111 
3. Gracilaria, Harv.— G. multipartita, Ag., and var. angustis- 
_sima. On stones, &e. 
Orper V.—GELIDIACEA. 
Gelidium, Lmx.— G@. corneum, Lmx., var. crinale. On rocks, 
&c.; somewhat rare. 
Orper VI.—SPONGIOCARPEA. 
Polyides, Ag.—P. rotundus, Grey. 
Orper VII.—RHODYMENIACEA. 
1. Rhodymenia, Grevy.—R. palmata, Grev. Madison,. Ct., 
Falkner’s I., off Guilford, and New Haven, Ct. 
2. Rhabdonia, Harv.— Rk. Baileyi, Harv. (R. tenera, Ag., Soli- 
eria chordalis, Harv., in Ner. Am. Bor.) 
Orver VIIT.—CRYPTONEMIACEA. 
1. Phyllophora, Grev.—Ph. Brodiwi, Ag.— Ph. membranifolia, 
Ag. 
2. Ahnfeldtia, Ag.— A. plicata, Fries. 
3. Cystoclonium, Kiutz.— C. purpurascens, Kiitz. On Fuci, &e. 
4, Chondrus, Stack.— CA, crispus, Lyngb. On rocks between 
tide marks, 
5. Chylocladia, Grey.— Ch. Baileyana, Harv. Deep water; 
thrown up on shore. 
Orper [X.—SPYRIDIACEA. 
Spyridia, Harv.—S. filamentosa, Harv. 
Orprer X.—CERAMIACEA. 
1, Ceramium, Lyngb.—C. rubrum, Ag. On other Alga, Zos- 
tera marina, &¢.—C. strictum, Harv. On Algae, Zostera, &¢e.— 
C. arachnoideum, Ag., in Ner. Am. Bor, (C. fastigiatum, Harv.) 
On Alge, Zostera, &e. 
2. Ptilota, Ag.— Pri. elegans, Bonnem. On rocks and Fuei.— 
Pti_ serrata, Kutz. Thimble Is. Mrs. Davis: only once found. 
3. Griffithsia, Ag.—G. corallina? Ag. (G. tenuis, On 
Zosiera, &e.; not common. There is much doubt as tothe correct 
name of this species; it not yet having been sufficiently studied. 
4. Callithamnion, Lyngb.-—C. Paileyi, Harv.— C. Borreri, Ag. 
—C. byssoidewm, Arn.—C. corymbosum, Ag. On Zostera, &c.— 
C. versicolor, Ag., var. seirospermum, Harv. ( C. setrospermum, Griff.) 
—(. Americanum, Harv. Not uncommon: a most delicate and 
beautiful species.—C. eruciatum, Ag.—C. luxurians, Ag. (Chan- 
transia virgatula, Thur.) On Zostera, &e. 
Svecrass II CHLOROSPERME. 
Orprer I.—SIPHONACEA. 
Bryopsis Lmx.—B. plumosa, Lmx. In rock pools between tide 
marks, ; 
