BIOLOGICAL SURVEY OF WOODS HOLE AND VICINITY. 



481 



part consists of mud or fine muddy sand. Mud and fine sand furnish poor attachment 

 for algae, and their shifting nature, especially when disturbed by storms and tide currents, 

 give conditions very unfavorable for algal growth. The water is relatively shallow in this 

 region, occasionally more than 7 fathoms deep, but generally under 6 fathoms. The 

 following species were found growing in the upper portion of the Bay, the numbers refer- 

 ring to Fish Hawk stations : 



Arlhrocladia villosa, 7653, few. 



Chordaria flagelliformis, 7653 and 7654, few. 



Desmarestia aculeata, 7653 and 7655, few. 



Desmarestia viridis, 7653 many; 7654, few. 



Laminaria Agardhii, 7653 and 7654, few. 



Ralfsia clavata, 7639, few. 



Sargassum Filipendula, 7630 (1907), 7639, and 



7654, few. 

 Agardhiella tenera, 7615, 7632, 7645, 7648, 7649, 



and 7650, few. 

 Callithamnion Baileyi, 7653, few. 

 Ceramium tenuissimum , 7652, few. 

 Champia parvula, 7610 (1907), 7653 and 7654, many; 



7630 (1907), 7648 and 7651 (1907), few. 

 Cystoclonium pnrpurascens, 7653 and 7654, few. 

 Cystoclonium pnrpurascens var. cirrhosum, 7639 



and 7653, few. 

 Dasya elegans, 7632, few. 



The lower portion of Buzzards Bay presents conditions more varied than the upper 

 portion. The depth is generally over 8 fathoms, and all of the stations of the greatest 

 depth in the Bay (10 to 19 fathoms) are found in this region. The nature of the bottom 

 changes near the entrance of the Bay from mud and sand, characteristic of the upper 

 portion, to gravel and stones, present at a number of stations (7664, 7665, 7666, 7667, 

 7670, 7671,7672,7673). This is a much more favorable bottom for algae, and the number 

 of species and total quantity of vegetation are very much greater than in the upper 

 portion of the Bay. The following species were found in the lower portion of the Bay : 



Griffithsia tenuis, 7632, few. 



Grinnellia americana, 7621, 7628, 7629 and 7648, 



many; 7615, 7624, 7625, 7630, 7632, 7634, 7635, 



7639, 7649 and 7653, few. 

 Lithothamnion polymorphum, 7621, few. 

 Lomentaria uncinata, 7632 and 7653, few. 

 Phyllophora Brodisei, 7610, 7611, 7613, 7614, 7615, 



7617, 7618, 7627 and 7654, few. 

 Phyllophora membranifolia, 7635, many; 7610 



(1907), 7621 (1907), 7630, 7630 (1907), 7631, 7632, 



and 7639 (1907), few. 

 Polysiphonia nigrescens, 7648,7654,and 7655, many; 



7610, 7615, 7636, 7637, 7638, 7639, 7649, and 7650, 



few. 

 Polysiphonia variegata, 7632, few. 

 Rhodomela subfusca, 7639 and 7652, few. 

 Rhodymenia palmata, 7653 and 7656, few. 



Chorda filum, 7656, few. 



Chordaria flagelliformis, 7656, many; 7667, few. 



Desmarestia aculeata, 7656, 7657, 7662, and 7671, few. 



Desmarestia viridis, 7665, few. 



Dictyosiphon hippuroides, 7656, many. 



Ectocarpus fasiculatus, 7656, many. 



Laminaria Agardhii, 7656 and 7657, many; 7660, 



7662, and 7663, few. 

 Laminaria Agardhii var. vittata, 7670, many; 7664, 



7665, 7666, 7667, and 7671, few. 

 Ralfsia clavata, 7671, few. 

 Sargassum Filipendula, 7657, few. 

 Agardhiella tenera, 7661, few. 

 Ahnfeldtia plicata, 7656, few. 

 Antithamnion cruciatum, 7671, few. 

 Callithamnion Baileyi, 7656, many. 

 Ceramium rubrum, 7656, many; 7665 and 7670, few. 

 16269° — Bull. 31, pt I — 13 31 



Champia parvula, 7661, 7662, and 7663, many; 7656, 



7657, 7664, 7668, 7670, 7671, and 7672, few. 

 Chondrus crispus, 7656 and 7659, many; 7663, 7665, 



7668, 7670, 7672, and 7673, few. 

 Corallina officinalis, 7663, many. 

 Cystoclonium purpurascens, 7656, 7659, and 7660, 



few. 

 Cystoclonium purptu-ascens var. cirrhosum, 7651 



(1907), 7656, 7659, 7662 (1907), 7664, 7666, 7672, 



and 7673, few. 

 Dasya elegans, 7656, 7666, 7674, and 7675, few. 

 Delesseria sinuosa, 7664, few. 

 Grinnellia americana, 7671, many; 7660, 7661, 7663, 



7670, and 7675, few. 

 Lithothamnion polymorphum, 7659, few. 

 Lomentaria uncinata, 7671 and 7675, few. 

 Melobesia membranacea, 7672, many. 



