Its oblong body ended in a very long caudal fin and its lateral fins in actual fingers.

它的长方身体后边是拉得很长的尾巴，它两侧的绪尖端就是指爪。

The lower, or resting-surface, resembles at first sight the ventral surface of an ordinary fish; it is of a white colour, less developed in many ways than the upper side, with the lateral fins often of smaller size.

下表面或静止表面， 乍一看类似于普通鱼的腹面；它是白色的， 在许多方面不如上面发达， 侧鳍通常较小。