八种鲤科鱼类脑的形态构造观察

本文描述了八种鲤科鱼类脑的外部形态和显微结构，并对不同水层鱼的脑进行了比较。鲤科鱼类的脑除了延脑有显著差异外，其它基本相似。鱼脑的形态构造不完全决定于分类系统，在很大程度上取决于它的生态环境和习性．因此，以鱼脑的形态构造差异，作为分类的鉴别特征是不适宜的。在生活习性相同的鱼类中，脑的形态构造越相似，其亲缘关系越近。

THE DESERYATION UN THE MCRPH4LaGY AND URGANIZA TION OF THE BRAIN OF EIGHT FRESHWATER CYPRINIDS

This paper describes the morphology and organization of the brain of eight fresh-water cyprinids by which inhabit in different layers of water.The brains of cyprinidsfishes have no obvious difference, axcept the medulla oblogata. The differences onmorphology the organization in the brain of cyprinids not quite depend on thetaxological system but to a great extent on their ecoenvironment and habit.Therefore, the differences have no significance to be taken as the distinctive featurein classification. The brain of the fish with the same hebit has more similarities inmorphology and organization.