1. This genus is characterized, in part, by the absence of anal spines on the females, except in one species, Terebra ovifelis.
这个属的特点之一是雌性个体的缺乏肛门棘,除了一种物种,Terebra ovifelis。
2. The terebra is exhaling its normal secretion - a milky white field of mud.
螺旋凿正在排放其正常的分泌物——一片奶白色的泥田。