8oo 



BULLETIN OF THE BUREAU OF FISHERIES. 



Isactis plena (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, Woods Hole (W. G. 

 Farlow); P. B.-A., fas. iv, no. 1563, Cutty- 

 hunk, August 3, 1894 (W. A. Setchell). 



Ri-vularia atra Roth. 



Common, on rocks, stones, and barnacles, be- 

 tween tide marks. 

 Woods Hole: 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 Spariina 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. 26ob, 



Quamquisset Harbor, Falmouth, July and 



August, 1891 (W. A. Setchell). 



Rivularia polyotis (J. Agardh) Bornet & Flahault. 

 Cohasset Narrows (Farlow). 



Farlow, 1881, p. 38, 39 (Rivularia hospita Thuret). 

 Cohasset Narrows. 



CLASS CHLOROPHYCE^E. 



Order PROTOCOCCALES. 



Family PALMELLACE^. 



Glozocystis 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 (Glaeocapsa zostericola 

 Farlow), Woods Hole, August, 1881; A.A.B. 

 Ex., fas. V, no. 230, \Glasocystis chrysophtlialma 

 (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 ULOTRICHALES. 



Family ULOTRICHACE^. 



Ulotkrix 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 algse, 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. LXXVIII, 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 inteitinalis (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. 



