The works of Francis Maitland Balfour, Volume 2 (of 4)

by Francis M. Balfour

I. Gephyrea nuda.

(1) Inermia.

(2) Armata.

II. Gephyrea tubicola. (Phoronis).

[150] The fact that these pouches are outgrowths of the alimentary tract appears to preclude the possibility of their being homologous with excretory tubes of the Platyelminthes and Rotifera.

[151] Kowalevsky states that what I have called the mouth is the anus, but his subsequent descriptions shew that he has transposed the mouth and anus in the embryo, and that the opening, which he asserts to be the anus, is in reality the mouth.

CHAPTER XV.

CHÆTOGNATHA, MYZOSTOMEA AND GASTROTRICHA.

The present chapter deals with three small isolated groups, which only resemble each other in that the systematic position of all of them is equally obscure.