350 
BULLETIN OF THE BUREAU OF FISHERIES 
United States have not been mentioned by the authors and express the belief that 
it occurs at Woods Hole. The indications are that this barnacle is a southern form. 
Ordinarily, Balanus improvisus has been found attached to floating wood, shells, 
etc. In the Chesapeake it has been taken at areas where the depths ranged from 10 
to 46 meters; and in other parts of the world, according to Gravel (1905, p. 231), it 
has been found from the level of low tide to 35 or 40 meters. 
Judging from the literature, Balanus improvisus is not commonly found along 
the coast of the United States, but it seems quite probable that further investigation 
will show it to be much more abundant than the records indicate at the present time. 
Balanus eburneus is a species which is generally recognized as a brackish-water 
form. It was originally described by Gould (1841) from Salem, Mass., and is known 
to occur in other places along the coast of the United States. According to Gruvel 
(1905, p. 234) it has been found on the coast of Honduras, Venezuela, Jamaica, and 
Trinidad. In Chesapeake Bay it was collected near the mouth of the Potomac 
River at areas Q and 0 where the bottom salinity was 20.58 and 20.91 per mille, respec- 
tively. The depths at these areas were 15 and 8 meters. This species seems to be a 
southern form. 
It is evident from our records that barnacles occur well up in Chesapeake Bay, 
but shore collecting undertaken by the writer has shown that there is at least one 
species still unidentified which is quite abundant on piles and other objects and that 
it flourishes as far up Chesapeake Bay as the mouth of the Patapsco River and 
probably farther. In this region the salinity may fall so low during the spring months 
that the water is almost fresh. 
AMPHIPODA 
The species of amphipods which are listed below represent the catch made during 
a single cruise, that of May, 1920. These have been identified by C. R. Shoemaker, 
of the division of marine invertebrates of the National Museum. A considerable 
amount of material collected on other cruises still awaits study so that undoubtedly 
more species will come to light when this is done. However, it has been the experi- 
ence of those who undertook the survey of the Woods Hole region that in Buzzards 
Bay, which is a body of water much like Chesapeake Bay, the collections of bottom- 
dwelling amphipods showed a paucity of species as compared with Vineyard Sound 
(Sumner, Osburn, and Cole, 1913, p. 132). 
The following is a list of the species: Monoculodes edwardsi Holmes, Stenothoe 
cypris Holmes, Batea catharinensis Muller, Leptocheirus species (new), Ericthonius 
brasiliensis (Dana), Corophium cylindricum (Say), Cerapus tubularis Say, Paraca- 
prella simplex Mayer and Caprella acutifrons Latreille. 
But little can be said of the relation of distribution to salinity, temperature, 
depth, season, or latitude at this time. However, the new species of Leptocheirus 
was found off Sandy Point, Md., where the bottom salinity was 5.76 per mille, and 
none of the rest of the species so far as we have records was taken at areas where the 
bottom salinity exceeded 21.00 per mille. These low salinities are accounted for by 
the fact that all of the specimens collected came from areas where the depths did 
not exceed 14 meters — in other words, from shallow water areas. 
Monoculodes edwardsi was found at areas L' and K’ not far from the mouth of 
the Potomac River. The bottom salinity at the first area was 13.09 per mille, and 
at the last 9.42 per mille. This species, ivhich was described by Holmes (1905, p.487) 
from a specimen found at Woods Hole, Mass., was spoken of by him (1903, p.275) 
as having a distribution from Cape Cod to Cape Hatteras. 
