In the Malacostraca it is absent in the adult, or persists only in a vestigial condition, as in some Decapoda and Schizopoda.
The former still persists unchanged, while the Bible is read and exhortations are given in Arabic; and priests may still be ordained after marriage.
If the tax-payer declines to pay his due, he is brought before the proper authorities by the tahsildar; if he persists in his refusal, all his goods, except those indispensable for his dwelling and the pursuit of his trade, are sold by auction, without recourse to a judgment by tribunal.
The latter pair alone persists in all other genera.
Another departure from the normal is that in which the juvenile or seedling form of shoot persists in the adult tree; the numerous coniferous plants known as species of Retinospora are examples of this.