BIOLOGICAL SURVEY OF WOODS HOLE AND VICINITY. 493 
of Enteromorpha clathrata, Sphacelaria radicans, Grinnellia americana, and Polysiphonia 
Harvey. Station 7762, in the middle of Vineyard Haven, had a bottom of mud and 
shells in 3% to 4 fathoms; there was an abundance of Agardhiella tenera, Champia par- 
vula, Grinnellia americana, Lomentaria uncinata, and small quantities of Dictyosiphon 
hippurordes, Sargassum Filipendula, Phyllophora membranifolia, Polysiphonia elongata, 
Spermothamnion Turnert, and Spyridia filamentosa. The bottom of such a harbor as 
Vineyard Haven always receives large quantities of drifted alge, some of which are able 
to vegetate loosely over the bottom; conspicuous among these are Champia parvula, 
Lomentaria uncinata, and Spermothamnion Turneri. The shallow regions support 
extensive beds of Zostera marina. 
Station 7761, off East Chop at the entrance to Vineyard Haven, with a bottom of 
sand, cinders, and shell fragments in 6 to 7 fathoms, gave much Sargassum Filipendula, 
Sphacelaria currhosa, Agardhiella tenera, Callithamnion roseum, Champia parvula, Lomen- 
taria uncinata, Phyllophora membranifolia, and Spermothamnion Turneri; in small quan- 
tities were Chordaria flagelliformis, Cladostephus verticillatus, Dictyosiphon hippuroides, 
Laminaria Agardhu, Chondrus crispus, Griffithsia Bornetiana, Grinnellia americana, 
Lithothamnion polymorphum, Phyllophora Brodiei, Polyides rotundus, Polysiphonia 
nigrescens, Rhodymenia palmata, and Spyridia filamentosa. 
(9) COVE WEST OF CUTTYHUNK NECK. 
A cove west of Cuttyhunk Neck (station ror) proved to be one of the most interesting 
stations in Buzzards Bay because of the abundance of Arthrocladia villosa. A special 
trip was made July 27, 1905, on the Genevieve of the Marine Biological Laboratory, one 
week after this station was discovered, to determine more precisely the habits of this 
interesting alga. Four hauls were carried across the eritrance of the cove from south- 
west to northeast in 4 to 5 fathoms. The bottom was sandy, with quantities of large 
clam shells (Venus mercenaria), mussel shells, and pebbles, to which the Avrthrocladia 
was attached in great abundance. ‘The plants were very large and in full fruit and 
supplied the set distributed in the Phycotheca Boreali-Americana, fas. D, no. Xxx. 
Besides the Arthrocladia, there was much Desmarestia aculeata, Laminaria Agardhii 
var. vitiata, Cystoclonium purpurascens var. cirrhosum, Grinnellia americana, Phyllo- 
phora Brodiei, and Polysiphonia elongata. In small quantities were found Chorda filum, 
Desmarestia viridis, Dictyosiphon hippuroides, Ectocarpus siliculosus, Laminaria A gardhii, 
Antithamnion cruciatum, Callithamnion roseum, Corallina officinalis, Polyides rotundus, 
and Scinaza furcellata. 
(10) THE MIDDLE GROUND. 
The shallow stretch in Vineyard Sound, known as the Middle Ground (stations 41, 
42, and 43), has a bottom of sand and broken shells, 2 to 41% fathoms at station 41, 
3% to 6 fathoms at station 42, and 21% to 5 fathoms at station 43. There was no evi- 
dence of algal life, and it is probably quite safe to say that no alge grow on these banks 
of shifting sand scoured by tidal currents. 
