488 



BULLrETlN OP THE BUREAU OF FISHERIES. 



to 49) comprises various reefs that lie off Gay Head, and especially the ledge known 

 as Devils Bridge; these rocks are in 2 to 5 fathoms and the bottom between them is 

 sandy. The third zone (stations 56-60, 7581 and 7731) is in deeper water outside of 

 the reefs and has a rocky, gravelly, or sandy bottom in 5 to 1 2 fathoms. These zones 

 will be considered in order. 



The first zone (stations 50 and 51) in shallow water was studied August 9, 1904. 

 It comprised the following species, chiefly growing on rocks : 



Calothrix scopulorum (on piles). 

 Chsetomorpha area (on piles). 

 Cladophora albida var. refracta. 

 Enteromorpha intestinalis. 

 Enteromorpha prolifera. 

 Ulva Lactuca var. rigida. 

 Chorda filum. 

 Chordaria flagelliformis. 

 Desmotrichum undulatum (on Zostera). 

 EctocaqDus fasciculatus (on larger algae). 

 Ectocarpus siliculosus (on larger algae). 

 Fucus evanescens. 

 Fucus vesiculosus. 



Fucus vesiculosus var. sphaerocarpus. 

 Laminaria Agardhii. 

 Laminaria digitata. 



Phyllitis fascia. 



Scytosiphon lomentarius. 



Ahnfcldtia plicata. 



Callithamnion Baileyi (on Chondrus). 



Ceramium rubrum (on Chondrus). 



Champia parvula. 



Chondrus crispus. 



Cystoclonium purpurascens var. cirrhosum. 



Nemalion multifidum. 



Pleonosporium Borreri (on larger algae). 



Polysiphonia fibrillosa. 



Polysiphonia nigrescens. 



Polysiphonia violacea. 



Rhodomela subfusca (on piles). 



Rhodymenia palmata. 



Spermothamnion Turner!. 



The second zone (stations 44 to 49) was also studied August 9, 1904. 

 species is as follows : 



The list of 



Chsetomorpha melagonium, 44 and 45, few. 

 Chorda filum, 47 and 49, few. 

 Desmarestia aculeata, 46, 47, and 48, few. 

 Desmarestia viridis, 46, few. 

 Ectocarpus siliculosus, 44 and 45, few. 

 Laminaria Agardhii, 44, 45, 46, 47, and 49, few. 

 Laminaria Agardhii var. vittata, 44, 45, and 47, few. 

 Laminaria digitata, 44 and 48, few. 

 Ahnfeldtia plicata, 47 and 49, man}'; 44, 46, and 48, 



few. 

 Ceramium fastigiatum, 44, few. 

 Ceramium rubrum, 44, 45, 46, 47, and 48, few. 

 Champia parvula, 49, many; 44, 46, and 47, few. 

 Chondrus crispus, 44, 45, 46, 47, 48, and 49, many. 

 Corallina officinalis, 47, many; 44, 45, and 48, few. 

 Cystoclonium purpurascens, 44 and 49, many. 

 Cystoclonium purpurascens var. cirrhosum, 44, 45, 



46, and 47, many; 48 and 49, few. 



Delcsseria sinuosa, 45, many; 46, few. 



Grinnellia americana, 49, few. 



Lomentaria rosea, 45, few. 



Melobcsia pustulata, 45, 46, 47, and 49, many; 44, 



few. 

 Phyllophora Brodiaei, 45, many; 44, 46, 47, 48, and 



49, few. 

 Plumaria elegans, 44, few. 



Polyides rotundus, 46, 47, and 48, many; 44, few. 

 Polysiphonia elongata, 44 and 45, many; 46, 47, 48, 



and 49, few. 

 Polysiphonia nigrescens, 49, many; 47, lew. 

 Polysiphonia violacea, 45 and 48, few. 

 Rhodymenia palmata, 45, 46, and 47, many; 44 and 



48, few. 

 Seirospora Griffithsiana, 49, few. 

 Spermothamnion Turneri, 44, 45, and 46, many; 47 



and 49, few. 



The third zone (stations 56-60, 7581 and 7731) was studied August 15, 1904. The 

 following list includes the species of the seven stations : 



Laminaria Agardhii, 57, 59, 60, 7581 (1907), and 



7731, few. 

 Laminaria Agardhii var. vittata, 57 and 7731, many; 

 59 and 60, few. 



Chaetomorpha melagonium, 56, 57, 58, and 60, few. 



Arthrocladia villosa, 56, many. 



Desmarestia aculeata, 57, many; 56, 59, 60, and 



7731, few. 

 Desmarestia viridis, 57. 58, 7731, and 7731 (1907), 



many; 59, few. 



Ralfsia clavata, 57, many; 56, 58, and 59, few. 

 Ahnfeldtia plicata, 60, few. 



