470 BULLETIN OF THE BUREAU OF FISHERIES. 
THE WARM-WATER SUBLITTORAL FORMATION. 
A characteristic warm-water sublittoral formation is present during the summer 
in the more sheltered regions of the Bay and Sound—that is, in the upper portion of 
Buzzards Bay and in the narrow and easterly portions of Vineyard Sound. The con- 
ditions in these regions are much more varied than in the lower portion of the Bay and 
the westerly portion of the Sound occupied by the cool-water sublittoral formation. For 
example, the conditions and flora of the upper end of Buzzards Bay are quite different 
from those around Woods Hole. Further subdivisions of the warm-water sublittoral 
formation could undoubtedly be made to advantage, but it would be unwise to attempt 
to do so on our present information. Accordingly, we shall treat the warm-water 
sublittoral as a very large and widely distributed formation, excluding, however, those 
algee which are characteristically associated with beds of Zostera in an assemblage called 
here the Zostera formation (c). 
The species in these lists (as in those of the cool-water sublittoral formation) 
preceded by an asterisk (*) are the larger or more abundant forms which dominate 
the formation; species which are rare or occasional are followed by an (0). 
The most interesting and noteworthy species in the warm-water sublittoral forma- 
tion are those which have not been reported at all north of Cape Cod or are present 
there only under exceptional conditions. This list includes the following species: 
*Spermothamnion Turneri. 
*Spyridia filamentosa. 
Chondria dasyphylla. 
C. sedifolia (0). 
*Polysiphonia fibrillosa. 
P. vestita (0). 
Cladophora albida. 
Ectocarpus granulosus var. ten- 
1 MS Ce). 
E. lutosus (0). 
FE. Mitchell (0). 
Cladostephus spongiosus (0). 
S. Filipendula var. subedenta- 
tum. 
Scinaia furcellata. 
*Antithamnion cruciatum. 
A. cruciatum var. radicans (0). 
A. plumula (0). 
*C. verticillatus. Callithamnion Baileyi var. Rhodomela Rochei. 
Rhadinocladia Farlowii (0). laxum. R. virgata (0). 
Striaria attenuata (0). *C, roseum. Actinococcus aggregatus (0). 
*Arthrocladia villosa. 
Elachista stellaris var. Chorde 
(o). 
Myriactis pulvinata var. minor. 
Stilophora rhizodes (0). 
Sargassum bacciferum (0, float- 
ing in Sound). 
*S. Filipendula. 
C. tetragonum. 
Ceramium botryocarpum (0). 
C. capri-cornu (0). 
*C. tenuissimum. 
*Griffithsia tenuis. 
Pleonosporium Borreri. 
*Seirospora Griffithsiana. 
Gymnogongrus Griffithsiz (0). 
Gracilaria confervoides (0). 
G. multipartita. 
G. multipartita var. angustissi- 
ma (0). 
Hypnea muciformis. 
Lithothamnion polymorphum. 
Another group of species comprises those which range both north and south of Cape 
Cod, some of them being also conspicuous in the cool-water sublittoral formation (a). 
The list includes the following: 
Chetomorpha linum. 
Cladophora albida var. refracta. 
C. rupestris. Pylaiella littoralis. 
Bryopsis hypnoides (0). 
Sphacelaria cirrhosa. 
Ceareta: B. plumosa (0). S. radicans. 
C. glaucescens. *Fctocarpus confervoides. Punctaria plantaginea (uv). 
C. gracilis. *H. fasciculatus. Desmarestia aculeata (0). 
C. hirta (0). E. granulosus *Desmarestia viridis. 
C. lanosa. *E, siliculosus. Dictyosiphon hippuroides. 
C. Rudolphiana. 
E. siliculosus var. hiemalis (0). 
Myriotrichia filiformis. 
