56 
land Marine Alg?e, PI. vi., Fig. i. My specimens were collected in- 
June, at Nahant, Mass., where the plant seems not to be very rare. 
Ralfsia deusta, Ag., reported in America only from Eastport, 
Maine, I found at Marblehead, Mass., near the Clifton House. It 
grew just at and a little below low water-mark, in company wuth 
Corallina and Lithothavinion. The growing plant is rather handsome, 
and quite distinct from other species of the genus, but in drying it 
loses much of its character. 
Ralfsia verrucosa, Aresch., I found at East Chop, Martha's Vine- 
yard, last September; and also 
Petrocelis cruenta, Ag. Neither species has been reported as 
found south of Cape Cod. I found them after a severe gale, which 
had washed up large quantities of algae. These two species were on 
pebbles on which Phyllophora Brodim was growing, and had apjxir- 
ently come from deeper water. Both were without fruit, and were 
smaller than the common northern forms. 
Calliihamnion membranaceum, Magnus. — This curious species, 
which is quite common in Massachusetts Bay, is much the smallest 
of the genus, and its habitat is a very unusual one for one of the 
Floride3e._ It grows in the interior of polyzoa, sponges, and some- 
times of siphonaceous algje. In spring and summer, Laminarias and 
Agarums will not uncommonly be found covered with a Sertt/iada, 
which, instead of being white or yellowish, is bright red, being filled 
with a dense mass of Callithanwion. This species was discovered in 
1872 in the German Ocean, by Dr. P. Magnus, and described and 
figured by him in Die Botanischen Ergebnisse der Nordseefahrt, Ber- 
lin, 1874. What is probably the same plant was found' on the Mas- 
sachusetts coast by Dr. P. F. Reinsch, and described and figured in 
the BotaniscJieZeitung for Jan. 10, 1879, but no name was given to 
It The position of the tetraspores in Reinsch's figure differs some- 
what frorn that in Magnus's. All the fertile specimens I have found 
agree with the latter, and k specimen which I sent to Dr Magnus is 
pronounced by him perfectly identical with the European plant. It 
IS reported by Hauck as found in the Adriatic, and is probably quite 
generally distributed, but has escaped^otice from its minuteness and 
place of growth. 
Maiden, Mass. ^^^^^ S. Collins. 
Thalictrum anemonoides or Anemone thalictroides, which ? 
Ur Gray, in his Manual, has placed the rue-anemone in the genus 
iv A^"''' ""'^^ ^'^ ^'^' ^^^^" generally followed in this country. 
Wood, however, places it, in his Botanist and Florist, in Ancmcie, 
andlieis,! think, correct in doing so. It differs essentially from 
l/ialictrtim m having an involucre, and agrees in all respects with 
Anemone except that Dr. Gray makes the arbitrary distinction 
^^achenia * * * not nbbed." Omit the not. and lef it read 
achema pointed or tailed, flattened or ribbed,"' and the generic 
anemnr\? ^-v//.//.. of Dr. Gray will fit admirably the rue- 
nn^T^.;. .fV^^^»^^^les in a striking manner the Anemone nemorosa, 
7?i//.ri.<.^- '""'■' ".'^'^^ related in every respect than Anemone 
Jiepatica is. Since making my note to this effect, I find that Bentham 
