Verrill, Notes on Hadiata. 285 



short, and flattened, diminishing to the end of the rays. The outer- 

 most two, lower, marginal plates bear a small rounded tubercle. The 

 plates of the upper surface are regularly arranged, polygonal, sur- 

 rounded by from six to ten pores, and bearing oblong, sessile pedicel- 

 lariie, which do not rise above the granules ; five of the plates around 

 the center, corresponding to the median line of the rays, are more 

 prominent and bear short, thick, round-topped, naked tubercles, form- 

 ing a pentagon ; from these a line of ten plates extends along the 

 middle of each ray, a few of them bearing one or two very small, 

 i-ounded tubercles. The middle of the disk is a little more elevated 

 than in the smaller specimen. 



Linckia. 



We follow Dr. Lvitken in retaining the name LincJcia (Nardo, in 

 part) for the group having the Asterias Imvigatu Linn, as its type, 

 not deeming its previous use in Botany a sufficient reason for reject- 

 ing it. This genus corresponds nearly with Linclda of Gray and 

 includes the typical species of ISTardo. It corresponds with the sec- 

 tion h of Ophidiaster in the "System der Asteriden" of Miiller and 

 Troschel. L. miifascialis departs considerably from this generic type, 

 and may ultimately require separation. 



For the genus Ophidiaster we take 0. ophidiamis Agassiz, as the 

 type, as most authors have done. Thus it corresponds to the group 

 as restricted by Gray and by Ltltken, and nearly to the section a of 

 Miiller and Troschel. 



For the group typified by Asterias variolata Lam., we have adopted 

 Gray's name, Nardoa^ which has two years priority over Scytaster of 

 Miiller uud Troschel, and has the same species for its type, although 

 some additional species were added to it by the latter authors. This 

 group corresponds in part to LincMa, of Nardo and of Agassiz, and 

 to Scytaster, as restricted by Liitken. 



Linckia unifascialis Gray. 



Linckia (Phataria) unifascialis Gray, loc. cit., 1840. 



Ophidiaster (Linckia) tmifascialis Liitken, Kritiske Bemaerk. om forskj. Sostjerner, 

 Vidensk. Meddelelser, 1864, p. 165. 

 ? Ophidiaster suturalis Miill. and Troschel, System der Asteriden, p. 30, 1842. 



We have received a large number of specimens of this species from 

 Panama and the Pearl Islands, and Zorritos, Peru, collected by Mr. 

 Bradley, and from Cape St. Lucas, collected by J. Xantus for the 

 Smithsonian Institution. Dr. Gray's specimens were collected by 

 Hugh Cuming in the Bay of Carracas, on rocks at low water. Dr. 



