中文摘要：

文中通过对三叶虫身体尾部构造及其功能与其它节肢动物如昆虫类、肢口类等动物的腹部和尾部等比较后,提出将具有内脏器官和体节的“尾部”修订为腹部,在其后由背壳愈合而成的单一硬板,其内部不具内脏器官者,划为三叶虫的真正尾部。因而三叶虫身体可分成头部（cephalic region）、胸部（thoracic region）、腹部（abdominal region）和尾部（pygidium region）四部分,它不仅与有关节肢动物命名一致,也符合一般动物身体器官分化规律。

英文摘要：

In the present paper, through the comparison between the structure and its function of the pygidial region of trilobites with those of some other classes of Arthropoda, a proposal is put forward that the body of trilobite is divided into four parts： the cephalic region, thoracic regi abdominal region and pygidium region, t maintaining the unity of naming the divisions of body of trilobite and some other named division the class of Arthropoda. It also conforms to universal law of heteronomous metamerism Arthropoda. on, hus the s of the of