
PF sy amo ON a Yn a es VAT 

360 THE ZOOLOGIST. 
Isotomines in our own islands. These are Agrenia bidenticulata 
(Tullb.), a species both Arctic and Alpine, discovered last year in 
Irish and North British mountain streams, and Prozsotoma Beselsw 
(Packard), which inhabits the Arctic Regions of both the Old and 
New Worlds and the coast of Scotland. “ Bi-polarity” in the 
Collembola is shown by Wahlgren’s recent record of this latter species 
from Terra del Fuego and by the presence of a closely allied form 
(Proisotoma Brucei, Carp.) on the South Orkneys. Such distribution 
indicates a high antiquity (probably Mesozoic) for the species. A 
similar conclusion is suggested by a comparison of the distinctively 
Antarctic Springtails. Several genera are apparently confined to the 
southern regions. Among these Cryptopygus (Willem) is represented 
by identical or nearly allied species in Terra del Fuego, Graham Land, 
South Shetland, South Orkneys, and South Georgia. Turning to 
genera of wider range we find the same Isotoma (I. octo-oculata, 
Willem) present in Graham Land, South Shetland, South Orkneys, 
and Kerguelen, while the Isotoma of South Victoria Land (J. klovstadi, 
Carp.) is closely allied to a Fuegian species. Such distributional 
facts suggest a considerable geological age for the species and a 
former wide extension of the Antarctic Continent. The National 
Antarctic ‘Discovery’ Expedition collected from moss at Granite 
Harbour, South Victoria Land, a remarkable Springtail, referable to 
the Poduride, but showing some striking affinities to the [sotomne. 
This insect—apparently the most southerly terrestrial animal yet 
known—will be described and figured in the forthcoming part of the 
Expedition Reports. 
“The Migratory Movements of certain Shore-Birds as observed 
on the Dublin Coast’’ were described by Mr. C. J. Patten. ‘ While 
the majority of my observations, extending over twenty years, on the 
migratory movements of shore-birds along the Dublin coast have 
been incorporated in my work entitled ‘The Aquatic Birds of Great 
Britain and Ireland,’ published at the end of the year 1906, I still 
continue to visit my former hunting-grounds, and, with the aid of 
trustworthy correspondents, have collected further information on 
the subject. To add to my personal observations and to enable me 
to bring before the meeting of the British Association information as 
recent as possible, I selected the Dublin coast this autumn as a sea- 
side resort. I would refer particularly to the Sanderling (Calidris 
arenaria). There is now strong evidence to show that this bird is 
found in adult plumage throughout the breeding-season on that coast. 
The observations of Mr. A. Williams, made in July, 1906, in this 
locality, on the Sanderling are of interest, as there was an unusually 
large gathering of adult birds recorded. In many ways the Turn- 
stone repeats the migratory movements of the Sanderling, and is 
found throughout the year on the Dublin coast in adult plumage. I 
have, moreover, dissected the genitals of the female bird, shot at the 
height of the breeding-season, and have found quite ripe ova. The 
time will, I believe, yet come when this species will be discovered 
breeding on the Irish sea-board, or perhaps along the shores of inland 
lakes.” 
