430 
America in the “ Monograph,” has been found by Dr. Humphrey 
in Jamaica, W. I. (cf. Phyc. Bor. Am., No. 54), and by the writer 
at Salisbury, Conn., and in two localities near New Haven, Conn. 
(cf: ibid., No. 54). It grows attached at first, but later floats free. 
L. Lagerheimii (Moeb.) Gomont. A very slender species dis- 
tinguished by being fairly regularly twisted into a loose spiral, 
previously found only in Brazil, has reappeared in Southern New 
England. The species grows in brackish water in a small pool 
near Norwich, Conn., and in Little Pond, Falmouth, Mass. In 
each case it was growing upon Cladophora expansa and in one 
case was associated with Scenedesmus caudatus and various des- 
mids, while in the other it grew with Chara crinita and Glocotrichia 
Pisum. It also grows somewhere near New Haven, as consider- 
able quantities of it appeared in an aquarium in the Biological 
Laboratory of the Sheffield Scientific School. 
Phormidium Valderianum (Delp.) Gomont. This is another in- 
teresting species found in Watch Hill Pond, R. I. It grows in 
fresh water in Europe and forms expanded, lamellose strata on 
rocks and plants. In this locality, it forms a verdigris-green gela- 
tinous cylindrical covering to the elongated stems of Ruppia mart 
tama. It is common to find along the shore of the pond Ruppia 
stems partially dried and then the Phormidium layer is papery 19 
texture. 
Arthrospira Jenneri Stiz. is not credited to this country by 
Gomont. It is a large form and unmistakable. It has been found 
by Mr. Isaac Holden in some abundance near Schenectady, N.Y. 
ARTHROSPIRA GOMONTIANA n.sp._ For several years Mr. Isaac 
Holden and the writer have found in the vicinity of Bridgeport, 
Conn., scanty material of an Arthrospira which appeared to be 
different from any previously described. In June, 1895, howevet, 
a considerable quantity was found and sufficient material was Pre 
served for future distribution and study. 
This species makes its home in a pool of fresh water near 
Factory Pond in the northern part of Bridgeport, and floats ase 
the surface in verdigris-green patches of comparatively small size, 
resembling very much the so-called « Wasser bliite” of Anabaena 
flos-aquae, Gloiotrichia Pisum, etc. The floating masses are made 
up of small flocculent bits, each of which contains a considerable 
