BIOLOGICAL SURVEY OF WOODS HOLE AND VICINITY. 123 
Northern types taken only at Crab Ledge. 
Ammotrypane mebrata.! ee eee. Gulf of Maine to Vineyard Sound. 
Atnpiitenignenmertan ys crt.) iece sla ella vale es Northern Europe to Crab Ledge. 
Chetinopoma greenlandica......................Northern seas, south in deep water to Massachusetts. 
Bia Oat EUR ey cn ots slo a isk wis aia 8 eae > Greenland to Vineyard Sound. 
LOM eye cS THE SEC) Ss RS North Atlantic, south to Nantucket; off Sankaty Head. 
Glycera capitata. 2.) 2.6... est... 2... o........ Northern Europe to Crab Ledge. 
Nothriaiconehivlemia ly) 92. Uae a es 8 North Atlantic, south to Cape Cod. 
Myxicola steenstrupii...........................North Atlantic, south to Massachusetts. 
TRCN CAME MMNALUIS 2 6) o)< 2.4 a: wlets visu ae pie tierce + North Atlantic, south to Massachusetts. 
The low temperature of the bottom waters at Crab Ledge was considered on p. 51 
and has been referred to elsewhere in our discussions of distribution. 
Attention has already been called to the fact that a number of our charted species 
of annelids are recorded primarily from the inshore (adlittoral) stations, both in the Bay 
and in the Sound. This is true of Pista palmata, Pista intermedia, Parasabella microph- 
thalmia, and in a lesser degree of Platynereis megalops. The same phenomenon is 
exhibited by certain less common species, such as Sthenelais picta and Dodecaceria coralii. 
_ All of these species were recorded wholly or chiefly from the Phalarope and Blue Wing 
stations. 
On the other hand, certain species appear at first sight to show a tendency exactly 
the opposite of that manifested by those just mentioned. These others were encoun- 
tered with considerable frequency during the Fish Hawk dredging, but were seldom 
taken by the Phalarope. Examples of such species are Eulalia annulata, Nephthys 
bucera, Ninoé nigripes, Arabella opalina, and Rhynchobolus americanus. As a matter 
of fact, however, the last two species, at least, are known to be common along shore, 
where they may be dug up with the spade. Their absence from the Phalarope records 
is very probably due to the failure of the dredges employed on the latter vessel to cut 
deeply enough into the bottom. Indeed, it is quite possible that this same explana- 
tion will hold for most of the cases in which species of Annulata seem to be restricted 
to the Fish Hawk stations. 
And, in general, when we are considering any case in which a given species has 
been obtained almost exclusively by one or the other vessel, the question must be asked 
whether the personal element may not have played a part in determining this result. 
It has been stated that the Fish Hawk and Phalarope dredgings were under the super- 
vision of different persons. As is well known, different observers see different things, 
depending upon what has especially been brought to their notice. We do not believe 
however, that much importance need be attached to this source of error in considering 
most of the species which have been listed here. In the case of certain of those which 
have been mentioned as having a predominantly adlittoral habitat (e. g., Pista inter- 
media), it is noteworthy that even the Fish Hawk stations at which they were taken 
were mainly near shore. 
A considerable number of the Annulata, the names of which appear in our faunal 
catalogue, are strictly intertidal in their habitat, or at least are confined to the shallow 
waters just below the tidal limits. Such forms have naturally not been taken with the 
dredge, although many of them are common enough in their proper habitat. Examples 
of species such as these are Podarke obscura, Nereis limbata, Scoloplos fragilis, Amphr- 
trite ornata, Notomastus luridus, Arenicola cristata, Arenicola marina, Spirorbis spirorbis, 
