106 BULLETIN OF THE BUREAU OF FISHERIES. 
At least two of the foregoing species (WVembranipora tenuis and Hippothoa hyalina), 
while occurring with some frequency in the Bay, are restricted for the most part to the 
neighborhood of land. 
The preponderance of some of these forms in the Vineyard Sound records is prob- 
ably due in part to the relative imperfection of our data for Bryozoa from Buzzards 
Bay. Supplementary dredgings in the Bay, during the summer of 1909, revealed the 
presence of a number of species not hitherto found there, and indicated that certain 
others were not so scarce in this body of water as had been supposed. Indeed, it has 
been necessary to remove certain species from this second list which had earlier been 
placed there. Concerning the following species it is not believed that we have sufficient 
data to warrant any conclusions as to their relative abundance in the Bay and the Sound: 
Tubulipora liliacea. 
Membranipora monostachys. 
Bowerbankia gracilis. 
As a matter of fact all three of these species are recorded from an absolutely greater 
number of stations in the Sound than in the Bay. One of them (Membranipora mono- 
stachys) has been recorded in the latter only from the stations near land. 
Aside from the few cases mentioned, in which the occurrence of certain species in 
the Bay is limited to the inshore waters, there is nothing in the distribution of any of 
the species, so far as shown by the charts, which can be regarded as in any sense ‘‘bathy- 
metric.’’ Certain species which do not appear in our distribution charts, however, are 
restricted to shallow waters, or to the immediate neighborhood of land, and indeed may 
find their proper habitat in the littoral or intertidal zone. The most familiar instance of 
the last sort is the abundant Flustrella hispida, which occurs in great profusion upon the 
rockweeds, Fucus and Ascophyllum. Certain other species, likewise, such as Eucratea 
chelata, Amathia dichotoma, and Bugula flabellata, have seldom been encountered by us 
except upon piles. Another species, Membranipora tehuelcha, has only been noted upon 
the floating gulfweed, with which it is borne passively to our waters. This, like so many 
other species having the same habitat, is a southern form which does not properly 
belong to our local fauna. 
Not a single instance has been found among our dredging records of a species of 
this group whose distribution in Vineyard Sound and Buzzards Bay appears to be 
determined by temperature. There dwell, however, within the outlying colder waters 
of the region considered by us, a considerable number of species, most of which repre- 
sent a strictly northern fauna, and many of which, indeed, find in Woods Hole or vicinity 
their southern limit of distribution. A number of these have not previously been re- 
corded south of Canada. A list of those species is presented, herewith, which have been 
taken by us at Crab Ledge or in the vicinity of Nantucket, but not within Vineyard 
Sound or Buzzards Bay. Data are included respecting their distribution as heretofore 
known. 
Cnisiaeribranian:. .2 224-65 422: Canada. 
Stomatopora diastoporoides .... British Isles, Baffins Bay, Gulf of St. Lawrence. 
Tubulipora atlantica.......,....North Atlantic from Labiador to Florida; Australia. 
Tubulipora flabellaris.......... Northern Atlantic and Arctic seas; Greenland, Gulf of St. Lawrence, 
Grand Manan; Mediterranean ? 
Gemellaria loricata..............Northern Atlantic and Arctic seas; Labrador, St. Georges Banks, Grand 
Manan. 
