A. E. Verrill—Radiata from the Coast of N. Carolina, 487 
some New England specimens, as well as in southern ones, 
although less frequently than in the latter. I have hitherto 
considered the two forms distinct species, but am now in pos- 
session of specimens from Vineyard Sound, Mass., which radase 
me to unite them. 
Oculina arbuscula V., Mem. Bost. Soc., N. H., i, p. 40. 
0. implicata V., op. cit, p. 41. 
Ace 
Physalia Arethusa Til. 
Parypha cristata Ag. (McCrady sp.) Piles of wharf. 
Hydractinia polyclina Ag. Common. 
Aglaophenia tryfida Ag. Very common. 
Dynamena cornicina McCrady. 
Diphasia s 
Srastarie: Sisiiaiiics V., sp. Ov. 
Stem long and slender, very flexible, giving off numerous 
slender, falcate branches, one to three ‘inches long, arranged 
8 irally. The branches are riety simply pinnate, but some of 
the lower ones are bipinnate, with the beret falcate. The 
hydroid cells are small, unequally alterate, rather clnele = 
pressed, with an oblique, slightly bilobed aperture. 
sules are stout elliptical, about four times as Mee as the vhwdroed 
cells, and with the breadth about one third of the len A swollen 
in the middle, narrowed toward the aperture, whic I 
simple, with the margin slightly uneven. Height Bike one foot. 
ECHINODERMS 
Thyone Briareus Sel. (Lesueur sp.) ‘Abundant. 
Pentamera pulcherrima Ayres. Four eipemrnge 
Thyonella gemmata V., gen. nov. (Pourt. 
> — matus Bots Proc. Am. Assoc., an shee be 
shy nepal Selenka, Zeitschrift fir Wissenschaftl. Zodl., xvii, 1867, 
Pp. 345, tab. xix, figs. 1 
is species differs so much in structure from the typical 
species of Thyonidium that it should form the type of a distinct 
genus. It has but ten tentacles, of which the two inferior ones 
nes. 
present on is thicker and filled with an csi large 
amount of calcareous plates. Other differences are to be f found 
in the oral plates, the genital organs, etc. 
eth Atropos ee. 1855. Common. 
he name Mera is preoccupied for a genus of Crus 
seis Tea the name of the present genus must, sievefor, 
ae pentapora Liitk. Brazil to Vineyard Sound, Mass. 
by ale | nat and Echinoderms, unless otherwise stated, were collected 
