3 1893.] Bacterial Flora of the Atlantic. 415 
__ This confirms the work of other observers and shows that 
_marine-organisms are likewise susceptible ina high degree 
_ tothe direct rays of solar light and that ina vegetative con- 
_ ition, they are easily destroyed in this way. 
Distribution, of species. 
The distribution of species may be considered in two ways: 
t, as to area covered or superficial distribution; second, as 
todepth or bathymetrical range. The region examined at 
Woods Holl covered a larger area than at Naples, but the op- 
portunity for determining the bathymetrical range was unfa- 
ag owing to the extreme shallowness of the sea at this 
place, 
The observations this season cover rather more than 100 
“tare miles of the region of Buzzard’s Bay and Vineyard 
_ ‘ound. The water forms were found to be distributed through- 
- Out the water masses very generally, as was likewise the case 
— With those Species indigenous to the mud. 
Through the kindness of Prof. Wm. Libbey, Jr., opportu- 
_ Mtywas offered for the collection of material from the sea bottom 
at Was secured by him on board of the U. S. Fish Commission 
_ “hooner Grampus, at a distance of one hundred miles from 
_itinland (New Bedford). The mud, consisting of globigerina 
_-‘Mte, was taken at the depth of 450" on the edge of the great 
cttal platform that skirts the eastern coast of the 
| ne ed States. Only two samples were collected, but these 
a ted to show that two of the more common mud forms that 
' tinheg be found nearer the shore were also inhabitants of this 
) 2 “ This instance, although isolated, suffices to show 
= € forms found in the mud are not locally distributed, 
~e Spread over a considerable extent of the sea bottom. 
ie. Point is more strongly brought out when we compare 
j eben flora of this side of the Atlantic with that of — 
kent of fo: Bacillus limosus was one of the most aide! 
Sand: mud forms that was isolated in Mediterranean v a 
ts this same species has been identified by compariso 
. cultures brought from. Naples with a form that is a 
 s 
state land. Its presence at these three isolated locali- 
€s that its distribution is very general in the Atlan- 
