[Excerpt from p. 136.] Itis not without hesitation that a new name has been considered necessary to accommodate the series of five specimens before me. The close relationship to G. pleyadella is obvious and it was first considered likely that the five specimens were but variations of that species. The smallest specimen approaches very closely to pleyadella in the shape of one ray (see plate) but the remaining rays are normal and characteristic of the other four specimens. In order to make an attempt to settle the question definitely, a loan of one of Bell's original specimens of P. validus, which was sunk as a synonym of pleyadella by Dr. H. L. Clark in 1909, was granted me by the authorities of the Museum of Comparative Zoology, Harvard, Cambridge, Mass., U.S.A.