Figure 1: Semithin section of ovotestis of younger Macrochlamys indica. (A) An acinar portion showing various developing stages (white arrow) of only spermatogenesis. The Sertoli cell pockets separate different forms of spermatogenic development (black arrow). (B) Elongated columnar Sertoli cells are lined on the acinar inner wall and spermatocyte is located between the Sertoli cells. (C) Oval interstitial cells (white arrow) at interacinar zone and thin periacinar cells (arrow head). Enlarged view of an acinar portion showing outer boundary wall and many periacinar cells are in box. (D) Transmission electron micrograph of ovotestis of younger snails, showing typical spermatogonial cells with numerous mitochondria (bold arrow), membrane-bound vesicle (arrow head) and junctions of adjacent cells (thin arrow) ad = acinar boundary; ia = interacinar zone; S = Sertoli cell; sc = spermatocyte; sg = spermatogonia.