SCANNING ELECTRON MICROSCOPIC OBSERVATION OF THE EGG ENVELOPE OF PLECOGLOSSUS ALTIVELIS DURING POST-OVULATORY AGEING

• TANG Xian-nian, 
• MIAO Liang, 
• LI Ming-yun, 
• AN Qin, 
• WANG Cheng-yi, 
• CHEN Jiong, 
• SHI Yu-hong, 
• LU Xin-jiang