BIOLOGICAL SURVEY OF WOODS HOLE AND VICINITY. 135 
The 19 commonest species of amphipods are herewith grouped with reference to their 
known range upon our coast. The ranges stated are those given by Holmes (1905). 
Northward. ranging. 
Ampelisca macrocephala....... Off Halifax to Newport. 
Calliopius leviusculus......... Greenland to Narragansett Bay. 
Pontogenia inermis.............Arctic Ocean to Vineyard Sound. 
Ptilocheirus pinguis............ Labrador to New England. 
Amphithoé rubricata.......... Labrador to Newport. 
Pipetesto) Ett r6) 52): ae ee Greenland to New Jersey. 
Aiginella longicornis........... Greenland to Narragansett Bay. 
Southward ranging. 
?Haustorius arenarius...........Cape Cod to Georgia, Norway, British Isles. 
Elasmopus levis. <...... 06/025. Provincetown, Mass., to New Jersey. 
Eriethouis minax ys... ./05(s 2 Vineyard Sound to Great Egg Harbor, N. J. 
Corophium cylindricum....... Provincetown, Mass., to New Jersey. 
Caprella geometrica.............Southern coast of New England to Virginia. 
Of uncertain position. 
Lysianopsis alba................Woods Hole. 
Ampelisca spinipes............ Long Island Sound, Woods Hole. (Norway.) 
WemrMis|settatas ose. es ee om sds Woods Hole, Newport. 
Pea SECUNGAI sso esky. fs. Woods Hole. 
Gammarus annulatus...........Vineyard Sound, Gloucester. 
Autonoé smithi.................Vineyard Sound and Buzzards Bay. 
Jassa marmorata................Woods Hole region. 
Thus there seems to be a slight excess of northern over southern species among 
those 19 amphipods which we have dredged most frequently. Little importance is to 
be attributed to this fact, however, in considering which element is preponderant in 
our fauna, particularly since for more than one-third of these commoner species the 
range is not known with any degree of completeness. 
VI. ISOPODA. 
This order is represented in the local fauna by 25 or more species, of which 1o 
were recorded from our dredging stations and at least 7 more were taken by col- 
lectors from the laboratory during the progress of the Survey. One of these (Erich- 
sonella attenuata) is here recorded for the first time for this region. 
Our knowledge of this group in New England waters is due chiefly to the labors 
of O. Harger and Dr. Harriet Richardson. To the latter authority we are indebted 
for the identification of some of our earlier specimens, though the greater part of the 
material was determined by Dr. Osburn. The nomenclature employed by Miss Rich- 
ardson has been adopted by us without modification. 
Twenty-one species of isopods were listed by Harger in the “Invertebrate Animals 
of Vineyard Sound,” of which only a small proportion were at that time recorded for 
definitely stated points within the limits of the region. In a later paper (1880) the 
group was treated much more fully by this writer. 
