130 BULLETIN OF THE 



a longer style, and fifteen instead of twelve teeth around the rim of the 

 hydi'otheca. 



32° 7' N., 78° 31' 30" W., 229 fms. 



Cryptolaria abies, All. 



A specimen of C. abies bears a structure which I have called the gonosome. 

 The distal end of a piuna, 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- 

 thecae. Nothing else which can be likened to a gonosome has been described 

 in C. 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: — Ilydrocaulus smooth, non-fascicled, pinnately branched, with 

 root like base. Hydrotheca) borne on main stem and branches. Height, six to 

 eight inches. Pinna? alternate, zigzag, and jointed. Hydrotheca) alternate. 

 A single hydrotheca arises from the axil of every pinna. Number of hydro- 

 theca) on the stem between the pinna), variable. Hydrothecoe extend almost 

 at right angles to the axis of pinna, and arise from distal ends of each jomt. 

 Margin of the hydrotheca smooth, upper surface or face without indentations. 



Gonosome 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, All. 



Grenada, 170 fms. ; Martinique, 357 fms. 



Plumularia caulitheca, n. s. 



P. caulitheca, unlike other species of riumularia, has a large ncmatophore, 

 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. 



'i'roi)liosome : — Hydrocaulus simple, fascicled, two inches high. Pinna3 

 alternate. Hydrotheca) deep, with smooth margin. Nematoplioies free. Me- 

 sial nematoi)hores arise from a slight protuberance below the hydrotheca. 

 Normal nematophores trumpet-shaped and free. 



Gonosome unknown. 



Grenada, 110 fms. 



This species differs from P. attcmuitii, All., in the possession of a peculiar 

 nematoi)h(jre seated on a projection of the stem from which the jjinna rises. 



