8oo 
bulletin oe the bureau of fisheries. 
Isactis plana (Harvey) Thuret. 
Common, on Punctaria, Fucus, Ascophyllum, 
rocks and old shells. 
Woods Hole: Grassy Ledge. Along Buzzards 
Bay shore. Cutty hunk (Setchell). 
Summer, probably at all seasons. 
A. A. B. Ex., fas. v, no. 222, W T oods Hole (W. G. 
Farlow); P. B.-A., fas. iv, no. 156a, Cutty- 
hunk, August 3, 1894 (W. A. Setchell). 
Rivularia atra Roth. 
Common, on rocks, stones, and barnacles, be- 
tween tide marks. 
Woods Plole: Juniper Point, Grassy Ledge. 
Black Rock. 
Summer, probably at all seasons. 
Rivularia atra — Continued. 
Farlow, 1873, p. 293, Woods Hole; A. A. B. Ex., 
fas. v, no. 221, Woods Hole in part (W. G. 
Farlow). 
Rivularia nitida Agardh. 
Common, on mud and roots of Spartina in salt 
marshes, between tide marks. 
Quisset Harbor. 
Summer, undoubtedly at other seasons. 
Farlow, 1881, p. 38 ( Rivularia plicata Carmi- 
chael), Woods Hole; P. B.-A., fas. vi, no. 260b, 
Quamquisset Harbor, Falmouth, July and 
August, 1891 (W. A. Setchell). 
Rivularia polyotis (J. Agardh) Bomet & Flahault. 
Cohasset Narrows (Farlow). 
Farlow, 18S1, p. 38, 39 ( Rivularia hospita Thuret). 
Cohasset Narrows. 
Class CHLOROPHYCE^E. 
Order PROTOCOCCALES. 
Family PalmeeeaceaJ. 
Glceocystis zostericola (Farlow) Collins. 
Common, on Zostera, forming slimy patches 
mixed with other microscopic algae. 
Woods Hole: Eel Pond. Quisset Harbor (Setch- 
ell). 
Summer. 
Farlow, 1882, p. 67, 68 ( Gloeocapsa zostericola 
Farlow), Woods Hole, August, 1881; A.A.B. 
Ex., fas. v, no. 230, [Glceocystis chrysophthalma 
(Montagne) Farlow], Woods Hole (W. G. Far- 
low); P.B.-A., fas. v, no, 219, 1896 [Glceocystis 
chrysophthalma (Montagne) Farlow], Quisset, 
July, 1893 (W. A. Setchell). 
Order ULOTR1CHALES. 
Family Ulotrichace^E. 
Ulothrix flacca (Dillwyn) Thuret. 
Common, on woodwork of wharves, stones, Fucus , 
etc., above low water. 
Woods Hole: Great Harbor, Grassy Ledge. 
Summer, undoubtedly at other seasons. 
Ulothrix implexa Kiitzing. 
Occasional, on rocks, above low water. 
Woods Hole: Grassy Ledge. 
Spring and early summer. 
Family UlvacE^. 
Enteromorpha clathrata (Roth) Greville. 
Abundant, in quiet water and pools, attached to 
stones, Zostera, larger algae, or floating in masses, 
frequently in brackish water. Dredged by 
the Survey, Vineyard Haven in 3 to 4 fathoms, 
over a shelly and muddy bottom. 
Woods Hole: Eel Pond, ditches of Penzance. 
Marshes of Quisset Harbor and Hadley Har- 
bor. Vineyard Haven, station 72, few. 
Summer, undoubtedly at other seasons. 
Farlow, 1873, p. 292, Woods Hole. 
P.B.-A., fas. d, no. exxviii, Eel Pond, Woods 
Hole, August 16, 1904 (F. S. Collins). 
Enteromorpha crinita (Roth) J. Agardh. 
Common, in pools and ditches of salt marshes. 
Woods Hole: Pools of Penzance. 
Summer. 
Enteromorpha erecta (Lyngbye) J. Agardh. 
Occasional. 
Woods Hole (Holden). 
Known only from specimens in the herbarium 
of the Marine Biological Laboratory, collected 
by Isaac Holden. 
Enteromorpha intestinalis (Linnaeus) Greville. 
Abundant, in quiet waters, attached to wood- 
work of wharves, stones, shells, etc., between 
tide marks. Dredged once by the Survey off 
Marthas Vineyard (station 61) in 5 fathoms, 
over a sandy bottom. 
Woods Hole: Eel Pond, Little Harbor, Grassy 
Ledge. Quisset Harbor. Hadley Harbor. 
Tarpaulin cove. 
Vineyard Sound: Inshore — Marthas Vineyard, 
station 61, few. 
Summer, ndoubtedly at other seasons. 
