112 
Orver IJ,—ULVACEA. 
1. Porphyra, Ag.—P. vulgaris, Ag. On rocks and stones. 
2. Bangia, Lyngb.—B. fuscopurpurea, Lyngb. On rocks, &c. 
3. Enteromorpha, Link.—Z. intestinalis, Link. On stones, &c., 
between tide marks.—Z. compressa, Grev. Onstones, &c., between 
tide marks. 
4, Ulva, L.—U. Linza, Linn. Rocks, &e.— U. latissima, Linn. 
Rocks, &c.— U. luctuca, Linn. 
5. Tetraspora, Link.— 7. /acunosa, Chanv. Fresh water streams. 
Orper III.—BATRACHOSPERMEZ. 
1. Batrachospermum, Roth.—B. monitiforme, Roth, Fresh 
water streams. j 
2. Lemanea, Bory.—Z. torulosa, Ag. On submerged stones ; 
Hamonassett River, Killingworth, Ct., ) W. #. 
Orpver IV.—CONFERVACEZ. 
1. Chetophora, Ag.— Ch. endiviefolia, Ag —Fresh water 
streams.— Ch. pisiformis, Ag. Fresh water streams and ditches. 
_ 2. Draparnaldia, Bory.—D. glomerata, Ag. Fresh water rivulet, 
New Haven, Prof. D. C. Eaton. 
3. Cladophora, Kitz—C. arcta, Dillw. On rocks in pools— _ 
C. rupestris, L. On rocks.—C. lanosa, Roth. On rocks; not 
common at New Haven.—C. refracta, Roth. In tide pools, &e.— 
C. albida, Huds. On stones and Algw.—C. Rudolphiana, Ag. 
» 4. Conferva, Link.—Several species of this genus are found here 
in fresh water streams, &c., but not yet determined. 
5. Spirogyra, Link.—At least two species have been found here 
in fresh water streams, by Prof. Eaton. 
6. Choetomorpha, Kiitz.—Ch. sutoria, Berk.— Ch. longiarticu- 
lata, Harv. Rock pools, Thimble Is., Prof. Eaton. 
7. Hormotrichum, Kitz.—H. Younganum, Dillw. On stones, 
&c., Savin Rock; not common. . : 
Orpver V.—OSCILLATORIACEA. 
1. Lyngbya, Ag.—Z. majuscula, Harv. 
2. Calothrix, Ag.— C. confervicola, Ag. Thimble Is.—C. scop- 
ulorum, Ag. Thimble Is. 
3. Oscillatoria, Vauch.— ,on stones in Mill River. Prof 
D. C. Eaton. - 
Orper VI.—NOSTOCHINEA. 
Nostoc, Vauch.—W. spheeroides, Rab. Pools; Whitneyville, 
Ct., and Beaver Meadows. Prof. D. C. Eaton. 
sep ani and Diatomacez.—These orders have not yet been 
studied. 
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