The body of the work, however, is fruitful in seminal ideas, though some statements may be rash and some conclusions extravagant.
F2, f 3, Lateral and caudal sb, Seminal pouch.
Each testis communicates by means of an efferent duct with a common collecting duct of its side of the body, which opens on to the exterior by means of a protrusible penis, and to which is sometimes appended a seminal vesicle.
These ducts therefore have not their exact counterparts in the Oligochaeta, unless we are to assume that they collectively are represented by the seminal vesicles of earthworms and the vasa deferentia.
In some cases while the original aperture remains undivided, the seminal groove is closed and so converted into a canal.