caudad

Body narrowing caudad, becoming narrow and pointed at posterior end.

Unpaired tentacle situated well caudad, more slender than the paired ones but nearly as long.

As this groove is followed caudad its ventral wall is seen to become much thickened, tg, to form the anlage of the thyroid gland.

Figure 4G is about fifty-five sections caudad to the preceding figure, and passes through the middle region of the heart, ht.

Figure 4B represents the eighteenth section caudad to the one just described.