41 
cells, and jointed at regular intervals, cells alternate or paired, biserial, sessile, urceo- 
late, short with averted apertures, ovarian vesicles scattered, polypes hydraform. 
S . polyzonias. Lin. syst. Loosely branched, cells alternate, with a wide avert¬ 
ed four-toothed aperture; vesicles egg shape, and wrinkled across. 
No. 259. S. polyzonias, var. A. Vesicles round. 
On shells and like-hedges below low water mark, thrown on shore at Jersey City, and other parts of 
the Bay. 
No. 270. S. pumila. S. Doody. Cells opposite, approximate, shortly tubu¬ 
lar; the top everted with an oblique mucronated aperture, vesicles ovate. 
On rocks and on Fucus vesiculosus, above and near low water mark, at Hurlgate, Castle Garden, Staten 
Island, and other places, abundant, about 1 inch long. 
No. 271. S. pumila. The same in clusters as it grows on Fucus. 
No. 272. S. argcntea. Merret. Cells nearly opposite, or sub-alternate, ur- 
ceolate, acutely pointed, the upper half spread out, vesicles oval, polypidom caulife- 
rous. 
On shells and rocks in deep water, in the Channel, at the Narrows, ofFStaten Island, and Kill Van Kull; 
thrown on shore in great abundance at all parts of the Bay; large clusters attached to twigs and bark from 
fike-hedges, are thrown on shore at Jersey City. 
No. 272 A. S. cupressina , of Ellis and other authors ; but I regard it as a va¬ 
riety of S. argcntea , in one of its very sportive forms. 
Genus, LAOMEDEA. Lamour. 
Root of creeping fibres; jointed at regular intervals, the joints ringed, incras- 
sated, giving origin alternately from opposite sides, to the shortly pedicled cells ; ve¬ 
sicles axillary, polypes hydraform. 
No. 273. L. dichotoma. Ellis, Filiform, incrassated below the joints and 
ringed above them, branches alternate, cells on ringed tapered pedicles, ovarian cap¬ 
sules axillary, ovate, smooth. 
At and below low water mark on shells, rocks, and sticks; drifts on shore at Red Hook, Fort Hamil¬ 
ton, and other places ; rare. 
No. 274. L. dichotoma, var. B. 
More slender and elongate, drifted on shore at Jersey City, and other places. 
No. 275. L. gcniculata. Doody. Stems zigzag, not much branched, cells on 
annular stalks from the joints, with an even rim ; vesicles axillary, ovate. 
At low water mark on like hedges, and on rocks and shells, very abundant in autumn. 
No. 276. L. gelatinosa. Dillenius. Filiform, elongate, branched, branches 
spreading at wide angles ; cells on long pedicles, with an even rim. 
On stones and wood near low water mark, at Kavon Point, Fort Hamilton, and elsewhere. 
