yolk-formation stage and (5) maturate stage. Malo germ cells:(1) spermatogonium stage, (2) primary spermatocyte stage，(3) secondary spermatocyte stage, (4)spermatid stage and (5) spermatozoan stage. The annual cycle of maturation can he divided, by the cytological characteristics of the developing germ cells and the relative amounts of germ Bells, into the following five periods:(1) proliferation period, Tanuary to lyiarch, (2) growth period,April to May, (3) maturation perod, May to September, (4) Spawning period, May to October and (5) resting period, November to December. There are two spawning peaks in a year, i. e, the middle of May to Tune and the and of September to October. The gonad index(%)(gonad weight/soft body weight) increases rapidly from April and reaches。maximum value in August. After spawning, the index value drops down to a minimun value in November, and rises again gradually thereafter. The maturation of the gonads and the spawning period of this scallop are closely ralated to temperature. A hermaphrodite specimen was discovered and examined.