130 BULLETIN OF THE 
a longer style, and fifteen instead of twelve teeth around the rim of the 
hydrotheca. 
32° 7' N., 78° 31/ 20" W., 229 fms. 
Cryptolaria abies, Arr. 
A specimen. of C. abies bears a structure which I have called the gonosome. 
The distal end of a pinna, which in its proximal extent is normal, is modified 
into a spherical body, which resembles imperfectly this organ. In it, however, 
there are no gonophores. Its walls are formed by the elongation of the hydro- 
thecæ. Nothing else which can be likened to a gonosome has been described 
in O. abies. In none of the specimens were there structures similar to what 
Allman has described as the gonosome in Cryptolaria conferta. 
Sertularella formosa, n. s. 
Trophosome : — Hydrocaulus smooth, non-fascicled, pinnately branched, with 
root like base. Hydrothece borne on main stem and branches. Height, six to 
aight inches. Pinnæ alternate, zigzag, and jointed. Hydrothecæ alternate. 
A single hydrotheca arises from the axil of every pinna. Number of hydro- 
thecæ on the stem between the pinnæ, variable. Hydrothecæ extend almost 
at right angles to the axis of pinna, and arise from distal ends of each joint. 
Margin of the hydrotheca smooth, upper surface or face without indentations. 
Jonosome unknown. 
The mode of origin of the ultimate branches, the want of indentations on the 
upper surface of the hydrotheca, and the smooth stem, separate this species 
from Sertularella Gayi, var. robusta, AM. 
Grenada, 170 fms. ; Martinique, 357 fms. 
Plumularia caulitheca, n. s. 
P. caulitheca, unlike other species of Plumularia, has a large nematophore, 
not free as the others in the same species, which arises from the stem upon the 
upper side of a projection of the hydrocaulus from which the pinna springs. 
Trophosome : — Hydrocaulus simple, fascicled, two inches high.  Pinnæ 
alternate. Hydrothece deep, with smooth margin. Nematophores free. Me- 
sial nematophores arise from a slight protuberance below the hydrotheca. 
Normal nematophores trumpet-shaped and free. 
+onosome unknown. 
jrenada, 416 fms. 
This species differs from P. attenuala, All., in the possession of a peculiar 
nematophore seated on a projection of the stem from which the pinna rises. 
