Ascidia

This gap was filled some years ago by the discovery of the lancelet -- _Amphioxus_ -- and the young of the sea-squirt -- _Ascidia_.

The World's Greatest Books — Volume 15 — Science Various 1909

Ascidia afford another instance of this periodicity, though ordinarily they are by far too rare to show any regularity in their distribution.

Species and Varieties, Their Origin by Mutation Hugo de Vries 1891

Ascidia of the white clover have been found in numbers, in my own experiment-garden, but always in the springtime.

Species and Varieties, Their Origin by Mutation Hugo de Vries 1891

Ascidia of the snake-plantain or _Plantago lanceolata_ are narrow tubes, because the leaves are oblong or lanceolate, while those of the broad leaved species of arrowhead, as for instance, the _Sagittaria japonica_, are of a conical shape.

Species and Varieties, Their Origin by Mutation Hugo de Vries 1891

Ascidia are far more common than is usually believed.

Species and Varieties, Their Origin by Mutation Hugo de Vries 1891

We will now compare the embryonic development of the two animals, and find to our great astonishment that the same embryonic form develops from the ovum of the Amphioxus as from that of the Ascidia -- a typical chordula.

The Evolution of Man — Volume 2 Ernst Heinrich Philipp August Haeckel 1876

As a fact, even in the Ascidia the mouth (o) opens first into this wide branchial sac.

The Evolution of Man — Volume 2 Ernst Heinrich Philipp August Haeckel 1876

Man's ancestors have substantially the organisation of a simple unarticulated Chordonium (Copelata and Ascidia-larvae).

The Evolution of Man — Volume 2 Ernst Heinrich Philipp August Haeckel 1876

In the Ascidia-larva, also, the chorda develops from the dorsal middle part of the primitive gut, while the two coelom-pouches detach themselves from it on both sides.

The Evolution of Man — Volume 2 Ernst Heinrich Philipp August Haeckel 1876

It then divides into two sections, a fore or branchial gut and a hind or hepatic gut, like the alimentary canal of the Balanoglossus, the Ascidia, and the Amphioxus.

The Evolution of Man — Volume 2 Ernst Heinrich Philipp August Haeckel 1876