140 BULLETIN OF THE BUREAU OF FISHERIES. 
of general distribution. These types will be considered separately. The ranges here 
stated have been furnished by Miss Rathbun. 
Species found predominantly in the colder waters. 
Pagurus acadianus..............From the Grand Bank of Newfoundland to the mouth of Chesapeake 
Bay. 
Cancerborealis yaa. . enieie:. «fie le Nova Scotia to deep water off South Carolina. 
Considering the range in latitude alone, it is questionable whether we may fairly 
assign either of these species to the ‘‘northern” group. In both cases, however, it is 
possible that their occurrence in southern waters is restricted to considerable depths. 
Two other species (not plotted) which were taken by us only at the open ends of 
Vineyard Sound and Buzzards Bay and at Crab Ledge are Hyas coarciatus and Pandalus 
leptocerus. ‘These may, perhaps, be regarded as predominantly northern species, though 
they are recorded (depth not stated) for points far to the southward on our coast. 
Species which seem to avoid the colder waters, though elsewhere of general occurrence. 
Papiirus atinglipest 0.5 ksi... Nantucket Sound to Indian River, Fla. 
Pelia mutica. jock “cele i; Vineyard Sound to West Florida. 
Neopanope texana sayi......... Provincetown to East Florida. 
Another species, Pagurus pollicaris, might perhaps be added to this list. This 
hermit crab, it will be seen, was not recorded from the stations at the extreme western 
end of Vineyard Sound, though elsewhere prevalent. The case is not so striking, how- 
ever, as those mentioned previously. The range of this latter species is said to extend 
from Cape Cod Bay to South Carolina. 
’ None of these four species are recorded by us from Crab Ledge. All show, or appear 
to show, an avoidance of the coldest waters of Vineyard Sound, and ali are predomi- 
nantly southern in their distribution upon our coast. It seems quite likely, therefore, 
that temperature has been the factor responsible for the peculiarities in their local 
distribution. 
Mention may appropriately be made here of certain species from southern waters 
which do not properly belong to our local fauna at all. Among these are four crabs 
(Planes minutus, Portunus sayi, Portunus ordwayi, and Areneus cribrarius) and two 
shrimps (Peneus brasiliensis and Latreutes ensijerus). In nearly all cases these species 
have been found upon the floating gulfweed (Sargassum bacciferum), which is the home 
of so many waifs from the far south. 
On the other hand, several shrimps of the genus Spirontocaris, which are known to 
be representatives of a northern fauna, have only been taken from the outlying colder 
waters of the region. 
Very few species among those dredged by us showed any evident restrictions as to 
depth. This statement does not hold, however, for Ovalipes ocellatus, Cancer borealis, 
and Pagurus acadianus. All of these were dredged most frequently at depths of 10 
fathoms or more, despite the comparatively small number of dredging stations at which 
such depths were recorded. Ovalipes, as we have seen, is by no means to be regarded 
as a deep-water crab, since it is known to be common on sand flats in shallow water. 
The greater average depth of the stations from which it was recorded results from its 
