184 BULLETIN OF THE BUREAU OF FISHERIES. 
and to what degree they are due to geographical isolation we can not say. The surface 
temperature of the sea in the neighborhood of Plymouth is said to range from about 
44° F. (February) to about 59° F. (August). (See Dickson, 1892, p. 276.) In this 
respect the conditions are far different from those in Vineyard Sound, in which the 
annual range of temperature is roughly from 30° F., or less, to 70°. On the other hand, 
we know that broad expanses of ocean are effective barriers to distribution, even for 
marine organisms. 
Although we have not undertaken the ambitious task of making extended com- 
parisons between the Woods Hole fauna and the faunas of other sections of the Atlantic 
coast, we have nevertheless been able to give some answer to the questions: (1) Have 
the majority of our more representative species a range which is predominantly north- 
ward or one which is predominantly southward? (2) In how large a degree is Cape 
Cod a barrier to distribution? 
As stated above, we have considered for this purpose only those species which have 
been taken at ro or more of our dredging stations, and which, therefore, may be regarded 
as those which are most truly representative of our local benthos. Of such species there 
are 202, excluding 9 species of Protozoa. In the various sections of chapter Iv these 
species have been grouped according to their range upon our coast, and a synopsis of 
these separate lists is presented in a table herewith. It may be repeated that a species 
has been regarded as predominantly northward-ranging, whose range (in latitude) to 
the northward on our coast is at least twice as great as its range to the southward.¢ 
A species has been regarded as southward-ranging which presents the converse type of 
distribution. The column headed ‘‘Equal’’ refers to those species whose known range 
in one direction does not greatly exceed the known range in the other direction; while 
the doubtful column includes those concerning which our data are insufficient. In many 
cases they have been found only in the immediate vicinity of Woods Hole. 
ae pists 
own | to occur 
pee can Equal. ania Total. Lagat ae of 
northern.| southern. 4 Cape Cod.| Hole 
region.> 
Spore ¥e% Figs de getnataL Sao DORI eco lonO a nOOMeL OOO Io I I T lek oder 3 2 2 
Roclenterates are aoe cites eels asisieinrslaesiasierraeae: 6 3 2 2 13 II 9 
RCV OZOMS See tact e cre ierate peter ororatata are taretaiarstere clerevsice. dete oie steve 4 4 7 6 ai I2 II 
BchiwioGd ers ei. isa; Nos eh leloprsela sie ee sees Selly dea rls 3 Ch ee 2 7 6 7 
PAU IECEN aie BBRCS Tone HOO top dObe DORRIT! aa oOmeerens 5 22 2 I 30 13 27 
Sipe ri atcha orca eicis ciate, otaiaks love atatarsfatatcs ovata !ata/a)oys/tinleloreholerove rails pla sielsjoSeia‘al i stnaspatetal=tats Dal etic coreates I I I 
Girripedtane interes teas cence cet mitts /acstatnvclsleretalctarel| move oraterereiers Tol earereeereey omiceraidiere 6 I < I 
Hr: SruFojri}ovi00 Caren ee OTS OOM, Toon rae Onne PEIacOCD MOO oD 7 Kol eeess donk 7 19 8g 6 
MOAT FIO. AGE O MEDO DAOC OD scone HOSEE. noth CD ot Dad Hal (TAO ONS OaF 2 Sil ceor leo xi a I =| 
1D Gass i a eee OEE Ree em Hnma eared Locode bce 2 8 SBM. 2 Grays, a 13 8 13 
PR CHOPOUIGGS) oo apse os oc Riate ees a arstale are se cveatoronratane Wate elelalfieve neelahs, o's Sale Ae os oA I 2 I I 
Meollnsles is 228 Saistaiccs visto dear Sarasin oe sete Oe 16 43 8 I 68 50 67 
HEUTE ae Rt pe EO REE ONE PRE Se NOT htt ot Oko mca OF Al \arayasisinwelexess 4 8 3 5 
TST GS re ete one aia veoacaVes coral Ste, Ustvese, aa pr alaStsr ate a) ate maarstorataysts 2 5 Gales ners sec 13 13 12 
1 eye ES be ee aS ARE CEES Ore 46 IOI 31 24 202 130 165 
a This criterion has not been applied to those cases in which it is definitely known that the extreme southern records relate 
only to great depths. 
b Long Island Sound has not been regarded as south of the Woods Hole region. Had it been so considered, the figures in 
this column would have been materially increased. 
